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LAN HVAC BRANCH LINE CIRCUIT LAN-187 < DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 5)] C D E F G H I J K L B A O P N HVAC BRANCH LINE CIRCUIT Diagnosis Procedure INFOID:0000000011506774 1. CHECK CONNECTOR 1. Turn the ignition switch OFF. 2. Disconnect the battery cable from the negative terminal. 3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con- nector side). - A/C auto amp. (With auto A/C) - Harness connector M127 (With auto A/C) - Harness connector M125 (With auto A/C) - Front air control (Without auto A/C) - BCM Is the inspection result normal? YES >> GO TO 2. (With auto A/C) YES >> GO TO 3. (Without auto A/C) NO >> Repair the terminal and connector. 2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT) 1. Disconnect the connector of BCM. 2. Check the continuity between the BCM harness connector terminals. Is the inspection result normal? YES >> GO TO 3. NO >> Check the harness and repair the root cause (CAN communication circuit 2 side). Refer to . 3. CHECK HARNESS FOR OPEN CIRCUIT 1. Connect the connector of BCM (With auto A/C). 2. Disconnect the connector of A/C auto amp. (With auto A/C) or front air control (Without auto A/C). 3. Check the resistance between the A/C auto amp. (With auto A/C) or front air control (Without auto A/C) harness connector terminals. - With auto A/C - Without auto A/C Is the measurement value within the specification? YES >> GO TO 4. NO >> Repair the A/C auto amp. (With auto A/C) or front air control (Without auto A/C) branch line. 4. CHECK POWER SUPPLY AND GROUND CIRCUIT Check the power supply and the ground circuit of the A/C auto amp. (With auto A/C) or front air control (With- out auto A/C). Refer to the following. • Automatic air conditioning: BCM harness connector Continuity Connector No. Terminal No. M18 6 8 Existed 5 9 Existed A/C auto amp. harness connector Resistance ( Ω) Connector No. Terminal No. M54 11 31 Approx. 54 – 66 Front air control harness connector Resistance ( Ω) Connector No. Terminal No. M50 7 23 Approx. 54 – 66 |