2010 Cadillac Truck Escalade RWD V8-6.2L Page 1501
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disconnect the X1 harness connector at the drive motor generator power inverter module assembly.
2. Ignition ON, verify that the scan tool Contactor System Request Circuit Command parameter is 100 percent.
瀚慖f not the specified value, test the control circuit terminal 4 for a short to ground. If the circuit tests normal, replace the Battery Energy
Control Module and Bracket Replacement ().
3. Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. Verify that the scan tool Contactor System Request Circuit
Command parameter is 0 percent.
瀚慖f not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the
drive motor generator battery control module.
4. If all circuits test normal, replace the drive motor generator power inverter module assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module, drive
motor generator power inverter control module replacement, setup, and programming
P1AE6
DTC P1AE6 or P1AE7
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P1AE6
- Battery Energy Control Module Hybrid Battery Voltage Isolation Sensor Circuit
DTC P1AE7
- Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost
Circuit/System Description
The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator
battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is
communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The
hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.
The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the high voltage isolation circuit is to test the resistance
between the high voltage positive and negative direct current (DC) bus and chassis ground. The drive motor generator battery control module only
runs this test when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. The drive motor generator battery
control module has an internal isolation sensor that measures the resistance between the high voltage DC positive and negative bus and chassis
ground. The drive motor generator battery control module runs an internal self check of this sensor circuit. If the internal self check fails DTC
P1AE6 will set. The drive motor generator battery control module sends an AC signal over the DC bus and monitors its amplitude. A low amplitude
or collapsed return signal indicates a loss of resistance to chassis ground and a loss of isolation will be indicated by the drive motor generator
battery control module. This DTC indicates that the fault is in the drive motor generator battery. Because this diagnostic runs after system power
down, the diagnostic status does not get reported until the next key cycle.
Conditions for Running the DTC
* Ignition voltage is 9-18 V.
* The ignition switch transitions from ON to OFF.
* High voltage contactor transitions to open.
Showing posts with label not.. Show all posts
Showing posts with label not.. Show all posts
Tuesday, June 9, 2020
Tuesday, June 2, 2020
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1329
2010 Cadillac Truck Escalade RWD V8-6.2L Page 1329
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
瀚慖f not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
瀚慖f not within the specified range, replace the drive motor battery assembly.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P0B64
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,
P0B91, P0B96, or P0B9B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0B3C
- Hybrid Battery 1 Circuit Performance
DTC P0B41
- Hybrid Battery 2 Circuit Performance
DTC P0B46
- Hybrid Battery 3 Circuit Performance
DTC P0B4B
- Hybrid Battery 4 Circuit Performance
DTC P0B50
- Hybrid Battery 5 Circuit Performance
DTC P0B55
- Hybrid Battery 6 Circuit Performance
DTC P0B5A
- Hybrid Battery 7 Circuit Performance
DTC P0B5F
- Hybrid Battery 8 Circuit Performance
DTC P0B64
- Hybrid Battery 9 Circuit Performance
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
瀚慖f not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
瀚慖f not within the specified range, replace the drive motor battery assembly.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P0B64
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,
P0B91, P0B96, or P0B9B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0B3C
- Hybrid Battery 1 Circuit Performance
DTC P0B41
- Hybrid Battery 2 Circuit Performance
DTC P0B46
- Hybrid Battery 3 Circuit Performance
DTC P0B4B
- Hybrid Battery 4 Circuit Performance
DTC P0B50
- Hybrid Battery 5 Circuit Performance
DTC P0B55
- Hybrid Battery 6 Circuit Performance
DTC P0B5A
- Hybrid Battery 7 Circuit Performance
DTC P0B5F
- Hybrid Battery 8 Circuit Performance
DTC P0B64
- Hybrid Battery 9 Circuit Performance
Thursday, March 12, 2020
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3009
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3009
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
Note: Use the schematic to identify the following:
* Control modules the vehicle is equipped with
* Control module locations on the low and high speed GMLAN serial data circuits
* The control modules B+, ignition, ground, communication enable and serial data circuit terminals
1. Determine the control module that is not communicating. Refer to Control Module U Code List (See: Diagnostic Trouble Code
Descriptions/Control Module U Code List).
2. Using the Hybrid High Voltage Module Chart below, verify that the non-communicating control module is not a high voltage module. If the
control module is a high voltage module, perform the High Voltage Disabling (See: Hybrid Drive Systems/Battery System, Hybrid
Drive/Testing and Inspection/Initial Inspection and Diagnostic Overview/High Voltage Disabling) procedure before proceeding with this
diagnostic.
3. If high voltage disabling is required, reconnect the 12 V battery after performing the high voltage disabling procedure.
4. Ignition OFF, disconnect the harness connector of the control module that is not communicating.
5. Test for less than 10 ohm between each ground circuit terminal and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
6. If equipped, verify that a test lamp illuminates between each B+ circuit terminal and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the
control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
7. If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test
the control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
Note: Only the high speed GMLAN modules have a serial data communication enable circuit OR an accessory wakeup serial data circuit,
and the BCM is the output for these circuits. Refer to the module schematics to identify which modules have these circuits.
8. If equipped, ignition ON, verify that a test lamp illuminates between the communication enable circuit terminal OR the accessory wakeup
circuit terminal and ground.
瀚慖f the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuits test normal, replace the BCM.
9. Ignition OFF for 60 seconds, test for less than 5 ohm between the serial data circuit terminals and the appropriate DLC terminal listed below:
* Class 2 serial data circuit terminal 2
* Low speed GMLAN serial data terminal 1
* High speed GMLAN serial data terminal 6 or 14
瀚慖f greater than the specified range, test the serial data circuit for an open/high resistance between the non communicating control module
and a control module setting the DTC or a serial data splice pack.
10. If all circuits test normal, replace the control module that is not communicating.
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
Note: Use the schematic to identify the following:
* Control modules the vehicle is equipped with
* Control module locations on the low and high speed GMLAN serial data circuits
* The control modules B+, ignition, ground, communication enable and serial data circuit terminals
1. Determine the control module that is not communicating. Refer to Control Module U Code List (See: Diagnostic Trouble Code
Descriptions/Control Module U Code List).
2. Using the Hybrid High Voltage Module Chart below, verify that the non-communicating control module is not a high voltage module. If the
control module is a high voltage module, perform the High Voltage Disabling (See: Hybrid Drive Systems/Battery System, Hybrid
Drive/Testing and Inspection/Initial Inspection and Diagnostic Overview/High Voltage Disabling) procedure before proceeding with this
diagnostic.
3. If high voltage disabling is required, reconnect the 12 V battery after performing the high voltage disabling procedure.
4. Ignition OFF, disconnect the harness connector of the control module that is not communicating.
5. Test for less than 10 ohm between each ground circuit terminal and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
6. If equipped, verify that a test lamp illuminates between each B+ circuit terminal and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the
control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
7. If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test
the control circuits of the control module for a short to ground. If the circuits test normal, replace the control module.
Note: Only the high speed GMLAN modules have a serial data communication enable circuit OR an accessory wakeup serial data circuit,
and the BCM is the output for these circuits. Refer to the module schematics to identify which modules have these circuits.
8. If equipped, ignition ON, verify that a test lamp illuminates between the communication enable circuit terminal OR the accessory wakeup
circuit terminal and ground.
瀚慖f the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuits test normal, replace the BCM.
9. Ignition OFF for 60 seconds, test for less than 5 ohm between the serial data circuit terminals and the appropriate DLC terminal listed below:
* Class 2 serial data circuit terminal 2
* Low speed GMLAN serial data terminal 1
* High speed GMLAN serial data terminal 6 or 14
瀚慖f greater than the specified range, test the serial data circuit for an open/high resistance between the non communicating control module
and a control module setting the DTC or a serial data splice pack.
10. If all circuits test normal, replace the control module that is not communicating.
Friday, November 8, 2019
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1430
2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1430
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
瀚慖f not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
瀚慖f not within the specified range, replace the drive motor battery assembly.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P0B64
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,
P0B91, P0B96, or P0B9B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0B3C
- Hybrid Battery 1 Circuit Performance
DTC P0B41
- Hybrid Battery 2 Circuit Performance
DTC P0B46
- Hybrid Battery 3 Circuit Performance
DTC P0B4B
- Hybrid Battery 4 Circuit Performance
DTC P0B50
- Hybrid Battery 5 Circuit Performance
DTC P0B55
- Hybrid Battery 6 Circuit Performance
DTC P0B5A
- Hybrid Battery 7 Circuit Performance
DTC P0B5F
- Hybrid Battery 8 Circuit Performance
DTC P0B64
- Hybrid Battery 9 Circuit Performance
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
瀚慖f not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
瀚慖f not within the specified range, replace the drive motor battery assembly.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P0B64
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,
P0B91, P0B96, or P0B9B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0B3C
- Hybrid Battery 1 Circuit Performance
DTC P0B41
- Hybrid Battery 2 Circuit Performance
DTC P0B46
- Hybrid Battery 3 Circuit Performance
DTC P0B4B
- Hybrid Battery 4 Circuit Performance
DTC P0B50
- Hybrid Battery 5 Circuit Performance
DTC P0B55
- Hybrid Battery 6 Circuit Performance
DTC P0B5A
- Hybrid Battery 7 Circuit Performance
DTC P0B5F
- Hybrid Battery 8 Circuit Performance
DTC P0B64
- Hybrid Battery 9 Circuit Performance
Wednesday, October 30, 2019
2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1602
2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1602
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disconnect the X1 harness connector at the drive motor generator power inverter module assembly.
2. Ignition ON, verify that the scan tool Contactor System Request Circuit Command parameter is 100 percent.
锟斤拷If not the specified value, test the control circuit terminal 4 for a short to ground. If the circuit tests normal, replace the Battery Energy
Control Module and Bracket Replacement ().
3. Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. Verify that the scan tool Contactor System Request Circuit
Command parameter is 0 percent.
锟斤拷If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the
drive motor generator battery control module.
4. If all circuits test normal, replace the drive motor generator power inverter module assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module, drive
motor generator power inverter control module replacement, setup, and programming
P1AE6
DTC P1AE6 or P1AE7
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P1AE6
- Battery Energy Control Module Hybrid Battery Voltage Isolation Sensor Circuit
DTC P1AE7
- Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost
Circuit/System Description
The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator
battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is
communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The
hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.
The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the high voltage isolation circuit is to test the resistance
between the high voltage positive and negative direct current (DC) bus and chassis ground. The drive motor generator battery control module only
runs this test when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. The drive motor generator battery
control module has an internal isolation sensor that measures the resistance between the high voltage DC positive and negative bus and chassis
ground. The drive motor generator battery control module runs an internal self check of this sensor circuit. If the internal self check fails DTC
P1AE6 will set. The drive motor generator battery control module sends an AC signal over the DC bus and monitors its amplitude. A low amplitude
or collapsed return signal indicates a loss of resistance to chassis ground and a loss of isolation will be indicated by the drive motor generator
battery control module. This DTC indicates that the fault is in the drive motor generator battery. Because this diagnostic runs after system power
down, the diagnostic status does not get reported until the next key cycle.
Conditions for Running the DTC
* Ignition voltage is 9-18 V.
* The ignition switch transitions from ON to OFF.
* High voltage contactor transitions to open.
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disconnect the X1 harness connector at the drive motor generator power inverter module assembly.
2. Ignition ON, verify that the scan tool Contactor System Request Circuit Command parameter is 100 percent.
锟斤拷If not the specified value, test the control circuit terminal 4 for a short to ground. If the circuit tests normal, replace the Battery Energy
Control Module and Bracket Replacement ().
3. Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. Verify that the scan tool Contactor System Request Circuit
Command parameter is 0 percent.
锟斤拷If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the
drive motor generator battery control module.
4. If all circuits test normal, replace the drive motor generator power inverter module assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module, drive
motor generator power inverter control module replacement, setup, and programming
P1AE6
DTC P1AE6 or P1AE7
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P1AE6
- Battery Energy Control Module Hybrid Battery Voltage Isolation Sensor Circuit
DTC P1AE7
- Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost
Circuit/System Description
The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator
battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is
communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The
hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.
The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the high voltage isolation circuit is to test the resistance
between the high voltage positive and negative direct current (DC) bus and chassis ground. The drive motor generator battery control module only
runs this test when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. The drive motor generator battery
control module has an internal isolation sensor that measures the resistance between the high voltage DC positive and negative bus and chassis
ground. The drive motor generator battery control module runs an internal self check of this sensor circuit. If the internal self check fails DTC
P1AE6 will set. The drive motor generator battery control module sends an AC signal over the DC bus and monitors its amplitude. A low amplitude
or collapsed return signal indicates a loss of resistance to chassis ground and a loss of isolation will be indicated by the drive motor generator
battery control module. This DTC indicates that the fault is in the drive motor generator battery. Because this diagnostic runs after system power
down, the diagnostic status does not get reported until the next key cycle.
Conditions for Running the DTC
* Ignition voltage is 9-18 V.
* The ignition switch transitions from ON to OFF.
* High voltage contactor transitions to open.
Monday, October 28, 2019
2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1430
2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1430
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
锟斤拷If not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
锟斤拷If not within the specified range, replace the drive motor battery assembly.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P0B64
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,
P0B91, P0B96, or P0B9B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0B3C
- Hybrid Battery 1 Circuit Performance
DTC P0B41
- Hybrid Battery 2 Circuit Performance
DTC P0B46
- Hybrid Battery 3 Circuit Performance
DTC P0B4B
- Hybrid Battery 4 Circuit Performance
DTC P0B50
- Hybrid Battery 5 Circuit Performance
DTC P0B55
- Hybrid Battery 6 Circuit Performance
DTC P0B5A
- Hybrid Battery 7 Circuit Performance
DTC P0B5F
- Hybrid Battery 8 Circuit Performance
DTC P0B64
- Hybrid Battery 9 Circuit Performance
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Disconnect the X4 harness connector at the drive motor battery control module.
3. Connect the EL-48571 high voltage battery pin out box.
4. Install the high voltage manual disconnect lever. Measure and record each of the 20 battery voltages.
5. Each battery voltage reading should be between 10-19 V.
锟斤拷If not within the specified range, replace the drive motor battery assembly.
6. Each battery voltage reading should be within 1.5 V of each other.
锟斤拷If not within the specified range, replace the drive motor battery assembly.
7. If all circuits test normal, replace the drive motor generator battery control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Drive Motor Generator Battery Replacement and Shipping Preparation ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control module
replacement, setup and programming
P0B64
DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C,
P0B91, P0B96, or P0B9B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0B3C
- Hybrid Battery 1 Circuit Performance
DTC P0B41
- Hybrid Battery 2 Circuit Performance
DTC P0B46
- Hybrid Battery 3 Circuit Performance
DTC P0B4B
- Hybrid Battery 4 Circuit Performance
DTC P0B50
- Hybrid Battery 5 Circuit Performance
DTC P0B55
- Hybrid Battery 6 Circuit Performance
DTC P0B5A
- Hybrid Battery 7 Circuit Performance
DTC P0B5F
- Hybrid Battery 8 Circuit Performance
DTC P0B64
- Hybrid Battery 9 Circuit Performance
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