WINDOW DEFOGGER SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A000S15E03

    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.

      Tester Connection 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.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      N78-25 (RDEF) - N78-1 (GND) R - W-B Rear window defogger signal

      • Power switch on (IG)

      • Rear window defogger switch off

      		 11 to 14 V
      N78-25 (RDEF) - N78-1 (GND) R - W-B Rear window defogger signal

      • Power switch on (IG)

      • Rear window defogger switch on

      		 Below 2.2 V