Procedure A
PROCEDURE A: TRAILER LIGHTS WIRING CONNECTOR TERMINAL CHECKCheck the condition of the BCM by performing a terminal check at the Trailer Lights Wiring Connector (near the trailer hitch) as follows.
Procedure A (Terminal Check) is split up into two sections:
^ Section 1: For vehicles with a 4-terminal Trailer Lights Wiring Connector.
^ Section 2: For vehicles with a 7-terminal Trailer Lights Wiring Connector.
NOTE:
For vehicles without a trailer lights wiring connector, the BCM condition will be checked later in Procedure B.
Section 1: Vehicles Equipped With 4-terminal Trailer Lights Wiring Connector
1. Turn the ignition switch to the ON position.
2. Make sure the combination switch and hazard switch are OFF.
3. Using a Test Light, check for power at terminals # 3 and # 4 (see Figure 1).
^ If there is power at either terminal, replace the BCM. Return to the Repair Flow Chart for further instructions.
^ If there is NO power at either terminal, the circuit is OK. Return to the Repair Flow Chart for further instructions.
4. Turn the ignition switch OFF.
Section 2: Vehicles Equipped With 7-terminal Trailer Lights Wiring Connector
1. Turn the ignition switch to the ON position.
2. Make sure the combination switch and hazard switch are OFF.
3. Using a Test Light, check for power at terminals # 2 and # 5 (see Figure 2).
^ If there is power at either terminal, replace the BCM. Return to the Repair Flow Chart for further instructions.
^ If there is NO power at either terminal, the circuit is OK. Return to the Repair Flow Chart for further instructions.
4. Turn the ignition switch OFF.