WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DTC Code DTC Name
Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the air conditioning control assembly is pressed, the rear window defogger wire becomes warm.

WIRING DIAGRAM

B371195E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK AIR CONDITIONING SYSTEM

    1. Check the air conditioning system.

      Tip:

      Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning control assembly via the same communication line.

      OK

      The air conditioning system operates normally.

    Result

    Proceed to

    OK

    NG
    NG

    GO TO AIR CONDITIONING SYSTEM

    Click here

    OK

  2. INSPECT DEFOGGER RELAY

    1. Remove the defogger relay from CTR relay block.

    2. Inspect the defogger relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE DEFOGGER RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY HOLDER - POWER SOURCE)

    1. B371213C01

      *1

      CTR Relay Block

      *a

      Defogger Relay Holder

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Defogger relay holder terminal-1 - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY HOLDER - BATTERY)

    1. B371213C01

      *1

      CTR Relay Block

      *a

      Defogger Relay Holder

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Defogger relay holder terminal-3 - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY HOLDER - AIR CONDITIONING CONTROL ASSEMBLY)

    1. B371213C01

      *1

      CTR Relay Block

      *a

      Defogger Relay Holder

      Disconnect the E26*1 or E54*2 air conditioning control assembly connector.

      • *1: for Manual Air Conditioning System

      • *2: for Automatic Air Conditioning System

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

      Standard Resistance

      Table 1. for Manual Air Conditioning System

      Tester Connection

      Condition

      Specified Condition

      Defogger relay holder terminal-2 - E26-4 (RDFG)

      Always

      Below 1 Ω

      Defogger relay holder terminal-2 or E26-4 (RDFG) - Body ground

      Always

      10 kΩ or higher
      Table 2. for Automatic Air Conditioning System

      Tester Connection

      Condition

      Specified Condition

      Defogger relay holder terminal-2 - E54-5 (RDFG)

      Always

      Below 1 Ω

      Defogger relay holder terminal-2 or E54-5 (RDFG) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK AIR CONDITIONING CONTROL ASSEMBLY

    1. B371251C01

      *A

      for Manual Air Conditioning System

      *B

      for Automatic Air Conditioning System

      *a

      Component with harness connected

      (Air Conditioning Control Assembly)

      Reconnect the E26*1 or E54*2 air conditioning control assembly connector.

      • *1: for Manual Air Conditioning System

      • *2: for Automatic Air Conditioning System

    2. Reinstall the defogger relay.

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

      Standard Voltage

      Table 3. for Manual Air Conditioning System

      Tester Connection

      Condition

      Specified Condition

      E26-4 (RDFG) - E26-7 (GND)

      Ignition switch ON, rear window defogger switch off

      11 to 14 V

      E26-4 (RDFG) - E26-7 (GND)

      Ignition switch ON, rear window defogger switch on

      Below 1 V
      Table 4. for Automatic Air Conditioning System

      Tester Connection

      Condition

      Specified Condition

      E54-5 (RDFG) - E54-12 (GND)

      Ignition switch ON, rear window defogger switch off

      11 to 14 V

      E54-5 (RDFG) - E54-12 (GND)

      Ignition switch ON, rear window defogger switch on

      Below 1 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY

    for Manual Air Conditioning System:Click here

    for Automatic Air Conditioning System:Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) - DEFOGGER RELAY HOLDER AND BODY GROUND)

    1. B371213C01

      *1

      CTR Relay Block

      *a

      Defogger Relay Holder

      Disconnect the O1 and O2 back door glass (rear window defogger wire) connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      O1-1 (B) - Defogger relay holder terminal-3

      Always

      Below 1 Ω

      O1-1 (B) or Defogger relay holder terminal-3 - Body ground

      Always

      10 kΩ or higher

      O2-1 (E) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE)

    1. Inspect the back door glass (rear window defogger wire).

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    NG

    REPAIR OR REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE)

    Click here