2010 Cadillac Truck SRX AWD V6-3.0L Page 315
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X1 harness connector K9 BCM
4. Ignition OFF, disconnect the inline harness connector listed below:
* E4C daytime running lamp - left X111 inline harness connector
* E4D daytime running lamp - right X116 inline harness connector
5. Connect a test lamp between the control circuit terminal G and ground.
6. Command the appropriate Dedicated Daytime Running Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when
changing between the commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace
the K9 BCM.
7. If all circuits test normal, replace the daytime running lamp bulb.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Daytime Running Lamp Bulb Replacement (TT6,TT7,TT8 Passenger Side Headlamp) (See: Lighting and Horns/Daytime Running
Lamp/Service and Repair/Daytime Running Lamp Bulb Replacement (TT6,TT7,TT8 Passenger Side Headlamp))Daytime Running Lamp
Bulb Replacement (T84, T85 Passenger Side Headlamp) (See: Lighting and Horns/Daytime Running Lamp/Service and Repair/Daytime
Running Lamp Bulb Replacement (T84, T85 Passenger Side Headlamp))Daytime Running Lamp Bulb Replacement (T84, T85 Driver Side
Headlamp) (See: Lighting and Horns/Daytime Running Lamp/Service and Repair/Daytime Running Lamp Bulb Replacement (T84, T85
Driver Side Headlamp))Daytime Running Lamp Bulb Replacement (TT6,TT7,TT8 Driver Side Headlamp) (See: Lighting and
Horns/Daytime Running Lamp/Service and Repair/Daytime Running Lamp Bulb Replacement (TT6,TT7,TT8 Driver Side Headlamp))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B270A
DTC B270A
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 Descriptor
DTC B270A 01
- Park Lock Solenoid Control Circuit Short to Voltage
DTC B270A 02
- Park Lock Solenoid Control Circuit Short to Ground
DTC B270A 04
- Park Lock Solenoid Control Circuit Open
Diagnostic Fault Information
Circuit/System Description
The body control module controls the automatic transmission park lock control solenoid by providing a battery positive voltage to the solenoid. The
body control module controls the voltage supply circuit to the automatic transmission park lock control solenoid. The BCM monitors the voltage
