SEAT BELT WARNING SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY


    1. Disconnect the D7 combination meter assembly connector.

      A004ITAE03

    2. Measure the resistance and voltage 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
      D7-1 (B) - Body ground R-W - Body ground Combination meter +B line Always 11 to 14 V
      D7-2 (IG+) - Body ground W-G - Body ground Combination meter IG line Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      D7-20 (ES1) - Body ground B-Y - Body ground Ground Always Below 1 Ω
      D7-37 (DBKL) - Body ground R-B - Body ground Driver seat belt signal Driver seat belt fastened 10 kΩ or higher
      Driver seat belt unfastened Below 1 Ω
      D7-38 (PBKL) - Body ground R-G - Body ground Front passenger seat belt signal Front passenger seat occupied, seat belt fastened 10 kΩ or higher
      Front passenger seat occupied, seat belt unfastened Below 1 Ω
      D7-40 (ES2) - Body ground B-Y - 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 D7 combination meter assembly connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      D7-13 (P/SB) - Body ground BR-R - Body ground Front passenger seat belt warning signal Front passenger seat occupied, seat belt fastened Below 1 V
      Front passenger seat occupied, seat belt unfastened 11 to 14 V

      If the result is not as specified, the combination meter assembly may have a malfunction.