CAN

HVAC BRANCH LINE CIRCUIT

Diagnosis Procedure


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 connector side).
-A/C auto amp.
-Harness connector M28 and PCB harness side connector
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- GO TO 4.

3. CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the A/C auto amp. A/C Auto Amp..
Is the inspection result normal?
YES (Present error)-Replace the A/C auto amp. 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.

4. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.Disconnect the harness connector M28.
2.Check the continuity between the A/C auto amp. harness connector and the harness connector.





Is the inspection result normal?
YES- Replace the PCB harness.
NO- Repair the harness between the A/C auto amp. harness connector M66 and the harness connector M28.