WINDOW DEFOGGER SYSTEM TERMINALS OF ECU

  1. CHECK HEATER CONTROL SUB-ASSEMBLY (for Manual Air Conditioning System)

    U122375E02

    1. Disconnect the H65 heater control connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      H65-3 (IG+) - H65-5 (E)

      Y - W-B

      Power source (IG)

      Ignition switch ON

      11 to 14 V

      H65-3 (IG+) - H65-5 (E)

      Ignition switch off

      Below 1 V

      H65-5 (E) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      • If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the H65 heater control connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      H65-2 (RDEF) - H65-5 (E)

      B - W-B

      Rear defogger signal

      Ignition switch ON, rear window defogger switch off

      11 to 14 V

      H65-2 (RDEF) - H65-5 (E)

      Ignition switch ON, rear window defogger switch on

      Below 1 V

      • If the result is not as specified, there may be a malfunction in the heater control.

  2. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    U123687E02

    1. Disconnect the H46 air conditioning amplifier connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      H46-1 (IG+) - H46-14 (GND)

      Y - W-B

      Power source (IG)

      Ignition switch ON

      11 to 14 V

      H46-1 (IG+) - H46-14 (GND)

      Ignition switch off

      Below 1 V

      H46-21 (B) - H46-14 (GND)

      W - W-B

      Power source (Back-up)

      Always

      11 to 14 V

      H46-14 (GND) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      • If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the H46 air conditioning amplifier connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      H46-38 (RDFG) - H46-14 (GND)

      B - W-B

      Rear defogger signal

      Ignition switch ON, rear window defogger switch off

      11 to 14 V

      H46-38 (RDFG) - H46-14 (GND)

      Ignition switch ON, rear window defogger switch on

      Below 1 V

      • If the result is not as specified, there may be a malfunction in the air conditioning amplifier.

  3. CHECK AIR CONDITIONING CONTROL ASSEMBLY (for Automatic Air Conditioning System)

    U122505E02

    1. Disconnect the H21 air conditioning control connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      H21-2 (IG+) - H21-5 (GND)

      R - BR

      Power source (IG)

      Ignition switch ON

      11 to 14 V

      H21-2 (IG+) - H21-5 (GND)

      Ignition switch off

      Below 1 V

      H21-5 (GND) - Body ground

      BR - Body ground

      Ground

      Always

      Below 1 Ω

      • If the result is not as specified, there may be a malfunction in the wire harness.

  4. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    B217123E01

    1. Disconnect the DG main body ECU connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      DG-1 - Body ground

      W - Body ground

      Power source

      Always

      11 to 14 V

      • If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the DG main body ECU connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      DQ-12 - Body ground

      B - Body ground

      DEF relay operation signal

      Ignition switch ON, rear window defogger switch off

      11 to 14 V

      DQ-12 - Body ground

      Ignition switch ON, rear window defogger switch on

      Below 1 V

      DF-2 - Body ground

      B - Body ground

      Defogger wire operation signal

      Ignition switch ON, rear window defogger switch off

      Below 1 V

      DF-2 - Body ground

      Ignition switch ON, rear window defogger switch on

      11 to 14 V

      • If the result is not as specified, there may be a malfunction in the main body ECU.