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DEFROSTER DOOR MOTOR CIRCUIT HAC-129 < DTC/CIRCUIT DIAGNOSIS > [MANUAL A/C (TYPE 1)] C D E F G H J K L M A B HAC N O P NO >> Replace front air control. Refer to VTL-8, "Removal and Installation" . 4. CHECK DEFROSTER DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND 1. Turn ignition switch OFF. 2. Disconnect the front air control harness connectors M180 (C) and M181 (A). 3. Check continuity between front air control harness connector M180 (C) terminal 3, and M181 (A) terminal 28 and the defroster door motor harness connector M144 (B) terminals 2, 3. 4. Check continuity between front air control harness connector M180 (C) terminal 3, M181 (A) terminal 28 and ground. Is the inspection result normal? YES >> GO TO 5. NO >> Repair or replace harness as necessary. 5. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 1. Check continuity between front air control harness connector M180 (A) terminal 10 and defroster door motor harness connec- tor M144 (B) terminal 4. 2. Check continuity between front air control harness connector M180 terminal 10 and ground. Is the inspection result normal? YES >> GO TO 6. NO >> Repair or replace harness as necessary. 6. CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL A and C B Continuity Connector Terminal Connector Terminal M180 (C) 3 M144 2 Yes M181 (A) 28 3 Connector Terminal — Continuity M180 (C) 3 Ground No M181 (A) 28 AWIIA0393ZZ A B Continuity Connector Terminal Connector Terminal M180 10 M144 4 Yes AWIIA0410ZZ Connector Terminal — Continuity M180 10 Ground No AWIIA0409ZZ |