WIRELESS DOOR LOCK CONTROL SYSTEM(w/o Smart Entry and Start System) No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the hazard warning light and wireless door lock buzzer answer-back functions do not operate. In such cases, hazard warning light and wireless door lock buzzer signal outputs from the main body ECU (multiplex network body ECU) may be malfunctioning.

WIRING DIAGRAM

A002CFME01

CAUTION / NOTICE / HINT

Note


  • The wireless door lock control system key and reminder warning system use the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.

    Click here

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), 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 (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here


    • *: for LHD

PROCEDURE


  1. READ VALUE USING GTS (Hazard Answer Back, Wireless Buzzer Resp, Wireless Buzzer Vol)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Customize Setting / Wireless Door Lock.

    5. Select the setting by referring to the table below.


      Wireless Door Lock
      Tester Display Description Default Setting ECU
      Hazard Answer Back Function that flashes the hazard warning lights once when the doors are locked by wireless operation and twice when the doors are unlocked by wireless operation. ON 0:OFF,1:ON Main body ECU (Multiplex network body ECU)
      Wireless Buzzer Resp Wireless door lock buzzer response* ON 0:OFF,1:ON Main body ECU (Multiplex network body ECU)
      Wireless Buzzer Vol Wireless door lock buzzer volume* Level5 0000:Level7,0001:Level6,0010:Level5,0011:Level4,0100:Level3,0101:Level2,0110:Level1,0111:Level0 Main body ECU (Multiplex network body ECU)

      • *: w/ Wireless Door Lock Buzzer Answer-back Function

      Result
      Result Proceed to
      Both items are ON and except Level 0 A
      Either item is OFF or Level 0 B

    B

    PERFORM CUSTOMIZE FUNCTION Click here

    A

  2. CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS


    1. Check the wireless door lock control function using the door control transmitter module set sub-assembly.

      Result
      Result Proceed to
      Wireless door lock/unlock operates properly A
      Wireless door lock/unlock does not operate properly B

    B

    GO TO PROBLEM SYMPTOMS TABLE Click here

    A

  3. READ VALUE USING GTS (FR Door Lock Pos, FL Door Lock Pos, RR-Door Lock Pos SW, RL-Door Lock Pos SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Lock Pos Front door RH unlock detection switch signal LOCK or UNLOCK

      LOCK: Front door RH locked

      UNLOCK: Front door RH unlocked

      		 -
      FL Door Lock Pos Front door LH unlock detection switch signal LOCK or UNLOCK

      LOCK: Front door LH locked

      UNLOCK: Front door LH unlocked

      		 -
      RR-Door Lock Pos SW Rear door RH unlock detection switch signal OFF or ON

      OFF: Rear door RH locked

      ON: Rear door RH unlocked

      		 -
      RL-Door Lock Pos SW Rear door RH unlock detection switch signal OFF or ON

      OFF: Rear door LH locked

      ON: Rear door LH unlocked

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Lock Pos
      FL Door Lock Pos
      RR-Door Lock Pos SW
      RL-Door Lock Pos SW
      OK
      The GTS display changes correctly in response to the lock/unlock operation.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) Click here

    OK

  4. CHECK WIRELESS ANSWER-BACK OPERATION


    1. Check the wireless answer-back operation using the door control transmitter module set sub-assembly.

      Result
      Result Proceed to
      Only wireless door lock buzzer answer-back does not occur A
      Only hazard warning light answer-back does not occur B

    B

    CHECK HAZARD WARNING LIGHTS OPERATION Click here

    A

  5. PERFORM ACTIVE TEST USING GTS (Wireless Buzzer)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Restrict Condition
      Wireless Buzzer Wireless door lock buzzer OFF/ON -

      Body Electrical > Main Body > Active Test
      Tester Display
      Wireless Buzzer
      Result
      Result Proceed to
      Wireless door lock buzzer does not turn on/off A
      Wireless door lock buzzer turns on/off B

    B

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

    A

  6. CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the A31 wireless door lock buzzer connector.

    2. Disconnect the 4F instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A31-1 (B) - 4F-30 Always Below 1 Ω
      A31-2 (E) - Body ground Always Below 1 Ω
      A31-1 (B) or 4F-30 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

      A0028W0C01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4F-30 - MB-21 (BZR) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  8. REPLACE WIRELESS DOOR LOCK BUZZER


    1. Temporarily replace the wireless door lock buzzer with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK WIRELESS DOOR LOCK BUZZER OPERATION


    1. Check the operation of the wireless answer-back function.

      Click here

      OK
      Wireless answer-back function operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (WIRELESS DOOR LOCK BUZZER WAS DEFECTIVE)

    NG

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

  10. CHECK HAZARD WARNING LIGHTS OPERATION


    1. Check that the hazard warning lights blink when the hazard warning signal switch is pressed.

      OK
      Hazard warning lights blink.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit) Click here