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LAN-166 < DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 3)] HVAC BRANCH LINE CIRCUIT HVAC BRANCH LINE CIRCUIT Diagnosis Procedure INFOID:0000000010415423 1. CHECK CONNECTOR 1. Turn the power switch OFF. 2. Disconnect the 12V battery cable from the negative terminal. Refer to LAN-26, "Precautions for Removing 3. Check the terminals and connectors of the A/C auto amp. for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? YES >> GO TO 2. NO >> Repair the terminal and connector. 2. CHECK HARNESS FOR OPEN CIRCUIT 1. Disconnect the connector of A/C auto amp. 2. Check the resistance between the A/C auto amp. harness connector terminals. Is the measurement value within the specification? YES >> GO TO 3. NO >> Repair the A/C auto amp. branch line. 3. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the A/C auto amp. Refer to the following. • Auto A/C (With heat pump): HAC-173, "A/C AUTO AMP. : Diagnosis Procedure" • Auto A/C (Without heat pump): HAC-333, "A/C AUTO AMP. : Diagnosis Procedure" Is the inspection result normal? YES (Present error)>>Replace the A/C auto amp. Refer to the following. • Auto A/C (With heat pump): HAC-187, "Removal and Installation" • Auto A/C (Without heat pump): HAC-347, "Removal and Installation" YES (Past error)>>Error was detected in the A/C auto amp. branch line. NO >> Repair the power supply and the ground circuit. A/C auto amp. harness connector Resistance ( Ω) Connector No. Terminal No. M55 28 29 Approx. 54 – 66 |