An Open In the Rear Mode Control Motor Circuit

DTC B1221 or DTC indicator 12: An Open in the Rear Mode Control Motor Circuit

1. Clear the DTC by turning the ignition switch to LOCK (0), and then turn to ON (II).
2. Operate the A/C control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic.

Is DTC B1221 or 12 indicated?

YES - Go to step 4.

NO - Intermittent failure, check for loose wires or poor connections on the rear mode control motor circuit.

4. Turn the ignition switch to LOCK (0).
5. Test the rear mode control motor.

Is the rear mode control motor OK?

YES - Go to step 6.

NO - Replace the rear mode control motor.

6. Disconnect the rear mode control motor 7P connector.
7. Disconnect A/C control panel connector A (22P) and B (14P).
8. Check for continuity between following terminals of A/C control panel connector A (22P) and B (14P) and the rear mode control motor 7P connector.






Is there continuity?

YES - Check for loose wire or poor connections at A/C control panel connector A (22P) and B (14P) and at the rear mode control motor 7P connector. If the connections are good, substitute a known-good A/C control panel, and recheck. If the symptom/indication goes away, replace the original A/C control panel.

NO - Repair open in the wire(s) between the A/C control panel and the rear mode control motor.