Toyota Tacoma manuals

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

SYSTEM DESCRIPTION

1. SEAT BELT WARNING SYSTEM DESCRIPTION

(a) Seat belt warning light operation for driver seat belt:

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) Seat belt warning light operation for front passenger seat belt:

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 front 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 an interval of 1.2 seconds 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 24 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 COMPONENTS

Component

Function

Front seat inner belt assembly LH

Informs the airbag sensor assembly of the driver seat belt condition (fastened or unfastened).

Front seat inner belt assembly RH

Informs the occupant detection ECU of the front passenger seat belt condition (fastened or unfastened).

  • Front occupant classification sensor LH
  • Front occupant classification sensor RH
  • Rear occupant classification sensor LH
  • Rear occupant classification sensor RH

Informs the occupant detection ECU of the front passenger seat condition (occupied or unoccupied).

Combination meter assembly

  • The combination meter assembly illuminates, blinks or turns off the seat belt warning light.
  • The combination meter assembly sounds the seat belt warning buzzer.

Occupant detection ECU

Sends the front passenger seat belt buckle switch signal and occupant detection signal to the airbag sensor assembly.

Airbag sensor assembly

  • Sends the driver seat belt buckle switch signal to the main body ECU via CAN communication.
  • Sends the front passenger seat belt buckle switch signal to the combination meter assembly via CAN communication.

Main body ECU

Sends the driver seat belt buckle switch signal to the combination meter assembly via CAN communication.

  • Brake actuator assembly (Skid control ECU)*1
  • Brake booster with master cylinder assembly (Skid control ECU)*2

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.

  • *1: for Vacuum brake booster
  • *2: for Hydraulic brake booster
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use these procedure to troubleshoot the seat belt warning system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO W ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. 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 p ...

Other materials:

Central Gateway ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Central Gateway ECU Communication Stop Mode Communication system DTCs (DTCs that start with U) that correspond to "Central Gateway ECU Communication Stop Mode" in "DTC Com ...

IG Signal Circuit
DESCRIPTION This circuit detects whether the ignition switch is ON or off, and sends this information to the main body ECU (multiplex network body ECU). WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the fol ...

Removal
REMOVAL PROCEDURE 1. REMOVE REAR SEAT CUSHION ASSEMBLY (a) Remove the 2 bolts and rear seat cushion assembly. 2. REMOVE REAR SEATBACK HINGE COVER (a) Disengage the 6 claws to remove the 2 rear seatback hinge covers. ...

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