AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Cooling Box Control Switch Circuit

DESCRIPTION

The cooler control switch is the activation switch for the cooling box. If the cooling box does not activate when the cooler control switch is pushed, there may be a malfunction in the circuit shown below.

WIRING DIAGRAM

A01WZU6E06

PROCEDURE


  1. INSPECT FUSE (PANEL, A/C IG, ECU-B1)


    1. Remove the PANEL and A/C IG fuses from the cowl side junction block LH.

    2. Remove the ECU-B1 fuse from the engine room relay block.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      PANEL fuse Always Below 1 Ω
      ECU-B1 fuse Always Below 1 Ω
      A/C IG fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BATTERY)


    1. A01XAW6E47
      *1 Front view of wire harness connector: (to No. 1 Cooler Wiring Harness Sub-assembly)

      Disconnect the No. 1 cooler wiring harness sub-assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      4 (+B) - Body ground Always 11 to 14 V
      1 (B) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BODY GROUND)


    1. A01XAW6E48
      *1 Front view of wire harness connector: (to No. 1 Cooler Wiring Harness Sub-assembly)

      Disconnect the No. 1 cooler wiring harness sub-assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      6 (L) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY (OPERATION)


    1. Replace the No. 1 cooler wiring harness sub-assembly with a normal one and check that the condition returns to normal.

      OK
      Same problem does not occur.

    OK

    REPLACE NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY

    NG

  5. INSPECT COOLER CONTROL SWITCH SUB-ASSEMBLY


    1. A01X55GE02
      *1 Component with harness connected: (Cooler Control Switch Sub-assembly)

      Remove the cooler control switch sub-assembly Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 On Below 1 Ω
      1 - 2 Off 10 kΩ or higher

    3. Apply battery voltage to the cooler control switch connector and check that the cooler control switch illuminates.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 3

      Battery negative (-) → Terminal 4

      		 LED illuminates

      Battery positive (+) → Terminal 5

      Battery negative (-) → Terminal 6

      		 LED illuminates

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (for Cool Box) Click here

    NG

    REPLACE COOLER CONTROL SWITCH SUB-ASSEMBLY Click here