N and AUTO

DTC Troubleshooting: B1238 (N and AUTO)

DTC B1238 or DTC indicator N and AUTO:

A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor

1. Clear the DTC by turning the ignition switch to LOCK (0), and then turn to ON (II).

2. Operate the climate control system in several modes.

3. Check for DTCs using the HDS How to Troubleshoot the Climate Control System or self-diagnostic function How to Troubleshoot the Climate Control System.

Is DTC B1238 or N and AUTO indicated?

YES -

Go to step 4.

NO -

Intermittent failure.�

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

5. Test the passenger's air mix control motor Passenger's Air Mix Control Motor Test.

Is the passenger's air mix control motor OK?

YES -

Go to step 6.

NO -

Replace the passenger's air mix control motor Passenger's Air Mix Control Motor Replacement, or repair the passenger's air mix control linkage or door.�

6. Disconnect the passenger's air mix control motor 7P connector.

7. Disconnect the front climate control unit 30P connector.

8. Check for continuity between following terminals of the front climate control unit 30P connector and the passenger's air mix control motor 7P connector.









Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire(s) between the front climate control unit and the passenger's air mix control motor.�

9. Check for continuity between body ground and front climate control unit 30P connector terminals No. 12 and No. 13 individually.





Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the front climate control unit and the passenger's air mix control motor.�

NO -

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