HORN SYSTEM TERMINALS OF ECU


  1. CHECK FRONT LIGHT ECU (FRONT CONTROLLER)

    A000X8VE11

    1. Disconnect the A50 and A52 ECU connectors.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A50-1 (FMB3) - Body ground LG - Body ground +B power supply Always 11 to 14 V
      A50-5 (FMIG) - Body ground Y - Body ground IG power supply Power switch ON (IG) 11 to 14 V
      A52-1 (BATB) - Body ground P - Body ground +B power supply Always 11 to 14 V
      A52-5 (ALTB) - Body ground L - Body ground +B power supply Always 11 to 14 V
      A50-2 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A50 and A52 ECU connectors.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      B14-1 (HORL) - Body ground B - Body ground Horn (low pitched) signal Horn is sounding 11 to 14 V
      B14-2 (HORH) - Body ground B - Body ground Horn (high pitched) signal Horn is sounding 11 to 14 V

  2. CHECK STEERING PAD SWITCH ASSEMBLY

    A000ZOSE03

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      z74-12 - Body ground R - Body ground +B power supply Always 11 to 14 V