Diagnosis Procedure For Front Air Control

SYMPTOM: A/C system cannot be controlled.

Fig 1: Front Air Control Self - Diagnosis Circuit

Courtesy of NISSAN MOTOR CO., U.S.A.

1. ENTER SELF-DIAGNOSIS FOR FRONT AIR CONTROL 
   1. Start engine.
   2. Within 10 seconds after starting the engine, press and hold the MODE switch and the DUAL switch for more than three seconds.
   3. Within 10 seconds after turning the ignition switch ON, press and hold the MODE switch and the DUAL switch for more than three seconds. All LED's on the front air control will illuminate.

   : GO TO  2.

   Fig 2: Locating DUAL And MODE Switch

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK EACH SWITCH AND CONTROL DIAL ON THE FRONT AIR CONTROL 
   1. While monitoring the LEDs on the front air control press each switch twice. All LEDs will toggle ON or OFF each time it's pushed.
   2. While monitoring the LEDs on the front air control, rotate the temperature control dials (driver and pass). All LEDs will toggle ON or OFF each time the dial is rotated.

   Do all LEDS flash ON and then OFF? 

   OK: Inspection End.

   NG: Replace front air control. Refer to "CENTER STACK ASSEMBLY "

   Fig 3: Identifying Potentio Temperature Control (PTC) Panel Buttons

   Courtesy of NISSAN MOTOR CO., U.S.A.