WINDSHIELD DEICER SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01FR9HE12

    1. Disconnect the N78 air conditioning amplifier assembly connector.

    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
      N78-5 (IG+) - N78-1 (GND) L - W-B Power source (IG) Power switch on (IG) 11 to 14 V
      N78-5 (IG+) - N78-1 (GND) L - W-B Power source (IG) Power switch off Below 1 V
      N78-1 (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 N78 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
      N78-24 (FDEF) - N78-1 (GND) G - W-B Windshield deicer signal

      • Power switch on (IG)

      • Windshield deicer switch off

      		 11 to 14 V
      N78-24 (FDEF) - N78-1 (GND) G - W-B Windshield deicer signal

      • Power switch on (IG)

      • Windshield deicer switch on

      		 Below 2.2 V