STOP LIGHT CONTROL RELAY INSPECTION


  1. INSPECT STOP LIGHT CONTROL ECU ASSEMBLY


    1. A0040M5E08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Control ECU Assembly)

      Disconnect the A28 stop light control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A28-5 (STP) - Body ground Brake pedal released Below 1 V
      Brake pedal depressed 11 to 14 V
      A28-6 (+B) - Body ground Always 11 to 14 V

      If the result is not as specified, repair or replace the wire harness or connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A28-8 (GND) - Body ground Always Below 1 Ω

      If the result is not as specified, repair or replace the wire harness or connector.

    4. A0040TKE18
      Text in Illustration
      *a

      Component without harness connected

      (Stop Light Control ECU Assembly)

      Reconnect the A28 stop light control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A28-1 (OUT) - Body ground Brake pedal released Below 1 V
      Brake pedal depressed 11 to 14 V
      A28-4 (ESSI)*1 - Body ground Power switch off and brake pedal released Below 1 V
      Power switch off and brake pedal depressed 11 to 14 V
      A28-9 (ACC) - Body ground Power switch off 11 to 14 V

      • *1: w/ Emergency Brake Signal

      If the result is not as specified, the stop light control ECU assembly may have a malfunction.