1.CHECK CONNECTOR

1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
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.

   A/C auto amp. harness connector | Resistance (Ω)
   Connector No. | Terminal No.
   M66 | 1 | 2 | Approx. 54 – 66

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 Diagnosis Procedure.
Is the inspection result normal?
YES (Present error)>>Replace the A/C auto amp. Refer to Exploded View.
YES (Past error)>>Error was detected in the A/C auto amp. branch line.
NO>>Repair the power supply and the ground circuit.