Toyota 4Runner: System Description
SYSTEM DESCRIPTION
1. SEAT BELT WARNING SYSTEM DESCRIPTION
If a seat belt is not fastened, this system flashes the seat belt warning light or sounds the seat belt warning buzzer as a reminder.
(a) Driver side seat belt warning light:
The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with the driver seat belt state, vehicle speed, shift lever position and parking brake state.
(b) Front passenger side seat belt warning light:
The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with whether the front passenger seat is occupied, the passenger seat belt state, vehicle speed, shift lever position and parking brake state.
(c) Seat belt warning buzzer:
After turning the ignition switch to ON, if the driver seat belt is not fastened within 1.8 seconds, check that the seat belt warning buzzer in the combination meter assembly sounds at 1.2 second intervals for 6 seconds.
When the vehicle is driven at 20 km/h (12 mph) or more with the front passenger seat occupied and the driver or front passenger seat belt not fastened, the seat belt warning buzzer in the combination meter assembly sounds once.
When 30 seconds have passed after the buzzer sounded, the seat belt warning buzzer in the combination meter assembly sounds at an interval of 1.2 seconds for 9.6 seconds.
After that, the seat belt warning buzzer in the combination meter assembly sounds at an interval of 0.4 seconds for 20 seconds.
2. FUNCTION OF MAIN COMPONENT
The following functions are available.
|
Components |
Function |
|---|---|
|
Front seat inner belt assembly LH (driver side buckle switch) |
Informs the center airbag sensor assembly of the driver side seat belt condition (fastened or unfastened). |
|
Front seat inner belt assembly RH (front passenger side buckle switch) |
Informs the occupant classification ECU of the front passenger side seat belt condition (fastened or unfastened). |
|
Informs the occupant classification ECU of the front passenger seat condition (occupied or unoccupied). |
|
Occupant detection ECU |
Sends the front passenger seat belt buckle switch signal and occupant detection signal to the center airbag sensor assembly. |
|
Center airbag sensor assembly |
|
|
Parking brake switch assembly |
Informs the main body ECU (multiplex network body ECU) of the parking brake condition. |
|
Main body ECU (multiplex network body ECU) |
Sends the driver seat belt buckle switch signal and parking brake switch signal to the combination meter assembly via CAN communication. |
|
Skid control ECU (master cylinder solenoid) |
Sends the vehicle speed signal to the combination meter assembly via CAN communication. |
|
ECM |
Sends the shift position signal to the combination meter assembly via CAN communication. |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedures to troubleshoot the seat belt warning system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BRO ...
Customize Parameters
CUSTOMIZE PARAMETERS
1. CUSTOMIZING FUNCTION WITH TECHSTREAM (REFERENCE)
NOTICE:
When the customer requests a change in a function, first make sure that
the function can be customized. ...
Other materials about Toyota 4Runner:
Data List / Active Test
DATA LIST / ACTIVE TEST
1. READ DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very usefu ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Disconnect the F42 air conditioning amplifier connector.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
Terminal No. (Symbol)
...
0.1139