Circuit/System Testing

WARNING: This page is about a different car, the 2015 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.

B1516 08

Ignition OFF, disconnect the harness connector at the B18 battery current sensor.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 min. Test for less than 30 Ω between the low reference circuit terminal B and ground.
- If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
- If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
- If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal C and ground.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
If all circuits test normal, test or replace the B18 Battery Current Sensor.

B1516 66

Verify that the B18 Battery Current Sensor is installed securely around the negative battery cable, with the tape tab pointing away from the negative terminal on the C1 Battery.
- If the B18 Battery Current Sensor is not installed correctly, remove and reinstall the sensor properly.
Replace the B18 Battery Current Sensor.