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AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Rear Air Conditioning Relay Circuit

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DTC Code DTC Name
  Rear Air Conditioning Relay Circuit
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DESCRIPTION

When the No. 2 air conditioning control assembly (rear blower switch) is set to position LO or higher, the contact of the CLR RR relay is closed, current flows to the rear blower motor, and the rear blower motor operates. The rear blower motor speed can be changed by exchanging the ground and the rear blower resistor circuit with the No. 2 air conditioning control assembly (rear blower switch).

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


  1. Click here

    INSPECT CLR RR RELAY


    1. Remove the CLR RR relay from the No.1 engine room relay block.

    2. Measure the CLR RR relay (Click here).


  2. Click here

    INSPECT REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    1. Remove the rear blower with fan motor sub-assembly (Click here).

    2. Measure the rear blower with fan motor sub-assembly (Click here).


  3. Click here

    INSPECT NO. 2 AIR CONDITIONING CONTROL ASSEMBLY (REAR BLOWER SWITCH)


    1. A01X5NSE03

      Remove the No. 2 air conditioning control assembly (Click here).

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      ALL - E89-6 (E) OFF 10 kΩ or higher
      E89-5 (LO) - E89-6 (E) LO Below 1 Ω
      E89-3 (M1) - E89-6 (E) M1 Below 1 Ω
      E89-4 (M2) - E89-6 (E) M2 Below 1 Ω
      E89-8 (HI) - E89-6 (E) HI Below 1 Ω

  4. Click here

    INSPECT REAR BLOWER RESISTOR


    1. Remove the rear blower resistor (Click here).

    2. Inspect the rear blower resistor (Click here).


  5. Click here

    CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)


    1. Replace the rear cooling unit expansion valve (Click here).

      Tip:

      Since the rear cooling unit expansion valve cannot be inspected while it is removed from the vehicle, replace the rear cooling unit expansion valve with a normal one and check that the condition returns to normal.

      OK
      Same problem does not occur.

  6. Click here

    CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY)


    1. Disconnect the wiring air conditioning harness sub-assembly connector.

    2. Disconnect the z52 rear blower resistor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6 (M1) - z52-2 (M1) Always Below 1 Ω
      5 (M2) - z52-3 (M2) Always Below 1 Ω
      4 (HI) - z52-1 (HI) Always Below 1 Ω
      7 (LO) - z52-4 (LO) Always Below 1 Ω
      6 (M1) or z52-2 (M1) - Body ground Always 10 kΩ or higher
      5 (M2) or z52-3 (M2) - Body ground Always 10 kΩ or higher
      4 (HI) or z52-1 (HI) - Body ground Always 10 kΩ or higher
      7 (LO) or z52-4 (LO) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY)


    1. Disconnect the E89 No. 2 air conditioning control assembly connector.

    2. Disconnect the Wiring air conditioning harness sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E89-3 (M1) - 6 (M1) Always Below 1 Ω
      E89-4 (M2) - 5 (M2) Always Below 1 Ω
      E89-8 (HI) - 4 (HI) Always Below 1 Ω
      E89-5 (LO) - 7 (LO) Always Below 1 Ω
      E89-6 (E) - Body ground Always Below 1 Ω
      E89-3 (M1) or 6 (M1) - Body ground Always 10 kΩ or higher
      E89-4 (M2) or 5 (M2) - Body ground Always 10 kΩ or higher
      E89-8 (HI) or 4 (HI) - Body ground Always 10 kΩ or higher
      E89-5 (LO) or 7 (LO) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    CHECK HARNESS AND CONNECTOR (REAR BLOWER RESISTOR - REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY)


    1. Disconnect the z52 rear blower resistor connector.

    2. Disconnect the z49 rear blower with fan motor sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z52-1 (HI) - z49-1 Always Below 1 Ω
      z52-1 (HI) or z49-1 - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

    CHECK HARNESS AND CONNECTOR (REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY - BODY GROUND AND BATTERY)


    1. A01X651E02

      Disconnect the rear blower with fan motor sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z49-2 - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z49-2 - Body ground

      Ignition switch ON

      Heater control (blower switch) HI

      		 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Rear Blower with Fan Motor Sub-assembly)

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY AND BODY GROUND)


    1. B001VXHE02

      Disconnect the air conditioning amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E81-14 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E81-18 (RCRL) - Body ground

      • Ignition switch ON

      • Heater control (blower switch): OFF

      		 11 to 14 V
      E81-18 (RCRL) - Body ground

      • Ignition switch ON

      • Heater control (blower switch): ON

      		 Below 1 V
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

    • OK

      PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR