DIFFERENTIAL SYSTEM(w/ Differential Lock) Lock Switch Circuit

WIRING DIAGRAM

B0028PYE18
*a Differential Lock Switch
*b Combination Meter Assembly
*c 4 Wheel Drive Control ECU
*d CAN Communication Line

PROCEDURE


  1. CHECK REAR DIFFERENTIAL LOCK INDICATOR LIGHT


    1. Turn the ignition switch to ON.

    2. except Pre-Runner:

      Finish switching to L4.

    3. Check the rear differential lock indicator light.

    4. Press the differential lock switch.

    5. After 60 seconds, check the rear differential lock indicator light.

      Result
      Result Proceed to
      Rear differential lock indicator light blinks or illuminates A
      Rear differential lock indicator light remains off regardless of switch operation B
      Rear differential lock indicator light remains illuminated regardless of switch operation C
      Rear differential lock indicator light rapidly blinks D

      • Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

      • Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)


    A

    END

    C

    CHECK CAN COMMUNICATION LINE Click here

    D

    GO TO DTC P17CC Click here

    B

  2. CHECK CAN COMMUNICATION LINE


    1. Select "Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

      for LHD without Central Gateway ECU: Click here

      for RHD without Central Gateway ECU: Click here

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      OK
      "Bus Check" indicates no malfunctions in CAN communication.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK CAN COMMUNICATION SYSTEM for LHD without Central Gateway ECU: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD without Central Gateway ECU: Click here
    CHECK CAN COMMUNICATION SYSTEM for LHD with Central Gateway ECU: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD with Central Gateway ECU: Click here

    OK

  3. READ VALUE USING GTS (DIFFERENTIAL LOCK SWITCH)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the GTS on.

    4. Turn the ignition switch to ON.

    5. Enter the following menus: Powertrain / Four Wheel Drive / Data List.

    6. According to the display on the GTS, read the Data List.


      Powertrain > Four Wheel Drive > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Differential Lock Control SW (R) Differential lock switch status (differential lock switch input signal of R terminal on ECU side) ON or OFF

      ON: Switch pressed and held

      OFF: Switch not pressed

      		 -

      Powertrain > Four Wheel Drive > Data List
      Tester Display
      Rear Differential Lock Control SW (R)
      OK
      Display changes according to differential lock switch operation.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT DIFFERENTIAL LOCK SWITCH Click here

    OK

  4. INSPECT COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Perform Active Test of the combination meter assembly using the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Indicat. Rr DIFF LOCK

    3. Check the combination meter assembly.

      OK
      The rear differential lock indicator light turns on or off in accordance with the GTS.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

    NG

    CHECK METER / GAUGE SYSTEM Click here

  5. INSPECT DIFFERENTIAL LOCK SWITCH


    1. Remove the differential lock switch.

      Click here

    2. Inspect the differential lock switch.

      Click here

      OK
      The differential lock switch operates normally.
      Result
      Result
      OK
      NG

    NG

    REPLACE DIFFERENTIAL LOCK SWITCH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - DIFFERENTIAL LOCK SWITCH)


    1. Disconnect the C39 4 wheel drive control ECU connector.

    2. Disconnect the G137 differential lock switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C39-15 (R) - G137-11 Always Below 1 Ω
      G137-8 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK CAN COMMUNICATION LINE


    1. Select "Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

      for LHD without Central Gateway ECU: Click here

      for RHD without Central Gateway ECU: Click here

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      OK
      "Bus Check" indicates no malfunctions in CAN communication.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK CAN COMMUNICATION SYSTEM for LHD without Central Gateway ECU: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD without Central Gateway ECU: Click here
    CHECK CAN COMMUNICATION SYSTEM for LHD with Central Gateway ECU: Click here
    CHECK CAN COMMUNICATION SYSTEM for RHD with Central Gateway ECU: Click here

    OK

  8. READ VALUE USING GTS (REAR DIFFERENTIAL LOCK INDICATOR LIGHT)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the GTS on.

    4. Turn the ignition switch to ON.

    5. Enter the following menus: Powertrain / Four Wheel Drive / Data List.

    6. According to the display on the GTS, read the Data List.


      Powertrain > Four Wheel Drive > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Differential Lock Indicator Request Rear differential lock indicator light request Blink4*, Blink3, Blink2, Blink1, ON or OFF

      • Blink3: Indicator light rapidly blinks

      • Blink2: Indicator light blinks 3 times

      • Blink1: Indicator light blinks

      • ON: Indicator light illuminates

      • OFF: Indicator light turns off

      • Blinking: 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

      • Rapidly blinking: 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

      *: Item not supported, therefore not displayed

      Powertrain > Four Wheel Drive > Data List
      Tester Display
      Rear Differential Lock Indicator Request

    7. except Pre-Runner:

      Finish switching to L4.

    8. Turn the differential lock switch on and off several times and check the GTS display condition of the rear differential lock indicator light.

      Result
      Result Proceed to
      Data List continues to display ON even when differential lock switch is operated A
      Data List display changes according to differential lock switch operation B

    A

    REPLACE 4 WHEEL DRIVE CONTROL ECU Click here

    B

    CHECK METER / GAUGE SYSTEM Click here