Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. 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.

RESISTANCE SPECIFICATION

A/C auto amp. harness connector			Resistance (Ω)
Connector No.	Terminal No.		Resistance (Ω)
M37	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.

CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the A/C auto amp. Refer to the following.
- Models with color display: "A/C AUTO AMP.: DIAGNOSIS PROCEDURE "
- Models with monochrome display: "A/C AUTO AMP.: DIAGNOSIS PROCEDURE "
Is the inspection result normal?

YES (Present error): Replace the A/C auto amp. Refer to "REMOVAL AND INSTALLATION " (with color display) or "REMOVAL AND INSTALLATION " (with monochrome display).

YES (Past error): Error was detected in the A/C auto amp. branch line.

NO: Repair the power supply and the ground circuit.