Problem in the Rear Air Mix Control Linkage, Door, or Motor Circuit

DTC Troubleshooting: B1246 (7)

DTC B1246 or DTC indicator 7:

A Problem in the Rear Air Mix Control Linkage, Door, or Motor Circuit

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Do the self-diagnostic function with the HDS or the HVAC control unit.

4. Check for DTCs.

Is DTC B1246 or 7 indicated?

YES -

Go to step 5

NO -

Intermittent failure, check for loose wires or poor connections in the rear air mix control motor circuit.�

5. Turn the ignition switch to LOCK (0).

6. Test the rear air mix control motor .

Is the rear air mix control motor OK?

YES -

Go to step 7.

NO -

Replace the rear air mix control motor, or repair the rear air mix control linkage or door.�

7. Disconnect the rear air mix control motor 7P connector.

8. Disconnect HVAC control unit connector B (16P).

9. Check for continuity between the following terminals of HVAC control unit connector B (16P) and the rear air mix control motor 7P connector.









Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire(s) between the HVAC control unit and the rear air mix control motor.�

10. Check for continuity between body ground and HVAC control unit connector B (16P) terminals No. 7 and No. 8 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the HVAC control unit and the rear air mix control motor.�

NO -

Substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, replace the original HVAC control unit HVAC Control Unit Removal/Installation.�