Nissan Altima 2007-2012 Service Manual: Power supply and ground circuit for front air control

Description

FRONT AIR CONTROL

The front air control has a built-in microcomputer which processes information sent from temperature control dial and various switches needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower motor and compressor are then controlled.

POTENTIO TEMPERATURE CONTROL (PTC)

The PTC is built into the front air control.

Component Function Check

COMPONENT INSPECTION

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK

1. Press A/C switch (indicator should illuminate).

2. Confirm that the compressor clutch engages (sound or visual inspection).

Can a symptom be duplicated? YES >> GO TO 3

NO >> GO TO 2

2. PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to HAC-102, "Operational Check".

Is the inspection result normal? YES >> Refer to HAC-155, "Symptom Matrix Chart".

NO >> System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4. CHECK MAIN POWER SUPPLY AND GROUND CIRCUIT

Check main power supply and ground circuit. Refer to HAC-135, "Diagnosis Procedure".

Is the inspection result normal? YES >> Replace front air control. Refer to VTL-8, "Removal and Installation".

NO >> Repair as necessary.

Diagnosis Procedure

DIAGNOSIS PROCEDURE FOR A/C SYSTEM

SYMPTOM: A/C system does not come on.

1.CHECK POWER SUPPLY CIRCUIT FOR FRONT AIR CONTROL

1. Disconnect front air control connector M37.

2. Press ignition switch ON.

3. Check voltage between front air control connector M37 terminals 39 and 40, and ground.

Is the inspection result normal? YES >> GO TO 2

NO >> Check the following.

• 10A fuses [Nos. 6, and 3, located in the fuse block (J/B)].

• If fuses are OK, check for open circuit in wiring harness. Repair or replace as necessary.

• If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.

2.CHECK BODY GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Check continuity between front air control connector M37 terminals 17and 37 and ground.

Is the inspection result normal? YES >> • Replace front air control. Refer to VTL-8, "Removal and Installation".

• Inspection End.

NO >> Repair or replace harness.

    Magnet clutch
    Component Function Check INSPECTION FLOW 1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - MAGNET CLUTCH 1. Press ignition switch ON. 2. Press vent switch ( ). 3. Press A/C switch. 4. C ...

    ECU diagnosis
    AIR CONDITIONER CONTROL Reference Value VALUES ON THE DIAGNOSIS TOOL TERMINAL LAYOUT PHYSICAL VALUES Wiring Diagram - Air Conditioner Control (Manual) - Coupe Wiring D ...

    Other materials:

    Driver side
    Description Detects condition of the front power window motor LH operation and transmits to main power window and door lock/unlock switch as pulse signal. Component Function Check 1. CHECK ENCODER OPERATION Does front door glass LH perform AUTO open/close operation normally when operating ...

    Main line between DLC and ABS circuit
    Diagnosis Procedure INSPECTION PROCEDURE 1.CHECK CONNECTOR 1. Turn the ignition switch OFF. 2. Disconnect the battery cable from the negative terminal. 3. Check the following terminals and connectors for damage, bend and loose connection (connector side and harness side). - Harness co ...

    Sound signal circuit (coupe)
    SATELLITE RADIO TUNER Description Left and right channel audio signals are supplied from the satellite radio tuner to the audio unit through the sound signal circuits. Diagnosis Procedure LEFT CHANNEL 1.CHECK HARNESS 1. Turn ignition switch OFF. 2. Disconnect satellite radio tuner (fact ...