INTEGRATION RELAY ON-VEHICLE INSPECTION


  1. INSPECT NO. 2 INTEGRATION RELAY

    Note

    Both present and history signal readings will be cleared if the No. 2 integration relay is removed. Make sure not to remove it before inspection.

    Tech Tips


    • This is an inspection to check whether or not there is an electrical load malfunction (past or current) in the system connected to the No. 2 integration relay. This does not check if the No. 2 integration relay is functioning normally.

    • The No. 2 integration relay outputs signals by changing the voltage output from the diagnosis terminal.

    • If it is determined that there is a malfunction during the inspection of the integration relay, the malfunction is recorded as a history signal when the electrical load switch turns OFF.

    • After repairing the wire harness, make sure to disconnect the cable from the negative battery terminal to clear the signal readings.


    1. Inspect the diagnosis terminal (present signal reading).


      1. A01FU9GE02
        Text in Illustration
        *a

        Component with harness connected

        (No. 2 Integration Relay)
        *b Diagnosis Terminal 0

        Measure the voltage between the diagnosis terminal and body ground.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Diagnosis Terminal 0 - Body ground Power switch off, taillights illuminated

        (Battery voltage - 2.0 V) or higher (there is no malfunction)

        Battery voltage is 0.5 V or less (there is a malfunction)
        Power switch off, headlights illuminated*1
        Power switch off, fog lights illuminated*1
        Power switch off, brake lights illuminated
        Power switch on (IG)*2
        Power switch on (IG), daytime running lights illuminated*3
        Power switch on (IG), window defogger operating*3

        • *1 Check that there is no malfunction when the taillight switch is on.

        • *2 If there is a malfunction when the power switch is on (IG) and the electrical load switch is OFF, there may be a rear sunshade malfunction.

        • *3 Check that there is no malfunction when the power switch is on (IG) and the electrical load switch is OFF.

        Tech Tips


        • If the battery voltage is 0.5 V or less, there may be an electrical malfunction with the system connected to the No. 2 integration relay.

        • An abnormal present signal output can be cleared by disconnecting the cable from the negative battery terminal (waiting time of 1 minute).

    2. Inspect the diagnosis terminal (history signal reading).


      1. A01FUGQE03
        Text in Illustration
        *a

        Component with harness connected

        (No. 2 Integration Relay)
        *b Diagnosis Terminal 1

        Measure the resistance between the diagnosis terminal and body ground.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Diagnosis Terminal 1 - Body Ground Power switch off, taillights illuminated

        (Battery voltage - 2.0 V) or higher (there is no malfunction)

        Battery voltage is 0.5 V or less (there is a malfunction)
        Power switch off, headlights illuminated*1
        Power switch off, fog lights illuminated*1
        Power switch off, brake lights illuminated
        Power switch on (IG)*2
        Power switch on (IG), daytime running lights illuminated*3
        Power switch on (IG), window defogger operating*3

        • *1 Check that there is no malfunction when the taillight switch is on.

        • *2 If there is a malfunction when the power switch is on (IG) and the electrical load switch is OFF, there may be a rear sunshade malfunction.

        • *3 Check that there is no malfunction when the power switch is on (IG) and the electrical load switch is OFF.

        Tech Tips


        • If the battery voltage is 0.5 V or less, there may be an electrical malfunction with the system connected to the No. 2 integration relay.

        • An abnormal history signal output can be cleared by disconnecting the cable from the negative battery terminal (waiting time of 1 minute).

      2. A01FQ1EE02
        Text in Illustration
        *a

        Component without harness connected

        (No. 1 Engine Room Relay block assembly)

        If no signal readings are output, perform troubleshooting according to the following troubleshooting procedure.


        1. Remove the No. 2 integration relay Click here.

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

          Standard Voltage
          Tester Connection Switch Condition Specified Condition
          2B (IG1A) 8 - Body ground Power switch on (IG) 11 to 14 V
          2B (BATT) 7 - Body ground Always 11 to 14 V
          2G (ALT) 1 - Body ground Always 11 to 14 V

          Tech Tips

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