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Wireless Door Lock Control System - Diagnosis: Pre-Check

  1. WIRELESS DOOR LOCK CONTROL SYSTEM DESCRIPTION 
    1. This system is a convenient system for locking and unlocking all the doors at a distance. The wireless control system has the following features:
      • In this system, the door control receiver performs the code identification process and the multiplex network body ECU operates the door lock control. A serial data link is provided for communication between the door control receiver and the multiplex network body ECU.
      • w/o Power back door:

        A key-integrated type transmitter is used and it contains the following 3 switches: the door lock switch, door unlock switch and panic switch.

      • w/ Power back door:

        A key-integrated type transmitter is used and it contains the following 3 switches: the door lock (panic) switch, door unlock switch and power back door switch.

      • A power window down function and a sliding roof (standard type only) open function are used in the wireless door lock control system.
      • A LED (Light Emitting Diode) is mounted on the transmitter to show if the battery is discharged.
    2. The wireless door lock control system has the following functions:
      FUNCTION OUTLINE

      Function Outline
      All door lock operation Pressing LOCK switch locks all doors
      All doors unlock operation (2-step unlock operation) Pressing UNLOCK switch twice within 3 seconds unlocks all doors after driver's door is unlocked
      Power back door open/close operation (w/ Power back door) Holding down power back door switch for longer than about 1 second opens or closes back door
      Power window and sliding roof (standard type only) open operation Holding down UNLOCK switch for longer than about 3 seconds opens all power windows and power sliding roof
      Answer-back operation Hazard lamps flash once when doors are locked and flash twice when doors are unlocked to inform that operation has been completed
      Wireless door lock buzzer sounds once when doors are locked and sounds twice when doors are unlocked to inform that operation has been completed
      When transmitter is used for opening/closing power back door or for opening a power window, this function causes the buzzer to sound (once for power window, twice for power back door) to inform that operation has been completed
      Panic alarm operation (w/o Power back door) Holding down the PANIC switch sets off theft deterrent alarm (the horn sounds, headlamps, taillamps and hazard lamps flash)
      Panic alarm operation (w/ Power back door) Holding down the LOCK switch for longer than about 2.5 seconds sets off theft deterrent alarm (the horn sounds, headlamps, taillamps and hazard lamps flash)
      Automatic lock function If none of doors are opened within 30 seconds after they are unlocked by wireless door lock remote control, all doors will lock again automatically
      Repeat function If a door is not locked in response to locking operation of transmitter, body ECU will output a lock signal after 1 second
      Illuminated entry function When all doors are locked, pressing door unlock switch causes interior lights to illuminate simultaneously with unlocking operation
      Security function Sends an operation signal as a rolling code
      Door ajar warning function If any door is open or ajar, pressing LOCK switch will cause wireless door buzzer to sound for about 10 seconds
      Transmitter recognition code registration function Enables registering (writing and storing) of 4 types of transmitter recognition codes in EERPOM that is built into body ECU
      Self-diagnosis If there is a malfunction in system, body ECU sets DTC in its memory
  2. DIAGNOSIS SYSTEM 
    1. Description
      1. Data of the system can be read in the Data Link Connector 3 (DLC3) of the vehicle.

        Therefore, when the system seems to be malfunctioning, use the hand-held tester to check for a malfunction and repair it.

    2. Inspect the DLC3.

      HINT:

      The vehicle's ECM uses ISO 9141-2 communication protocol.

      The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

      Fig 1: Inspecting DLC3
      G03487414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      7 (Bus + line) - 5 (Signal ground) During communication Pulse generation
      4 (Chassis ground) - Body ground Constant Below 1 Ω
      5 (Signal ground) - Body ground Constant Below 1 Ω
      16 (B+) - Body ground Constant 10 to 14 V

      HINT:

      If the screen displays UNABLE TO CONNECT TO VEHICLE after you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and used the hand-held tester, the problem may be on the vehicle side or tester side.

      • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.
    3. Check the battery voltage.

      Standard: 11 to 14 V 

      If the voltage is below 11 V, replace the battery before proceeding.

  3. CHECK DTC 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Read the DTC by following the prompts on the tester screen.

      HINT:

      Refer to the hand-held tester operator's manual for further details.

      Fig 2: Connecting Hand-Held Tester To DLC3
      G03487415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CLEAR DTC 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Erase the DTCs following the prompts on the tester screen.

      HINT:

      Refer to the hand-held tester operator's manual for further details.

  5. USING HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Monitor the ECU data by following the prompts on the tester screen.

      HINT:

      The hand-held tester has a "Snapshot" function which records the monitored data.

      Refer to the hand-held tester operator's manual for further details.

  6. DATA LIST 

    HINT:

    Using the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Read the DATA LIST according to the display on the tester.

      Standard (Multiplex network body ECU): 

      DATA LIST

      Item Measurement Item/Display (Range) Normal Condition Diagnostic Note
      IG SW Ignition switch signal/ON or OFF ON: Key is in ON or START position
      OFF: Key is in OFF or ACC position      		 -
      KEY UNLK WRN SW Unlock warning switch signal/ON or OFF ON: Key is in ignition key cylinder
      OFF: No key is in ignition key cylinder      		 -
      WIRELESS OPER Wireless door lock control function signal/ON or OFF ON: Wireless door lock function operates
      OFF: Wireless door lock function does not operate      		 -
      HAZARD ANS BACK Hazard answer-back of wireless signal/ON or OFF ON: Hazard answer-back of wireless operates
      OFF: Hazard answer-back of wireless does not operate      		 -
      OPEN DOOR WARN Open door warning signal/ON or OFF ON: Open door warning operates
      OFF: Open door warning does not operate      		 -
      AUTO LOCK DELAY Auto lock time signal/60s or 30s 60s: Door auto locking time is 60 sec.
      30s: Door auto locking time is 30 sec.      		 -
      UNLOCK/2 OPER 2 times operation wireless unlock signal/ ON or OFF ON: All doors unlock when wireless UNLOCK switch pressed twice
      OFF: All doors unlock when wireless UNLOCK switch pressed once      		 -
      ALARM FUNCTION Panic function signal/ON or OFF ON: Panic function operates
      OFF: Panic function does not operate      		 -
      WIRLS BUZZ RESP Wireless buzzer response signal/ON or OFF ON: Wireless buzzer response operates
      OFF: Wireless buzzer response does not operate      		 -
  7. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST using the hand-held tester allows you to operate the relay, VSV, actuator, etc. without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten the labor time.

    It is possible to display the DATA LIST during the ACTIVE TEST.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Perform the ACTIVE TEST according to the display on the tester.

      Standard (Multiplex network body ECU): 

      ACTIVE TEST CHART

      Item Test Detail Diagnostic Note
      HAZARD Turns turn signal flasher relay ON/OFF -
      BUZZ RESP SOUND Turns wireless buzzer ON/OFF -
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