HEATED WINDSHIELD DEFROSTER SYSTEM TERMINALS OF ECU

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for Automatic Air Conditioning System)

    1. Disconnect the G81 air conditioning amplifier assembly connector.

      E238082E06

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

      Tip:

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      G81-1 (IG+) - G81-14 (GND)

      GR - W-B

      Power source (IG)

      Power switch on (IG)

      11 to 14 V

      G81-1 (IG+) - G81-14 (GND)

      GR - W-B

      Power source (IG)

      Power switch off

      Below 1 V

      G81-21 (B) - G81-14 (GND)

      GR - W-B

      Power source (+B)

      Always

      11 to 14 V

      G81-14 (GND) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

    3. Reconnect the G81 air conditioning amplifier assembly connector.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Tester Connection

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      G81-19 (FDEF) - G81-14 (GND)

      V - W-B

      Heated windshield defroster signal

      Power switch on (IG), front window deicer switch off

      11 to 14 V

      G81-19 (FDEF) - G81-14 (GND)

      V - W-B

      Heated windshield defroster signal

      Power switch on (IG), front window deicer switch on

      Below 1 V

      G81-37 (LIN1) - G81-14 (GND)

      B - W-B

      LIN communication line

      Power switch on (IG)

      Pulse generation