Diagnostic Procedure For Rear Air Control

WARNING: This page is about a different car, the 2005 Nissan Quest. 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/mode operation is malfunctioning.

CHECK OPERATION FROM FRONT AIR CONTROL
Does rear temperature/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 OR SHORT
1. Disconnect front air control and rear air control connectors.
2. Check continuity between front air control harness connector M50 terminal 33 (V) and rear air control harness connector B142 terminal 5 (V).
  
  Fig 1: Checking Continuity Between Front Air Control Harness Connector M50 Terminal 33 & Rear Air Control Harness Connector B142 Terminal 5
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - Continuity should exist.
3. Check continuity between rear air control harness connector B142 terminal 5 (V) and 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
1. Disconnect air mix door motor (rear) connectors.
2. Check continuity between rear air control harness connector B142 terminal 2 (Y) and 4 (W/G) and air mix door motor (rear) harness connector B146 terminal 2 (Y) and 3 (W/G).
  
  Fig 2: Checking Continuity Between Rear Air Control Harness Connector B142 & Terminal 2, 4 & Air Mix Door Motor Harness Connector B146 Terminals 2, 3
  Courtesy of NISSAN MOTOR CO., U.S.A.
  - Continuity should exist.
3. Check continuity between rear air control harness connector B142 terminals 2 (Y) and 4 (W/G) and ground.
  Continuity should not exist.
OK or NG
- OK: Replace rear air control. Refer to "REAR AIR CONTROL ".
- NG: Repair harness or connector.