LIGHTING SYSTEM Illumination Circuit

DESCRIPTION

The main body ECU receives information regarding all the door courtesy light switches and door lock position switches, and turns on the room light.

WIRING DIAGRAM

A004QEXE04

CAUTION / NOTICE / HINT

Note

As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure.

Tech Tips

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Turn the map light switch to the DOOR position.

    5. Close all the doors (all door courtesy light switches turn off).

    6. Enter the following menus: Body / Main Body / Active Test / Illuminated Entry System.

    7. Use the Active Test to check the operation of the illuminated entry system.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Illuminated Entry System All parts illuminated by illuminated entry system ON or OFF -
      OK
      The illuminated entry system operates normally when operating it using the Active Test.

    OK

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

    NG

  2. INSPECT MAP LIGHT ASSEMBLY


    1. A004RGXE02

      Remove the map light assembly Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      8 (+B1) - 3 (CTY)

      Map light switch off

      Door switch not in door position

      		 10 kΩ or higher
      8 (+B1) - 3 (CTY)

      Map light switch off

      Door switch in door position

      		 Below 1 Ω
      8 (+B1) - 11 (GND) Map light switch on Below 1 Ω
      8 (+B1) - 11 (GND) Map light switch off 10 kΩ or higher
      3 (CTY) - 7 (RRMP) Door switch not in door position 10 kΩ or higher
      3 (CTY) - 7 (RRMP) Door switch in door position Below 1 Ω

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT - MAIN BODY ECU, BATTERY AND BODY GROUND)


    1. A004UBFE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Map Light Assembly)
      *2

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the DK main body ECU connector.

    2. Disconnect the K15 map light connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K15-8 (+B1) - Body ground Battery saving control (interior light auto cut function) not operating 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      K15-3 (CTY) - DK-2 (ILE) Always Below 1 Ω
      K15-3 (CTY) - Body ground Always 10 kΩ or higher
      K15-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT NO. 1 ROOM LIGHT ASSEMBLY


    1. A004PEZE04

      Remove the No. 1 room light assembly Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      4 (B) - 3 (E) Off 10 kΩ or higher
      4 (B) - 2 (CTY) Off Below 1 Ω
      4 (B) - 3 (E) On Below 1 Ω
      4 (B) - 2 (CTY) On 10 kΩ or higher

    NG

    REPLACE NO. 1 ROOM LIGHT ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 1 ROOM LIGHT - MAP LIGHT, BATTERY AND BODY GROUND)


    1. A004NLHE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Map Light Assembly)
      *2

      Front view of wire harness connector

      (to No. 1 Room Light Assembly)

      Disconnect the K15 map light connector.

    2. Disconnect the K8 No. 1 room light connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K8-4 (B) - Body ground Battery saving control (interior light auto cut function) not operating 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      K8-2 (CTY) - K15-7 (RRMP) Always Below 1 Ω
      K8-2 (CTY) - Body ground Always 10 kΩ or higher
      K8-3 (E) - Body ground Always Below 1 Ω

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR