LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the rear fog light relay.

WIRING DIAGRAM

A004ZOAE03
A004ZOAE04

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK OPERATION (TAILLIGHTS)


    1. Check the operation of the taillights.

      OK
      Taillights operation normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test.

    5. Check that the relay operates.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Rear Fog Light Relay Rear fog light relay ON/OFF Light control switch is in head position
      OK
      Rear fog light relay operates. (Rear fog light comes on.)

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  3. INSPECT RR FOG RELAY


    1. A004Z5IE02

      Remove the RR fog relay from the No. 4 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE RR FOG RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (RR FOG RELAY INPUT VOLTAGE)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay terminal 2 - Body ground Light control switch off → tail Below 1 V → 11 to 14 V
      Relay terminal 5 - Body ground Always 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (RR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (RR FOG RELAY - REAR FOG LIGHT ASSEMBLY)


    1. Disconnect the V9 and V2 rear fog light assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay Terminal 3 - V9-4 (B) Always Below 1 Ω
      Relay Terminal 3 - V2-4 (B) Always Below 1 Ω
      Relay Terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (RR FOG RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H17 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 1 - H17-20 (RFGO) Always Below 1 Ω
      Relay terminal 1 - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (RR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 2A and 2B instrument panel junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 5 - 2A-55 Always Below 1 Ω
      Relay terminal 2 - 2B-7 Always Below 1 Ω
      Relay terminal 5 - Body ground Always 10 kΩ or higher
      Relay terminal 2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR