BCM Branch Line Circuit Check

BCM Branch Line Circuit Check

1. CHECK CONNECTOR

1 Turn the ignition switch OFF.
2 Disconnect the battery cable from the negative terminal.
3 Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side).

Is the inspection result normal?
YES
GO TO 2.
NO
Repair the terminal and connector.

2. CHECK HARNESS FOR OPEN CIRCUIT

1 Disconnect the connector of BCM.
2 Check the resistance between the BCM harness connector terminals.






Is the measurement value within the specification?
YES
GO TO 3.
NO
Repair the BCM branch line.

3. CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the BCM. Refer to [Power Supply and Ground Circuit Check] Power Supply and Ground Circuit Check.

Is the inspection result normal?
YES (Present error)
Replace the BCM. Refer to [BCM: Removal and Installation] Removal and Replacement.
YES (Past error)
Error was detected in the BCM branch line.
NO
ERROR! Unknown action!Repair the power supply and the ground circuit.