A/C SWITCH ASSEMBLY: 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 SWITCH ASSEMBLY POWER SUPPLY

Disconnect the A/C switch assembly connector.
Turn ignition switch ON.
Check voltage between A/C switch assembly harness connector M104 terminal 1 and ground.

TERMINAL VOLTAGE CHART

(+)		(-)	Voltage
A/C switch assembly		-	Ignition switch position
Connector	Terminal	-	OFF	ACC	ON
M104	1	Ground	Approx. 0V	Battery voltage	Battery voltage

Fig 1: Checking Voltage Between A/C Switch Assembly Harness Connector M104 Terminal 1 And Ground

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

Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 2.

CHECK FUSE
Check 10A fuse [No.3, located in the fuse block (J/B)].

NOTE: Refer to "TERMINAL ARRANGEMENT ".

Is the inspection result normal?

YES: Check harness for open circuit. Repair or replace if necessary.

NO: Check harness for short circuit. Repair or replace if necessary.
CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C switch assembly harness connector M104 terminal 2 and ground.
  2 - Ground: Continuity should exist.
Is the inspection result normal?

YES: Replace the A/C switch assembly. Refer to "REMOVAL AND INSTALLATION ".

NO: Repair the harnesses or connectors.

Fig 2: Checking Continuity Between A/C Switch Assembly Harness Connector M104 Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.