Schematic Reference
* Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, headlamps and all accessories OFF, observe the scan tool BCM Battery Current parameter. The reading should be between -5 amps and
-25 amps, and change with the amount of current draw on the battery.
Circuit/System Testing
1. Ignition ON, observe the scan tool BCM Battery Voltage parameter. The reading should be equal to B+ voltage.
锟斤拷 If not the specified value, test the following BCM circuits for an open/high resistance. If the circuits test normal, replace the BCM.
* B+ circuit terminal 3 X3
* Ground circuit terminal 1 X3
* Ground circuit terminal 5 X3
* Ground circuit terminal 9 X4
2. Verify that the current sensor is mounted correctly on the negative battery cables. The sensor should be installed with the internal coil around
the negative battery cables, with the tape tab pointing away from the battery.
锟斤拷 If the sensor is not installed correctly, remove and reinstall the sensor.
3. Ignition OFF, disconnect the harness connector at the battery current sensor.
4. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the low
reference circuit terminal B and ground.
锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
5. Ignition ON, test for 4.5-5.5 volts between the 5-volt reference circuit terminal A and ground.
锟斤拷 If not within the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the BCM.
6. Ignition ON, test for 4.5-5.5 volts between the signal circuit terminal C and ground.
锟斤拷 If not within the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
7. If all circuits test normal, replace the battery current sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Battery Current Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Battery Current Sensor/Service and
