DTC Troubleshooting: B1221 (12)

DTC Troubleshooting: B1221 (12)

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 How to Troubleshoot the Heating and A/C Systems or self-diagnostic function How to Troubleshoot the Heating and A/C Systems.

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 Rear Mode Control Motor Test.

Is the rear mode control motor OK?

YES -

Go to step 6.

NO -

Replace the rear mode control motor Rear Mode Control Motor Test.�

6. Disconnect the rear mode control motor 7P connector.

7. Disconnect A/C control panel connectors A (22P) and B (14P).

8. Check for continuity between following terminals of A/C control panel connectors 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 connectors 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 A/C Control Panel Removal/Installation.�

NO -

Repair an open in the wire(s) between the A/C control panel and the rear mode control motor.�