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.

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

Fig 1: Magnet Clutch Does Not Engage When A/C Switch Is ON - Circuit Diagram

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

INSPECTION IN AUTO ACTIVE TEST MODE

Perform "AUTO ACTIVE TEST". Refer to "DIAGNOSIS DESCRIPTION ".

Does it operate normally?

YES: GO TO 6.

NO: GO TO 2.

CHECK POWER SUPPLY FOR A/C COMPRESSOR

Disconnect A/C compressor connector.
Start engine and press A/C switch.
Check voltage between A/C compressor harness connector F3 terminal 1 and ground.

TERMINAL VOLTAGE CHART

Terminal		Voltage (V) (Approx.)
(+)	(-)	Voltage (V) (Approx.)
Connector - Terminal	Body ground	12V
F3-1	Body ground	12V

Fig 2: Checking Voltage Between A/C Compressor Harness Connector F3 Terminal 1 And Ground

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

Is the inspection result normal?

YES: Check magnet clutch coil.

If NG, replace magnet clutch. Refer to "REMOVAL AND INSTALLATION FOR COMPRESSOR ".
If OK, check A/C compressor mounting points for looseness or corrosion and repair as necessary.

NO: GO TO 3

CHECK FUSE
Check 10A fuse (No. 41) located in IPDM E/R.

NOTE: Refer to "FUSE, CONNECTOR AND TERMINAL ARRANGEMENT " for fuse location.

Is the inspection result normal?

YES: GO TO 4.

NO: GO TO 5.
CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY IN IPDM E/R AND A/C COMPRESSOR
1. Turn ignition switch ON.
2. Disconnect IPDM E/R connector F10 and A/C compressor connector F3.
3. Check continuity between A/C compressor harness connector F3 (A) terminal 1 and IPDM E/R harness connector F10 (B) terminal 48.
  1 - 48: Continuity should exist.
  
  Fig 3: Checking Continuity Between A/C Compressor Connector F3 Terminal 1 And IPDM E/R Connector F10 Terminal 48
  Courtesy of NISSAN MOTOR CO., U.S.A.
Is the inspection result normal?

YES: Replace A/C Relay.

NO: Repair harness or connector.
CHECK A/C COMPRESSOR CIRCUIT FOR SHORT
Check continuity between A/C compressor harness connector F3 terminal 1 and ground.

1 - Ground: Continuity should not exist.

Fig 4: Checking Continuity Between A/C Compressor Harness Connector F3 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

NO: Repair harness or connector.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1. Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results.
NOTE: If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to "DTC LOGIC - U1000 CAN COMM CIRCUIT " or "DTC LOGIC - U1010 CONTROL UNIT (CAN) ".

Is any DTC No. displayed?

YES: Perform diagnosis for the applicable DTC. Refer to "DTC INDEX ".

NO: GO TO 7.
CHECK A/C AUTO AMP. INPUT SIGNAL
Using CONSULT-III, check "On/Off" of "AIR COND SIG" and "HEATER FAN SW" in "DATA MONITOR" of HVAC. Refer to "CONSULT-III FUNCTION ".

A/C SWITCH ON: AIR COND SIG On

A/C SWITCH OFF: AIR COND SIG Off

FAN CONTROL DIAL ON: HEATER FAN SW On

FAN CONTROL DIAL OFF: HEATER FAN SW Off

Is the inspection result normal?

YES: GO TO 8.

NO: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".
CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to "COMPONENT FUNCTION CHECK ".

Is the inspection result normal?

YES: Inspection End.

NO: Repair or replace malfunctioning parts.