DTC Q
DTC B1238 or DTC indicator Q: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.
Is DTC B1238 or Q indicated?
YES - Go to step 5.
NO - Intermittent failure.
5. Turn the ignition switch OFF.
6. Test the passenger's air mix control motor.
Are the passenger's air mix control motor and linkage OK?
YES - Go to step 7.
NO - Replace the passenger's air mix control motor, or repair the passenger's air mix control linkage or door.
7. Disconnect the passenger's air mix control motor 7 P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the following terminals of audio-HVAC display panel connector A (22P) 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 audio-HVAC display panel and the passenger's air mix control motor.
10. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 10 and No. 22 individually.
Is there continuity?
YES - Repair open in the wire(s) between the audio-HVAC display panel and the passenger's air mix control motor.
NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.