Toyota 4Runner: Initialization

Toyota 4Runner Service Manual / Vehicle Interior / Supplemental Restraint Systems / Occupant Classification System / Initialization

INITIALIZATION

1. ZERO POINT CALIBRATION

NOTICE:

Make sure that the front passenger seat is not occupied before performing the operation.

HINT:

Perform the zero point calibration and sensitivity check if any of the following conditions apply.

The occupant classification ECU is replaced.
Accessories (seatback tray, seat cover, etc.) are installed.
The front passenger seat is removed from the vehicle.
The passenger airbag ON/OFF indicator ("OFF") comes on when the front passenger seat is not occupied.
An occupant classification sensor collision detection DTC is output due to an accident or a collision.

(a) Zero point calibration and sensitivity check procedures

HINT:

Make sure that zero point calibration has finished normally before performing the sensitivity check.

(1) Adjust the seat position according to the table below.

Adjustment Component	Position
Slide Direction	Rearmost position
Reclining Angle	Upright position
Headrest Height	Lowest position
Lifter Height	Lowest position

(2) Connect the Techstream to the DLC3.

(3) Turn the ignition switch to ON.

(4) Perform the zero point calibration by following the prompts on the screen.

HINT:

Refer to the Techstream operator's manual for further details.

OK:

"Zero Point Calibration is complete." is displayed.

(5) Perform the sensitivity check by following the prompts on the screen.

(6) Confirm that the beginning sensor reading is within the standard range.

Standard:

-3.2 to 3.2 kg (-7.0 to 7.0 lb)

(7) Place a 30 kg (66.1 lb) weight (eg. a 30 kg (66.1 lb) of lead mass) onto the front passenger seat.

NOTICE:

Do not allow the weight to come into contact with the seatback when placing it on the seat cushion.
Place the weight in the area shown in the illustration.

Text in Illustration

*1	Weight Position

(8) Confirm that the sensitivity is within the standard range.

Standard:

27 to 33 kg (59.5 to 72.8 lb)

HINT:

When performing the sensitivity check, use a solid metal weight (the check result may not appear properly if a liquid weight is used).
If the sensitivity deviates from the standard range, retighten the bolts of the front passenger seat taking care not to deform the seat rail. After performing this procedure, if the sensitivity is not within the standard range, replace the front seat cushion spring assembly RH.
If zero point calibration does not finish normally, replace the front seat cushion spring assembly RH.

How To Proceed With Troubleshooting

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System Description

SYSTEM DESCRIPTION 1. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM (a) GENERAL DESCRIPTION (1) In the occupant classification system, the occupant classification ECU calculates the weight of the ...

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