Toyota 4Runner: System Description

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / System Description

SYSTEM DESCRIPTION

1. THEFT DETERRENT SYSTEM DESCRIPTION

(a) The theft deterrent system is designed to deter vehicle break-ins and theft. If an attempted break-in or theft is detected, the vehicle horn(s) and security horn sound, the interior light illuminates, and the headlights, taillights and hazard warning lights flash. The system detects an attempted break-in or theft when any of the following occurs: 1) the vehicle is forcibly entered; 2) the engine hood is forcibly opened; 3) the doors are unlocked without the use of a key; or 4) the cable is disconnected from the negative (-) battery terminal and then reconnected.

If the system enters the alarm sounding state, any unlocked doors automatically lock.

(b) The system has an active arming mode (refer to Active Arming Mode).

(1) Disarmed state:

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

(2) Arming preparation state:

The theft deterrent system is not operating.

(3) Armed state:

The theft deterrent system is operating.

(4) Alarm sounding state:

The alarm function is operating (60 +/-5 seconds).

Alarm Method and Time

Alarm Method	Hazard Warning Light	Blinking (cycle of flasher relay)
	Vehicle Horn(s)	Sounding (cycle of 0.4 seconds)
	Security Horn	Sounding (cycle of 0.4 seconds)
	Headlight	Flashing
	Taillight	Flashing
	Interior Light	Illuminating
	Security Indicator Light	Illuminating
Alarm Time	60 +/-5 seconds

HINT:

If, during the alarm sounding state, one of the doors is unlocked without using a proper key, a forced door lock signal is output (refer to Forced Door Lock Control).

2. FUNCTION OF MAIN COMPONENT

Function	Outline
Security indicator light	Informs the driver of the theft deterrent system status.
Headlight	Begins flashing when an attempted break-in or theft is detected.
Taillight	Begins flashing when an attempted break-in or theft is detected.
Hazard warning light	Begins flashing when an attempted break-in or theft is detected.
Low pitched horn	Sounds when an attempted break-in or theft is detected.
High pitched horn	Sounds when an attempted break-in or theft is detected.
Security horn	Sounds when an attempted break-in or theft is detected.
Door courtesy light switch	Detects the door open status (open or closed).
Door lock position switch	Detects the door lock status (locked or unlocked).
Security courtesy switch	Detects the engine hood open status (open or closed).
Main body ECU	Detects the ignition switch condition (off, ACC or ON).

3. ACTIVE ARMING MODE

HINT:

Active arming mode starts alarm control immediately after doors are locked.

System State	State Switching Condition	Transfer to
1. Disarmed state	Perform one of following and system changes to "Arming preparation state": With all doors and engine hood closed, lock all doors by entry lock operation* or wireless operation With all doors and engine hood closed, lock all doors using mechanical key With engine hood open, lock all doors and close engine hood	2. Arming preparation state
2. Arming preparation state	Perform one of following and system changes to "Disarmed state": Unlock all doors by entry unlock operation* or wireless operation Unlock all doors using mechanical key Unlock door Open engine hood Turn ignition switch to ON or ACC Reconnect battery	1. Disarmed state
2. Arming preparation state	Perform one of following and system changes to "Armed state": Allow 30 (+/-1.5) seconds to elapse	3. Armed state
3. Armed State	Perform one of following and system changes to "Disarmed state": Unlock all doors by entry unlock operation* or wireless operation Unlock all doors using mechanical key Turn ignition switch to ON or ACC	1. Disarmed state
3. Armed State	Perform one of following and system changes to "Alarm sounding state": Open engine hood Open door Unlock all doors without entry unlock operation* or wireless operation Unlock door without using mechanical key Disconnect and reconnect cable to negative (-) battery terminal Force engine ignition system to turn on without proper engine start method	4. Alarm sounding state
4. Alarm sounding state	Perform one of following and system changes to "Disarmed state": Unlock all doors by entry unlock operation* or wireless operation Unlock all doors using mechanical key Turn ignition switch to ON or ACC	1. Disarmed state
4. Alarm sounding state	Perform one of following and system changes to "Armed state": Allow 60 (+/-5) seconds to elapse	3. Armed state (alarm stops sounding)

*: w/ Smart Key System

4. FORCED DOOR LOCK CONTROL

(a) Forced door lock control also helps to prevent the vehicle from being tampered with. When a door is unlocked and the alarm starts, the door is forced to lock by a forced door lock signal.

(1) Conditions that force the doors to lock:

0.4 seconds have elapsed after the previous output of a forced door lock signal.
The theft deterrent system is in the alarm sounding state.
A door is unlocked.

5. PANIC ALARM CONTROL

(a) Panic alarm control activates the panic alarm when the wireless transmitter panic switch is pressed. Panic alarm control operates independently from the change of theft deterrent system alarm control from the armed state to the alarm sounding state.

(1) The panic alarm is activated when the panic switch on the wireless transmitter is pressed and held for 1.0 seconds or more under the following conditions.

The ignition switch is off.
The theft deterrent system is not in the alarm sounding state.
Panic alarm control is not operating (the alarm is not sounding).

(2) The panic alarm is deactivated when any of the following conditions is fulfilled during panic alarm operation.

The ignition switch is turned to ON.
The wireless transmitter lock/unlock switch is pressed.
60 +/-5 seconds have passed and the panic alarm has ended.
The theft deterrent system changes to the alarm sounding state. However, the alarm still sounds, because the theft deterrent system has changed to the alarm sounding state.
Conditions for canceling the panic alarm are the same as for alarm control.

6. ALARM MEMORY FUNCTION

(a) Alarm memory is the function that informs the user that the alarm sounded (an attempted break-in or theft was detected) after the theft deterrent system was set by illuminating the taillights for 2 seconds when the theft deterrent system is canceled.

(1) The alarm memory function illuminates the taillights for 2 seconds if the following conditions are met:

The theft deterrent system enters the alarm sounding state even once after the theft deterrent system is set.
During active arming mode, the system changes from the armed state to the disarmed state.

7. SECURITY INDICATOR LIGHT OUTPUT

(a) The security indicator light turns on and off based on output signals from the main body ECU. However, in some cases, the actual status of the security indicator light is different from the output signals from the main body ECU.

Output

State of Theft Deterrent System	Security Indicator
State of Theft Deterrent System	Output Signals from ECU	Actual Lighting Condition
Disarmed state	Off	Off (Immobiliser system unset) Blinking (Immobiliser system set)
Arming preparation state	On	On
Armed state	Off	Blinking
Alarm sounding state	On	On

Blinking Cycle

Time	Security Indicator
0.2 seconds	On
1.8 seconds	Off

HINT:

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

Precaution

PRECAUTION 1. IGNITION SWITCH EXPRESSION HINT: 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 ...

System Diagram

SYSTEM DIAGRAM ...

Other materials about Toyota 4Runner:

Precaution
PRECAUTION 1. PRECAUTIONS WHEN WORKING ON ELECTRIC STEERING LOCK (a) After replacing the steering lock actuator assembly (steering lock ECU), perform key ID code registration. (b) After replacing the steering lock actuator assembly (steering lock ECU), ...

Crawl Indicator Light Remains ON
DESCRIPTION Refer to Crawl Indicator Light does not Come ON (See page ). WIRING DIAGRAM Refer to Crawl Indicator Light does not Come ON (See page ). CAUTION / NOTICE / HINT NOTICE: When replacing the master cylinder solenoid, perform calibration (See ...