HEATED WINDSHIELD DEFROSTER SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Disconnect the I77 air conditioning amplifier assembly connector.

      A01ETKIE18

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

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Engine switch on (IG) 11 to 14 V
      I77-1 (IG+) - I77-14 (GND) B - W-B Power source (IG) Engine switch off Below 1 V
      I77-21 (B) - I77-14 (GND) Y - W-B Battery power supply Always 11 to 14 V
      I77-14 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the I77 air conditioning amplifier assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I77-19 (FDEF) - I77-14 (GND) P - W-B HWD NO. 1 relay Engine start on (Start), Front window deicer switch off 11 to 14 V
      I77-19 (FDEF) - I77-14 (GND) P - W-B HWD NO. 1 relay Engine start on (Start), Front window deicer switch on Below 1V
      I77-23 (IND) - I77-14 (GND) W - W-B Front window deicer switch indicator signal Engine switch on (IG), Front window deicer switch off 11 to 14 V
      I77-23 (IND) - I77-14 (GND) W - W-B Front window deicer switch indicator signal Engine switch on (IG), Front window deicer switch on Below 1 Ω
      I77-24 (DFAC) - I77-14 (GND) W-B - W-B Front window deicer switch signal Engine switch on (IG), Front window deicer switch off Below 1 Ω
      I77-24 (DFAC) - I77-14 (GND) W-B - W-B Front window deicer switch signal Engine switch on (IG), Front window deicer switch on 11 to 14 V