Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: System Description

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Power Door Lock Control System / System Description

SYSTEM DESCRIPTION

1. POWER DOOR LOCK CONTROL SYSTEM DESCRIPTION

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

The main body ECU (multiplex network body ECU) receives lock/unlock request signals from a door control switch or the driver door key lock and unlock switch. Then, the main body ECU (multiplex network body ECU) sends these request signals to the door lock motors in each door to lock/unlock each door in response to the inputs.

2. FUNCTION OF MAIN COMPONENTS

Component

Function

Power window regulator master switch assembly

  • Door control switch

The door control switch on the power window regulator master switch assembly locks or unlocks all doors.

Front door courtesy light switch assembly LH

Front door courtesy light switch assembly RH

Rear door courtesy light switch assembly LH*1

Rear door courtesy light switch assembly RH*1

Upper access panel lock assembly LH*2

Upper access panel lock assembly RH*2

Lower access panel lock assembly LH*2

Lower access panel lock assembly RH*2
  • Placed on each door.
  • Detects the door status (open or closed) and outputs data to the body ECU.
  • Turns on when the door is opened and turns off when the door is closed.

Front door lock assembly LH
  • The built-in motor locks or unlocks the door.
  • The built-in key cylinder lock and unlock switch (key-linked) detects the door key operation status (locked or unlocked) and outputs a signal to the body ECU.
  • The built-in unlock detection switch detects the door status (locked or unlocked) and outputs a signal to the body ECU. This switch turns off when the door is locked and turns on when the door is unlocked.

Front door lock assembly RH

Rear door lock assembly LH*1

Rear door lock assembly RH*1

The built-in motor locks or unlocks the door.
  • *1: for Double Cab
  • *2: for Access Cab

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 power door lock control system has the following functions:

Function

Outline

Manual lock and unlock function

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

Key-linked lock and unlock function

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

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, wireless key operation or smart key operation*1 with all doors closed.

Key lock-in prevention function

When the key is in the vehicle*1 or ignition key cylinder*2, performing the door lock operation will not lock the door.

Key-linked 2-step unlock function

Unlocks only the driver door by turning the key cylinder once and unlocks the other doors by turning it twice.

Shift-linked automatic door lock function

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

  • All doors are closed.
  • The ignition switch is ON.
  • With the shift lever in P, the shift lever is moved to any position other than P.
  • Any of the doors is unlocked.

Shift-linked automatic door unlock function

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

  • The ignition switch is ON.
  • With the shift lever in any position other than P, the shift lever is moved to P.

Speed-sensitive automatic door lock function

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

  • Vehicle speed is higher than approximately 20 km/h (12 mph).
  • All doors are closed.
  • Any of the doors is unlocked.

Driver door-linked automatic door unlock

All doors are unlocked automatically when the driver door is opened within approximately 43 seconds after the ignition switch is turned from ON to off.
  • *1: w/ Smart Key System.
  • *2: w/o Smart Key System.
Precaution
PRECAUTION 1. IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are u ...

System Diagram
SYSTEM DIAGRAM Communication Table Sender Receiver Signal Communication Method Power window regulator master switch assembly*1 ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. INSPECT SHIFT SOLENOID VALVE SL1 (a) Measure the resistance according to the value(s) in the table below. Text in Illustration *a Component without harness connected (Shift Solenoid Valve SL1) Standa ...

Components
COMPONENTS ILLUSTRATION HINT: The following specifications are for BD20D (w/o Differential Lock). BD20D differentials are equipped with M8 rear differential carrier to rear axel housing fasteners. ILLUSTRATION ILLUSTRATION ...

System Description
SYSTEM DESCRIPTION 1. LIN COMMUNICATION SYSTEM DESCRIPTION The LIN communication system is used for communication between the components in the tables below. If communication cannot be performed through LIN communication because of an open in the communication lines or other reasons, the maste ...

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