Toyota Tundra Service Manual: System Description

SYSTEM DESCRIPTION

1. POWER DOOR LOCK CONTROL SYSTEM DESCRIPTION

(a) The power door lock control system locks/unlocks all the doors.

The power window regulator master switch assembly (door control switch assembly LH) and the door control switch assembly RH on the front passenger door send "lock/unlock" request signals to the main body ECU (multiplex network body ECU). Then, the main body ECU (multiplex network body ECU) sends these request signals to the lock motors in each door to lock/unlock all the doors at once in response to the inputs.

Operating the driver's door using a mechanical key sends request signals to lock/unlock the doors to the main body ECU (multiplex network body ECU).

2. FUNCTION OF MAIN COMPONENT

Component

Function

Power window regulator master switch assembly (door control switch assembly LH)

Door control switch on power window regulator master switch locks/unlocks all doors.

Door control switch assembly RH

Door control switch assembly on front passenger side locks/unlocks all doors.

Courtesy light switch

Provided for each door. Detects door status (open or closed) and outputs data to main body ECU (multiplex network body ECU). Turns on when door is opened and turns off when door is closed.

Front door lock assembly LH

  • Built-in motor locks/unlocks door.
  • Built-in door control switch (key-linked) detects door key operation's door status (locked or unlocked) and outputs data to main body ECU (multiplex network body ECU).
  • Built-in position switch detects door status (locked or unlocked) and outputs data to main body ECU (multiplex network body ECU). This switch turns off when door is locked and turns on when door is unlocked.

Front door lock assembly RH

  • Built-in motor locks/unlocks door.
  • Built-in position switch detects door status (locked or unlocked) and outputs data to main body ECU (multiplex network body ECU). This switch turns off when door is locked and turns on when door is unlocked.
  • Rear door lock assembly LH
  • Rear door lock assembly RH
  • Built-in motor locks/unlocks door.
  • Built-in position switch detects door status (locked or unlocked) and outputs data to main body ECU (multiplex network body ECU). This switch turns off when door is locked and turns on when door is unlocked.

3. SYSTEM FUNCTION

(a) This system is controlled by the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) outputs signals to each door lock motor. The door lock control system of the vehicle has the following functions:

Function

Outline

Manual lock and unlock function

This function can lock or unlock all doors by the door lock control switch operation.

Key-linked lock and unlock function

This function, which is linked with the mechanical key cylinder, can lock or unlock all the doors when a lock or unlock operation is affected.

Manual unlock prohibition function

When the condition below is met, unlocking the vehicle using the door control switch will be prohibited:

  • The doors are locked using a key-linked operation or wireless key operation with all doors closed.

Key lock-in prevention function

If driver's door lock operation is performed when the mechanical key is in the ignition key cylinder, all the doors will be unlocked.

Shift-linked automatic door lock function

When the conditions listed below are met consecutively, this function causes all the doors to be automatically locked.

  • Turn the ignition switch to ON.
  • All doors are closed.
  • The shift lever is moved out of P.
  • Any of the doors is unlocked.

Shift-linked automatic door unlock function

When the ignition switch is ON, and the shift lever is moved to P from any other position, all the doors will be automatically unlocked.

2-step unlock function

This function is provided to unlock the driver's door by turning the key cylinder once and to unlock the remaining doors by turning it twice.

Speed-sensitive automatic door lock

When conditions listed below are all met, this function causes all doors to automatically lock.

  • Vehicle speed is higher than approximately 20 km/h (13 mph).
  • All doors are closed.
  • The shift lever is moved to any position other than P or N.
  • Any one of the doors is unlocked.

Opening driver's door-linked automatic door unlock

All doors are unlocked automatically when the driver's door is opened within 45 seconds after the ignition switch is turned off from ON.

    Problem Symptoms Table

    System Diagram

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