Mode Door Motor (Front) Diagnosis Procedure

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

1. CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
   1. Turn ignition switch OFF.
   2. Disconnect the front air control harness connector M52 and the mode door motor harness connector M144.
   3. Check continuity between front air control harness connector M52 terminals 1, 14 and the mode door motor harness connector M144 terminals 1, 6.

      Connector	Terminal	Connector	Terminal	Continuity
      M52	1	M144	1	Yes
      	14		6

   4. Check continuity between front air control harness connector M52 terminals 1, 6 and ground.

      Connector	Terminal	-	Continuity
      M52	1	Ground	No
      	6

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace harness as necessary.

2. CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND
   1. Reconnect front air control harness connector.
   2. Turn ignition switch ON.
   3. Rotate the mode switch to the D/F ( ) mode.
   4. Check voltage between front air control harness connector M52 terminal 1 and terminal 14 while rotating the mode switch to the VENT ( ), and then the B/L ( ) mode.

      Connector	Terminals		Condition	Voltage (Approx.)
      	(+)	(-)
      M52	1	14	While rotating the mode switch from D/F ( ) mode to VENT ( ) mode	Battery voltage
      	14	1	While rotating the mode switch from VENT ( ) mode to B/L ( ) mode	Battery voltage

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Replace front air control. Refer to "REMOVAL AND INSTALLATION ".

3. CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
   1. Turn ignition switch OFF.
   2. Disconnect the front air control harness connector M52.
   3. Check continuity between front air control harness connector M52 terminals 23, 26 and the mode door motor harness connector M144 terminals 2, 3.

      Connector	Terminal	Connector	Terminal	Continuity
      M52	23	M144	3	Yes
      	26		2

   4. Check continuity between front air control harness connector M52 terminals 23, 26 and ground.

      Connector	Terminal	-	Continuity
      M52	23	Ground	No
      	26

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair or replace harness as necessary.

4. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
   1. Check continuity between front air control harness connector M52 terminal 21 and mode door motor harness connector M144 terminal 4.

      Connector	Terminal	Connector	Terminal	Continuity
      M52	21	M144	4	Yes

   2. Check continuity between front air control harness connector M52 terminal 21 and ground.

      Connector	Terminal	-	Continuity
      M52	21	Ground	No

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace harness as necessary.

5. CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL
   1. Reconnect front air control harness connectors.
   2. Turn ignition switch ON.
   3. Check voltage between front air control harness connector M52 terminal 23 and terminal 26.

      Connector	Terminals	Connector	Terminals	Voltage (Approx.)
      	(+)		(-)
      M52	23	M52	26	5V

   4. Check voltage between front air control harness connector M52 terminal 21 and ground.

      Connector	Terminal	-	Voltage (Approx.)
      M52	21	Ground	0V

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace front air control. Refer to "REMOVAL AND INSTALLATION ".

6. CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
   1. Reconnect the mode door motor harness connector M144.
   2. Check voltage between front air control harness connector M52 terminal 21 and ground.

      Connector	Terminal	-	Voltage (Approx.)
      M52	21	Ground	0.2 to 4.8V

      Is the inspection result normal? 

      YES: Inspect mode door for binding or mechanical failure. If mode door moves freely, replace front air control. Refer to "REMOVAL AND INSTALLATION ".

      NO: Replace the mode door motor. Refer to "REMOVAL AND INSTALLATION ".