Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

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.

CHECK HARNESS FOR OPEN CIRCUIT

Disconnect the connector of A/C auto amp.

Check the resistance between the A/C auto amp. harness connector terminals.

A/C auto amp. harness connector			Resistance (Ohm)
Connector No.	Terminal No.
M50	1	21	Approx. 54 - 66

Is the measurement value within the specification?

YES

GO TO 3.

Repair the A/C auto amp. branch line.

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

Replace the A/C auto amp. Refer to Removal and Installation .

YES

Error was detected in the A/C auto amp. branch line.

NO

Repair the power supply and the ground circuit.