Diagnostic Procedure For Rear Air Control
WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM:
- Blower motor operation is malfunctioning. Refer to "REAR BLOWER MOTOR CIRCUIT ".
- Temperature and mode operation is malfunctioning.
- CHECK OPERATION FROM FRONT AIR CONTROL
Does rear temperature and mode operate normally from front air control?
YES or NO
- YES: GO TO 2.
- NO: Refer to "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (REAR) ".
- CHECK CIRCUIT BETWEEN REAR AIR CONTROL AND FRONT AIR CONTROL FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect front air control and rear air control connectors.
- Check continuity between front air control harness connector M50 terminal 33 (V) and rear air control harness connector R209 terminal 5 (V).
- 33 - 5 Continuity should exist.
- Check continuity between rear air control harness connector R209 terminal 5 (V) and ground.
- 5 - Ground Continuity should not exist.
OK or NG
- OK: GO TO 3.
- NG: Repair harness or connector.
- CHECK CIRCUIT BETWEEN REAR AIR CONTROL AND AIR MIX DOOR MOTOR (REAR) FOR OPEN OR SHORT
- Disconnect air mix door motor (rear) connector.
- Check continuity between rear air control harness connector R209 terminal 2 (P) and 4 (Y) and air mix door motor (rear) harness connector B155 terminal 2 (P) and 3 (Y).
- 2 - 2 Continuity should exist.
- 4 - 3 Continuity should exist.
- Check continuity between rear air control harness connector R209 terminals 2 (P) and 4 (Y) and ground.
- 2, 4 - Ground Continuity should not exist.
OK or NG
- OK: Replace rear air control.
- NG: Repair harness or connector.