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Home >> Infiniti >> 2017 >> QX70 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 229 (Heater & Air Conditioning Control System (DTC/Circuit Diagnosis) (Hybrid)) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> A/C Auto Amp. >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK FUSE (IGNITION POWER SUPPLY)

    1. Turn ignition switch OFF.
    2. Check 5 A fuses [No. 14, located in fuse block (J/B)].
      NOTE:

      Refer to FUSE, CONNECTOR AND TERMINAL ARRANGEMENT .

    Is the inspection result normal?

    YES 

    GO TO STEP 2. 

    NO 

    Replace the blown fuse after repairing the affected circuit if a fuse is blown.

  2. CHECK A/C AUTO AMP. IGNITION POWER SUPPLY

    1. Disconnect A/C auto amp. connector.
    2. Turn ignition switch ON.
    3. Check voltage between A/C auto amp. harness connector and ground.
      + - Voltage
      A/C auto amp.
      Connector Terminal
      M88 23 Ground 11 - 14 V

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair harness or connector between A/C auto amp. and fuse.

  3. CHECK FUSE (ACCESSORY POWER SUPPLY)

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

      Refer to FUSE, CONNECTOR AND TERMINAL ARRANGEMENT .

    Is the inspection result normal?

    YES 

    GO TO STEP 4. 

    NO 

    Replace the blown fuse after repairing the affected circuit if a fuse is blown.

  4. CHECK A/C AUTO AMP. ACCESSORY POWER SUPPLY

    1. Disconnect A/C auto amp. connector.
    2. Turn ignition switch ACC.
    3. Check voltage between A/C auto amp. harness connector and ground.
      + - Voltage
      A/C auto amp.
      Connector Terminal
      M88 13 Ground 11 - 14 V

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair harness or connector between A/C auto amp. and fuse.

  5. CHECK FUSE (BATTERY POWER SUPPLY)

    1. Turn ignition switch OFF.
    2. Check 10 A fuse [No. 6, located in fuse block (J/B)].
      NOTE:

      Refer to FUSE, CONNECTOR AND TERMINAL ARRANGEMENT .

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Replace the blown fuse after repairing the affected circuit if a fuse is blown.

  6. CHECK A/C AUTO AMP. BATTERY POWER SUPPLY

    1. Disconnect A/C auto amp. connector.
    2. Check voltage between A/C auto amp. harness connector and ground.
      + - Voltage
      A/C auto amp.
      Connector Terminal
      M88 3 Ground 11 - 14 V

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair harness or connector between A/C auto amp. and fuse.

  7. CHECK A/C AUTO AMP. GROUND CIRCUIT FOR OPEN

    1. Turn ignition switch OFF.
    2. Check continuity between A/C auto amp. harness connector and ground.
      A/C auto amp. - Continuity
      Connector Terminal
      M88 2 Ground Existed
      22
      37
      M88 54
      56

    Is the inspection result normal?

    YES 

    Replace A/C auto amp. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair harness or connector.

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