P and Auto

DTC Troubleshooting: B1238 or Indicator P and AUTO

DTC B1238 or DTC indicator P and AUTO:A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor

1. Clear the DTC with the HDS.

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

3. Do the self-diagnostic with the HDS Initial Inspection and Diagnostic Overview or climate control unit. Initial Inspection and Diagnostic Overview

4. Check for DTCs.

Is DTC B1238 or P and AUTO indicated?
YES - Go to step 5.

NO - Intermittent failure.


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

6. 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.


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

8. Disconnect climate control unit connector A (24P).

9. Check for continuity between the following terminals of the climate control unit connector A (24P) and the passenger's air mix control motor 7P connector.





Is there continuity?
YES - Go to step 10.

NO - Repair open in the wire(s) between the climate control unit and the passenger's air mix control motor.






10. Check for continuity between body ground and climate control unit connector A (24P) No. 11 and No. 12 terminals individually.

Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the passenger's air mix control motor.

NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.