BCM Power Circuit and Ground Circuit Check

BCM Power Circuit and Ground Circuit Check

Wiring Diagram










Troubleshooting

1. Fuse check

Turn ignition switch to OFF position.
Check circuit fuses for condition.

Are circuit fuses in good condition?
YES -
Go to Step 2.
NO -
Replace fuse and check for short circuit to ground.

2. Power supply circuit check

Disconnect connectors from BCM.
Check for proper connection to BCM connector at terminal "G32-13".
If OK, then measure voltage between "G32-13" terminal of BCM and vehicle body ground.

Is voltage 10 - 14 V?
YES -
Go to Step 3.
NO -
Repair power supply circuit.

3. Power supply circuit check

Check for proper connection to BCM connector at terminals "G30-1" and "G30-2".
If OK, turn ignition switch ON.
Measure voltage between following terminals.
- Between "G30-1" terminal of BCM connector and vehicle body ground
- Between "G30-2" terminal of BCM connector and vehicle body ground

Is each voltage 10 - 14 V?
YES -
Go to Step 4.
NO -
Repair power supply circuit.

4. Ground circuit check

Turn ignition switch to OFF position.
Check for proper connection to BCM connector at terminals "G30-12" and "G32-1".
If OK, then measure resistance between following terminals.
- Between "G30-12" terminal of BCM connector and vehicle body ground
- Between "G32-1" terminal of BCM connector and vehicle body ground

Is each resistance 2 ohms or less?
YES -
BCM power supply circuit and ground circuit are in good condition.
NO -
Repair ground circuit.