WIRELESS DOOR LOCK CONTROL SYSTEM(w/o Entry and Start System) Only Wireless Control Function is Inoperative

DTC Code DTC Name
Only Wireless Control Function is Inoperative

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. The main body ECU then controls all the doors by sending lock/unlock signals to each door.

WIRING DIAGRAM

U123676E02

CAUTION / NOTICE / HINT

Note:

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

  • 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 (Click here).

PROCEDURE

  1. CHECK POWER DOOR LOCK OPERATION

    1. Check the power door lock operation (Click here).

      OK

      Each door locks and unlocks normally.

    Go to POWER DOOR LOCK CONTROL SYSTEM

    (Click here)

  2. CHECK KEY REMINDER WARNING OPERATION

    1. Check the key reminder buzzer operation (Click here).

      Tip:

      If the key reminder buzzer is functioning normally, it can be assumed that the unlock warning switch is also functioning normally.

      OK

      Key reminder buzzer operates normally.

    Go to KEY REMINDER WARNING SYSTEM

    (Click here)

  3. CHECK WIRELESS DOOR CONTROL TRANSMITTER

    1. Check whether the wireless door lock control functions operate normally with another registered transmitter.

      OK

      Wireless door lock control functions operate normally.

    CHECK FOR ELECTRICAL NOISEClick here

  4. CHECK TRANSMITTER BATTERY

    1. Remove the battery from the inoperative wireless door control transmitter (Click here).

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Battery positive (+) - Battery negative (-)

      Always

      2.5 to 3.2 V

    REPLACE DOOR CONTROL TRANSMITTER

    REPLACE TRANSMITTER BATTERY

    (Click here)

  5. CHECK FOR ELECTRICAL NOISE

    1. Move the transmitter in the vicinity of the door control receiver.

      Tip:

      Refer to Parts Location for the location of the door control receiver (Click here).

    2. Press and hold either the lock or unlock transmitter switch for 1 second, and check that the doors are locked or unlocked accordingly.

      OK

      Wireless door lock control functions operate normally.

      Tip:

      • Check if electrical noise is the cause by moving the door control transmitter closer to the door control receiver. Moving closer will decrease the effects of electrical noise.

      • If the operation check can be performed normally, there is a high probability that electrical noise or a decrease in output from the door control transmitter is the cause of the malfunction. There is a high probability that electrical noise is the cause if the problem occurs only in a certain location or only during a certain time of day. Also, custom components may be causing electrical noise. If custom components are installed in the vehicle, remove them and perform the operation check again.

    FIND CAUSE OF ELECTRICAL NOISE AND REMOVE IT

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)

    1. U122441E02

      Disconnect the H81 ECU connector.

    2. Disconnect the O14 receiver connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H81-5 (RDA) - O14-2 (RDA)

      Always

      Below 1 Ω

      H81-6 (PRG) - O14-3 (PRG)

      H81-5 (RDA) or O14-2 (RDA) - Body ground

      Always

      10 kΩ or higher

      H81-6 (PRG) or O14-3 (PRG) - Body ground
      Table 1. Text in Illustration

      *1

      Front view of wire harness connector

      (to Main Body ECU)

      *2

      Front view of wire harness connector

      (to Door Control Receiver)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - BATTERY AND BODY GROUND)

    1. U122440E02

      Disconnect the O14 receiver connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      O14-1 (GND) - Body ground

      Always

      Below 1 Ω

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      O14-5 (+B) - Body ground

      Always

      11 to 14 V
      Table 2. Text in Illustration

      *1

      Front view of wire harness connector

      (to Door Control Receiver)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK DOOR CONTROL RECEIVER (OUTPUT)

    1. E355535E01

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

      Standard Voltage

      Tester Connection

      Tool Setting

      Switch Condition

      Specified Condition

      O14-2 (RDA) - Body ground

      10 V/DIV., 50 μsec./DIV.

      No key in ignition key cylinder, all doors closed and transmitter switch off → on

      Pulse generation

      OK

      Door control receiver outputs a pulse.

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    REPLACE DOOR CONTROL RECEIVER

    (Click here)