Toyota Tundra Service Manual: System Description

SYSTEM DESCRIPTION

  • The theft deterrent system can be set/canceled by locking/unlocking the doors performing any of the following operation:
    • Wireless lock/unlock operation
    • Key linked lock/unlock operation
    • By opening and closing the doors*
      • *: Only when setting the theft deterrent system.
  • The alarm function will be activated when someone attempts to forcibly unlock any of the doors or open any of the doors or engine hood while the system is in the armed state.
  • In the alarm sounding state, the system illuminates the interior light and blinks the turn signal lights, the headlights and taillights. At the same time, the system sounds the vehicle horns and security horn assembly to deter break-in and theft as well as to warn people around the vehicle.

    HINT:

    The interior light is illuminated if the interior light door switch in the map light assembly is on.

  • The theft deterrent system has an active arming mode. There are 4 states in this mode; a disarmed state, an arming preparation state, an armed state and an alarm sounding state.

OUTLINE OF THEFT DETERRENT SYSTEM

(a) Disarmed state:

  • The alarm function is not operating.
  • The theft deterrent system is not operating.

(b) Arming preparation state:

  • The time until the system goes into the armed state.
  • The theft deterrent system is not operating.

(c) Armed state:

  • The theft deterrent system is operating.

(d) Alarm sounding state:

  • The alarm function is operating.

Alarm time:

approximately 57 seconds

Alarm Methods and Time

Alarm Method

Headlights

Blinking

Taillights

Blinking

Turn Signal Lights

Blinking

Interior Light

Illuminating

Vehicle Horns

Sounding

(approximately 0.4-second cycles)

Security Horn Assembly

Sounding

(approximately 0.4-second cycles)

Alarm Time

Approximately 57 seconds

FUNCTION OF MAIN COMPONENTS

Component

Function

Security indicator light

Informs driver of theft deterrent system status.

Security horn assembly

Sounds when attempted break-in or theft is detected.

Headlights

Blink when attempted break-in or theft is detected.

Turn signal lights

Blink when attempted break-in or theft is detected.

Interior light

Comes on when attempted break-in or theft is detected.

Vehicle horns

Sound when attempted break-in or theft is detected.

  • Front courtesy light switch (for LH/RH)
  • Rear courtesy light switch (for LH/RH)

Detects door status (open or closed).

Door unlock detection switch

Detects door status (locked or unlocked).

Engine hood courtesy switch (hood lock assembly)

Detects engine hood status (open or closed).

Main body ECU (multiplex network body ECU)

Receives wireless door lock/unlock signal.

Glass breakage sensor ECU*

Outputs an alarm request signal to the main body ECU (multiplex network body ECU) when the sound of glass breaking is detected.

  • *: w/ Glass Breakage Sensor

ACTIVE ARMING MODE

(a) Active arming mode:

This system operates as described in the diagram below when one of the items for each condition is met.

HINT:

The term "all doors" used in this section refers to the driver door, front passenger door, rear door LH and rear door RH.

Condition

Item

Condition [1]

In disarmed state 1, when the ignition switch is off and the key is not in the key cylinder, the system state is switched if the following condition is met:

  • With all doors and the engine hood closed, all doors are locked by wireless operation or key linked power door lock operation.

In disarmed state 1, when the ignition switch is off, the key is not in the key cylinder, the engine hood is closed and all doors are locked, the system state is switched if the following condition is met:

  • The state changes from any of the doors being opened to all doors being closed.

Condition [2]

  • Allow approximately 30 seconds to elapse.

Condition [3]

One of the following conditions is met:

  • All doors are unlocked by wireless operation or key linked power door lock operation.
  • Any door is unlocked.
  • Any door is opened.
  • The key is inserted to the key cylinder.
  • The battery is reconnected.

Condition [4]

One of the following conditions is met:

  • The engine hood is opened when the engine hood is closed.
  • Any door is opened when all doors are closed.
  • Any door is unlocked when all doors are locked.
  • The glass breakage sensor detects that glass is broken.*

    HINT:

    When the glass breakage sensor detects the glass is broken (1st time), the sensor will set off an alarm for 20 seconds (pre-alarm). If the glass breakage sensor detects that more glass is broken (2nd time or more), the system state is switched to the alarm sounding state. If the glass breakage sensor does not detect 2nd glass breakage and 20 seconds elapse from 1st time, the system state stays the armed state.

  • The ignition switch is turned to ON when the key is not in the key cylinder.

Condition [5]

One of the following conditions is met:

  • The ignition switch is turned to ON and the engine is running at 550 rpm for more than 2 seconds.
  • All doors are unlocked by wireless operation or key linked power door lock operation.
  • The ignition switch is turned to ACC or ON when the key is in the key cylinder.

Condition [6]

  • After approximately 57 seconds, the alarm stops and the system returns to the armed state.

Condition [7]

  • The engine hood is closed with all the doors closed.

Condition [8]

One of the following conditions is met:

  • Any door is unlocked when all doors are locked.
  • Any door is opened.
  • The ignition switch is turned to ACC or ON.
  • The battery is reconnected.
  • All doors are unlocked by wireless operation or key linked power door lock operation.

Condition [9]

In disarmed state 1, when the ignition switch is off and the key is not in the key cylinder, the system state is switched if the following condition is met:

  • With all doors closed and the engine hood open, all doors are locked by wireless operation or key linked power door lock operation.

In disarmed state 1, when the ignition switch is off, the engine hood is open and all doors are locked, the system state is switched if the following condition is met:

  • The state changes from any of the doors being opened to all doors being closed.

Condition [10]

  • The engine hood is opened.
  • *: w/ Glass Breakage Sensor

FORCED DOOR LOCK CONTROL

(a) The forced door lock control prevents the vehicle from being tampered with. Immediately after a door is unlocked (armed state), all doors are forced to lock by a forced door lock signal.

(1) If the following conditions are met, the forced door lock control is operated.

  • The theft deterrent system is in the armed state.
  • Any door is unlocked.

ALARM MEMORY FUNCTION

(a) If the alarm is set off (tampering is detected) while the theft deterrent system is in the armed state, it will be stored by the alarm memory function. Whenever the theft deterrent system is canceled, the alarm memory function causes the taillights to light up for 2 seconds in order to inform the user that the alarm has been set off.

(1) Condition that cause the taillights to light up for 2 seconds:

The theft deterrent system has entered the alarm sounding state (tampering has been detected) at least once.

HINT:

Active arming mode: See Active Arming Mode.

PANIC ALARM CONTROL

(a) Panic alarm control makes it possible to voluntarily set off the panic alarm by pressing the panic switch on the electrical key transmitter sub-assembly.

(1) Conditions that cause panic alarm control to set off the panic alarm:

The panic switch on the electrical key transmitter sub-assembly is pressed under the following conditions:

  • The ignition switch is off.
  • The theft deterrent system is not in the alarm sounding state.

(2) Conditions that cause the panic alarm control to shut off the alarm:

Any of the following conditions is met during panic alarm control operation:

  • The ignition switch is turned to ON.
  • The panic switch is pressed again.
  • Any of the switches on the electrical key transmitter sub-assembly (lock/unlock) is pressed.
  • The panic alarm ends (approximately 57 seconds have elapsed).
  • The theft deterrent system switches to the alarm sounding state. Under this condition, the theft deterrent system controls the alarm rather than the panic alarm control. In order to cancel this alarm, refer to the theft deterrent system alarm sounding state cancellation procedure.

SECURITY INDICATOR LIGHT OUTPUT

(a) According to the state of the theft deterrent system, the main body ECU (multiplex network body ECU) outputs a signal to turn the security indicator light on. However, some of the actual lighting conditions of the security indicator light are different from the output signals of the main body ECU (multiplex network body ECU).

Output

State of Theft Deterrent System

Security Indicator Light

Output Signal from Main Body ECU (Multiplex Network Body ECU)

Actual Lighting Condition

Disarmed state (1), (2)

Off

  • Off (Engine immobiliser system unset)
  • Blinking (Engine immobiliser system set)

Arming preparation state

On

On

Armed state

Off

Blinking

Alarm sounding state

On

On

Blinking Cycle

Time

Security Indicator Light

0.125 seconds

On

1.875 seconds

Off

HINT:

When the engine immobiliser system is set, the security indicator light blinks during both the disarmed state and the armed state due to output signals from the engine immobiliser system.

    Security Indicator Light Circuit

    System Diagram

    See More:

    Toyota Tundra Service Manual > Engine Immobiliser System (w/o Smart Key System): Transponder Chip Malfunction (B2793,B2794,B2797,B2798)
    DESCRIPTION DTC B2793 is stored when a malfunction is found in the key during key ID code registration or a key ID code is not registered normally. Replace the key if key ID code registration cannot be performed normally and this DTC is output. DTC B2794 is stored when a key with an incomplete key I ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2024 Copyright www.ttundra.com
    0.0106