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HAC-66 < DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONER] REAR AIR CONTROL SYSTEM 19. CHECK REAR AIR CONTROL (REAR) AUX TEMP POT VOLTAGE Check voltage between A/C auto amp. harness connector M50 terminal 51 and ground while turning knob between full cold and full hot. Is the inspection result normal? YES >> GO TO 21. NO >> GO TO 20. 20. CHECK REAR AIR CONTROL (REAR) AUX TEMP POT CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect A/C auto amp. connector and rear air control (rear) connector. 3. Check continuity between A/C auto amp. harness connector M50 terminal 51 and rear air control (rear) harness connector M208 terminal 7. Is the inspection result normal? YES >> Replace A/C auto amp. Refer to VTL-7, "Removal and Installation" NO >> Repair harness or connector. 21. CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN AND SHORT TO GROUND 1. Turn ignition switch OFF. 2. Disconnect the A/C auto amp. harness connector M50 and the air mix door motor (rear) harness connec- tor B155. 3. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and the air mix door motor (rear) harness connector B155 terminal 1, 6. 4. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and ground. Is the inspection result normal? YES >> GO TO 22. NO >> Repair or replace harness as necessary. 22. CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (REAR) POWER AND GROUND 1. Reconnect A/C auto amp. harness connector. 2. Turn ignition switch ON. 3. Rotate temperature control dial (rear) to maximum hot. 4. Check voltage between A/C auto amp. harness connector M50 terminal 43 and terminal 44 while rotating temperature control dial (rear) to maximum cold and back to maximum heat. Connector Terminals Voltage (Ap- prox.) (+) (-) A/C auto amp.: M50 51 Ground Varying be- tween 0.1V and 4.9V Continuity should exist. Connector Terminal Connector Terminal Continuity M50 43 B155 1 Yes 44 6 Connector Terminal — Continuity M50 43 Ground No 44 August 2012 2012 Pathfinder |