DTC J and A/C ON
DTC indicator J and A/C ON: A Problem in the Mode Control Linkage, Doors, or Motor Circuit1. Turn the ignition switch to LOCK (0) and then to ON (II).
2. Do the self-diagnostic function with the climate control unit.
3. Check for DTCs.
Is DTC J and A/C ON indicated?
YES - Go to step 4.
NO - Intermittent failure, check for loose wires or poor connections on the mode control motor circuit.
4. Turn the ignition switch to LOCK (0).
5. Test the mode control motor.
Is the mode control motor OK?
YES - Go to step 6.
NO - Replace the mode control motor, or repair the mode control linkage or doors.
6. Disconnect the mode control motor 7P connector.
7. Disconnect climate control unit connector A (28P).
8. Check for continuity between the following terminals of climate control unit connector A (28P) and the mode control motor 7P connector.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire(s) between the climate control unit and the mode control motor.
9. Check for continuity between body ground and climate control unit connector A (28P) No. 7 and No. 8 terminals individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the mode control motor.
NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.