Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL 
   1. Turn ignition switch ON.
   2. Check output waveform between A/C auto amp. harness connector and ground with the oscilloscope.

      +		-	Output waveform
      A/C auto amp.
      Connector	Terminal
      M50	16	Ground

   Is the inspection result normal? 

   YES: GO TO  2.

   NO: GO TO  3.

2. CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN 
   1. Turn ignition switch OFF.
   2. Disconnect A/C auto amp. connector and intake door motor connector.
   3. Check continuity between A/C auto amp. harness connector and intake door motor harness connector.

      A/C auto amp.		Intake door motor		Continuity
      Connector	Terminal	Connector	Terminal
      M50	16	M128	2	Yes

   Is the inspection result normal? 

   YES: Inspection End.

   NO: Repair harness or connector.

3. CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR SHORT 
   1. Disconnect following connectors.
      • Air mix door motor (driver side)
      • Air mix door motor (passenger side)
      • Mode door motor (front)
      • Rear shut-off door motor
      • Air mix door motor (rear)
      • Mode door motor (rear)
   2. Check continuity between A/C auto amp. harness connector and ground.

      A/C auto amp.		-	Continuity
      Connector	Terminal
      M50	16	Ground	No

   Is the inspection result normal? 

   YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

   NO: Repair harness or connector.