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

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 motor control circuit with the No. 2 air conditioning control assembly (rear blower switch).

WIRING DIAGRAM

B001ZOJE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. 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.


    NG

    REPLACE CLR RR RELAY

    OK

  2. 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.


    NG

    REPLACE REAR BLOWER WITH FAN MOTOR SUB-ASSEMBLY Click here

    OK

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


    1. B001VXHE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      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

      		 Below 1 V
      E81-18 (RCRL) - Body ground

      • Ignition switch ON

      • Heater control (blower switch): LO

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY)


    1. Disconnect the E165 air conditioning amplifier 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
      E165-27 (BLWH) - 8 Always Below 1 Ω
      E165-27 (BLWH) or 8 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the E182 No. 2 air conditioning control assembly connector.

    2. Disconnect the E165 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E182-1 (SG) - E165-7 (SG-5) Always Below 1 Ω
      E182-6 (S5) - E165-9 (S5-2) Always Below 1 Ω
      E182-4 (BSET) - E165-18 (BSET) Always Below 1 Ω
      E182-1 (SG) or E165-7 (SG-5) - Body ground Always 10 kΩ or higher
      E182-6 (S5) or E165-9 (S5-2) - Body ground Always 10 kΩ or higher
      E182-4 (BSET) or E165-18 (BSET) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY


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

    2. Disconnect the z52 rear blower motor control connector.

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

    4. Disconnect the z50 rear cooling unit expansion valve connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - z52-1 (+B) Always Below 1 Ω
      3 - z50-1 Always Below 1 Ω
      4 - z52-6 (GND) Always Below 1 Ω
      4 - z49-1 Always Below 1 Ω
      4 - z50-2 Always Below 1 Ω
      8 - z52-3 (SI) Always Below 1 Ω
      z49-2 - z52-2 (VM) Always Below 1 Ω
      1 or z52-1 (+B) - Body ground Always 10 kΩ or higher
      3 or z50-1 - Body ground Always 10 kΩ or higher
      8 or z52-3 (SI) - Body ground Always 10 kΩ or higher
      z49-2 or z52-2 (VM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - CLR RR RELAY AND BATTERY)


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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - Relay terminal-3 Always Below 1 Ω
      2 - Relay terminal-3 Always Below 1 Ω
      3 - or Relay terminal-3 - Body ground Always 10 kΩ or higher
      2 - or Relay terminal-3 - Body ground Always 10 kΩ or higher

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK REAR BLOWER MOTOR CONTROL


    1. Replace the rear blower motor control with a new or known good one Click here.

      OK
      Same problem does not occur.

    OK

    END (REAR BLOWER MOTOR CONTROL IS DEFECTIVE) (See page)

    NG

  9. CHECK NO. 2 AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace the No. 2 air conditioning control assembly with a new or known good one Click here.

      OK
      Same problem does not occur.

    OK

    END (NO.2 AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

    NG

  10. CHECK REAR COOLING UNIT EXPANSION VALVE


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

      Tech Tips

      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.

    OK

    END (REAR COOLING UNIT EXPANSION VALUVE IS DEFECTIVE)

    NG

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