Communication System B

Check the terminals (at the control unit and harness) on the malfunctioning LCU for disconnection, bend, and other malfunctions.

OK or NG? 

1. OK >> GO TO 2.
2. NG >> Repair the terminals and connectors.

Replace the LCU with a known-good one, and perform the communication diagnosis. Refer to "COMMUNICATION DIAGNOSIS  ".

OK or NG? 

1. OK >> Replace the LCU.
2. NG >> Repair the communication harness between the indicated LCU and BCM.