Diagnostic Routine R

Diagnostic Routine R

Diagnostic Overview

U1007

Refer to Wiring Diagram Set 12 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The battery monitoring sensor is attached to the negative battery cable. It is supplied battery voltage by the BJB (Battery Junction Box). It communicates battery conditions to the BCM (Body Control Module) through a dedicated LIN (Local Interconnect Network) circuit.

DTC (Diagnostic Trouble Code) Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Inspect the battery monitoring sensor.

- Inspect the BJB (Battery Junction Box) fuse 22 (15A).

Pinpoint Test

NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.

NOTE: Do not have a battery charger attached during vehicle testing.

1. RETRIEVE BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, perform BCM (Body Control Module) self-test.

Is DTC (Diagnostic Trouble Code) B1131:83 or B1131:87 present?






2. CHECK THE BATTERY MONITORING SENSOR VOLTAGE

1. Ignition OFF.

2. Disconnect: Battery Monitoring Sensor.

3. Measure and record battery voltage.

4. Measure:





Is the voltage within 0.5 volt of the recorded battery voltage?






3. CHECK THE BATTERY MONITORING SENSOR LIN (Local Interconnect Network) CIRCUIT FOR A SHORT TO VOLTAGE

1. Disconnect: BCM (Body Control Module) C2280A.

2. Disconnect: LH (Left Hand) Windshield Wiper Motor.

3. Ignition ON.

4. Measure:





Is any voltage present?






4. CHECK THE BATTERY MONITORING SENSOR LIN (Local Interconnect Network) CIRCUIT FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Is the resistance greater than 10,000 ohms?






5. CHECK THE BATTERY MONITORING SENSOR LIN (Local Interconnect Network) CIRCUIT FOR AN OPEN

1. Measure:









Are the resistances less than 3 ohms?