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 A/C AUTO AMP. (REAR WINDOW DEFOGGER SWITCH)
Does A/C auto amp. operate normally?

Is the inspection result normal?

YES: Inspection End.

NO: GO TO 2

CHECK REAR WINDOW DEFOGGER SWITCH INDICATOR CIRCUIT

Turn ignition switch ON.

Check voltage between A/C auto amp. connector and ground.

TERMINAL VOLTAGE REFERENCE CHART

Terminals			Condition of rear window defogger switch	Voltage (V) (Approx.)
(+)		(-)
A/C auto amp. connector	Terminal
M37	26	Ground	ON	Battery voltage
			OFF	0

Fig 1: Checking Voltage Between A/C Auto Amp. Connector And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: Replace A/C auto amp. Refer to "FAN CONTROL AMP.: REMOVAL AND INSTALLATION ".

NO: Repair or replace harness.