Toyota
Nissan Versa
 Sedan Service Manual
Ventilation, heater & air conditioner » Heater & air conditioning control system (HAC)
A/C On signal

Component Function Check

1.CHECK A/C ON SIGNAL

With CONSULT

  1. Turn ignition switch ON.
  2. Operate front blower motor.
  3. Select "AIR CONDITIONER" of "BCM" using CONSULT.
  4. Select "AIR COND SW" in "DATA MONITOR" mode, and check status under the following condition.   

Is the inspection result normal?

YES >> Inspection End.

NO >> Refer to HAC "Diagnosis Procedure".

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC "Wiring Diagram".

1.CHECK FUSE

  1. Turn ignition switch OFF.
  2. Check 10A fuse (No. 21, located in fuse block (J/B)].

NOTE: Refer to PG "Terminal Arrangement".

Is the inspection result normal?

YES >> GO TO 2.

NO >> Replace the blown fuse after repairing the affected circuit.

2.CHECK THERMO CONTROL AMP. POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect thermo control amp. connector.
  3. Turn ignition switch ON.
  4. Check voltage between thermo control amp. harness connector and ground.  

Is the inspection result normal?

YES >> GO TO 3.

NO >> Repair harness or connector between thermo control amp. and fuse.

3.CHECK THERMO CONTROL AMP. GROUND CIRCUIT FOR OPEN

  1.  Turn ignition switch OFF.
  2. Check continuity between thermo control amp. harness connector and ground  

Is the inspection result normal?

YES >> GO TO 4.

NO >> Repair harness or connector.

4.CHECK A/C ON SIGNAL

  1. Turn ignition switch ON.
  2. Check output waveform between thermo control amp. harness connector and ground with using oscilloscope.

Is the inspection result normal?

YES >> GO TO 5.

NO >> GO TO 6.

5.CHECK FRONT AIR CONTROL

  1. Turn ignition switch OFF.
  2. Check front air control. Refer to HAC "Component Inspection".

Is the inspection result normal?

YES >> Replace thermo control amp. Refer to HAC "Removal and Installation".

NO >> Replace front air control. Refer to HAC "Removal and Installation".

6.CHECK A/C ON SIGNAL CIRCUIT FOR OPEN

  1. Turn ignition switch OFF.
  2. Disconnect BCM and front air control connector.
  3. Check continuity between thermo control amp. harness connector and BCM harness connector.
  4. Check continuity between front air control harness connector and BCM harness connector.

Is the inspection result normal?

YES >> Replace BCM. Refer to BCS "Removal and Installation" or BCS "Removal and Installation".

NO >> Repair harness or connector.

Component Inspection

1.CHECK A/C CONTROL

Check continuity front air control terminals.                   

Is the inspection result normal?

YES >> Inspection End.

NO >> Replace front air control. Refer to HAC "Removal and Installation".

    More about «Heater & air conditioning control system (HAC)»:

    Precautions

    Manual air conditioning system

    Diagnosis and repair workflow

    Operation inspection

    A/C On signal

    Blower fan on signal

    A/C Indicator

    Front blower motor

    Magnet clutch

    Insufficient cooling

    Insufficient heating

    Compressor does not operate

    Front air control

    Refrigerant pressure sensor

    Blower fan resistor

    Intake door cable

    Mode door cable

    Air mix door cable

    Nissan Versa Sedan Service Manual / Ventilation, heater & air conditioner / Heater & air conditioning control system (HAC) / A/C On signal

    Nissan Versa Sedan Service Manual

    Categories


    © 2017-2020 Copyright www.niveguide.com