HVAC

DTC Troubleshooting: B1247 (12), B1247 (13)

DTC B1247 or DTC indicator 12 or 13:

An Open or Short 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 B1247 or 12 or 13 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 Replacement.�

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 -

Go to step 9.

NO -

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

9. Check for continuity between body ground and A/C control panel connector A (22P) terminals No. 3 and No. 13 individually, and between body ground and A/C control panel connector B (14P) terminal No. 10.









Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the A/C control panel and the rear mode control motor.�

NO -

Go to step 10.

10. Check for continuity between terminals of A/C control panel connectors A (22P) and B (14P) as follows.





Is there continuity between any of the terminals?

YES -

Repair a short in the wires.�

NO -

Go to step 11.

11. Turn the ignition switch to ON (II), and measure the same terminals for voltage to body ground.









Is there any voltage?

YES -

Repair a short to power in the wire(s) between the A/C control panel and the rear mode control motor. This short may also damage the A/C control panel. Repair the short to power before replacing the A/C control panel.�

NO -

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.�