DTC 5

DTC 5: A Problem in the A/C Bus (Communication Line) Circuit

1. Disconnect the rear heater-A/C control panel-unit UP connector.
2. Disconnect climate control unit connector A (16P).




3. Check for continuity between the No.1 terminal of the rear heater-A/C control panel-unit 14P connector and the No.1 terminal of climate control unit connector A (16P).

Is there continuity?

YES - Go to step 4.

NO - Repair open in the wire between the rear heater-A/C control panel-unit and the climate control unit.




4. Check for continuity between the No.1 terminal of the rear heater-A/C control panel-unit 14P connector and body ground.

Is there continuity?

YES - Repair short to body ground in the wire between the rear heater-A/C control panel-unit and the climate control unit.

NO - Check for loose wires or poor connections at the rear heater-A/C control panel-unit 14P connector and at climate control unit connector A (16P). If the connections are good, substitute a known-good rear heater-A/C control panel-unit, and recheck. If the problem still exists, replace the climate control unit.