LIGHTING SYSTEM Interior Light Switch Signal Circuit

DESCRIPTION

The main body ECU RH receives information on the front interior light switch (marked ON/OFF).

The main body ECU LH receives information on the front interior light switch (marked DOOR).

According to the position of each switch, the main body ECU RH controls the interior lights, and the main body ECU LH controls the illuminated entry system.

WIRING DIAGRAM

A015Z2UE04

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / (desired system) / Data List.

    5. Read the display on the intelligent tester.

      Body (Main Body ECU RH)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination SW Front interior light switch (marked ON/OFF) signal / ON or OFF

      ON: Front interior light switch (marked ON/OFF) is pushed in

      OFF: Front interior light switch (marked ON/OFF) is not pushed in

      		 -
      Body No. 3 (Main Body ECU LH)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Interior Light Front interior light switch (marked DOOR) signal / ON or OFF

      ON: Front interior light switch (marked ON/OFF) is pushed in

      OFF: Front interior light switch (marked ON/OFF) is not pushed in

      		 -
      OK
      Switch condition can be displayed.
      Result
      Result Proceed to
      Indication for "Illumination SW" does not change A
      Indication for "Interior Light" does not change B
      Indications for both "Illumination SW" and "Interior Light" do not change C
      OK D

    A

    INSPECT OVERHEAD JUNCTION BLOCK Click here

    B

    INSPECT OVERHEAD JUNCTION BLOCK Click here

    C

    INSPECT OVERHEAD JUNCTION BLOCK Click here

    D

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. INSPECT OVERHEAD JUNCTION BLOCK


    1. A0161ONE14

      Remove the overhead junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      34 (CILL) - 18 (GND3) Front interior light switch (marked ON/OFF) is not pushed in 10 kΩ or higher
      34 (CILL) - 18 (GND3) Front interior light switch (marked ON/OFF) is pushed in Approx. 10 Ω

    NG

    REPLACE OVERHEAD JUNCTION BLOCK Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - MAIN BODY ECU RH)


    1. A0163ELE01

      Disconnect the R5 overhead junction block connector.

    2. Disconnect the J75 main body ECU RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R5-34 (CILL) - J75-4 (UL2) Always Below 1 Ω
      R5-34 (CILL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

  4. INSPECT OVERHEAD JUNCTION BLOCK


    1. A0161ONE15

      Remove the overhead junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      35 (DOOR) - 18 (GND3) Front interior light switch (marked DOOR) is not pushed in 10 kΩ or higher
      35 (DOOR) - 18 (GND3) Front interior light switch (marked DOOR) is pushed in Approx. 10 Ω

    NG

    REPLACE OVERHEAD JUNCTION BLOCK Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - MAIN BODY ECU LH)


    1. A0160ANE02

      Disconnect the R5 overhead junction block connector.

    2. Disconnect the Q3 main body ECU LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R5-35 (DOOR) - Q3-11 (BDCY) Always Below 1 Ω
      R5-35 (DOOR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

  6. INSPECT OVERHEAD JUNCTION BLOCK


    1. A0161ONE16

      Remove the overhead junction block.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      R5-35 (DOOR) - R5-18 (GND3) Front interior light switch (marked DOOR) is not pushed in 10 kΩ or higher
      R5-35 (DOOR) - R5-18 (GND3) Front interior light switch (marked DOOR) is pushed in Approx. 10 Ω
      R5-34 (CILL) - R5-18 (GND3) Front interior light switch (marked ON/OFF) is not pushed in 10 kΩ or higher
      R5-34 (CILL) - R5-18 (GND3) Front interior light switch (marked ON/OFF) is pushed in Approx. 10 Ω

    NG

    REPLACE OVERHEAD JUNCTION BLOCK Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (OVERHEAD JUNCTION BLOCK GROUND CIRCUIT)