Toyota CH-R Service Manual: Initialization

Toyota CH-R Service Manual / Supplemental Restraint Systems / Occupant Classification System / Initialization

INITIALIZATION

DESCRIPTION

(a) Zero point of the occupant classification sensors may deviate in the following situations. To ensure sensor accuracy, be sure to perform Zero Point Calibration.

The occupant detection ECU is replaced.
HINT:

As the zero point is not automatically stored in a new occupant detection ECU, it is necessary to perform zero point calibration after replacing the occupant detection ECU.
Accessories (seatback tray, seat cover, etc.) are installed.
HINT:

As the weight of accessories will be added to the weight of the occupant, the system will not be able to perform classification accurately.
The front passenger seat is removed from the vehicle.
HINT:

As the seat frame will warp slightly when the bolts that are used to install the front passenger seat are tightened, the load applied to the occupant classification sensor will change and the system will not be able to perform classification accurately.
Any of the bolts that are used to install the front passenger seat are removed and reinstalled.
HINT:

As the seat frame will warp slightly when the bolts that are used to install the front passenger seat are tightened, the load applied to the occupant classification sensor will change and the system will not be able to perform classification accurately.
The passenger airbag ON/OFF indicator ("ON") illuminates when the front passenger seat is not occupied.
HINT:

If any load or pressure is applied to the occupant classification sensors, the system will not be able to perform classification accurately.
A occupant classification sensor collision detection DTC is output due to an accident or a collision.

NOTICE:

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

ZERO POINT CALIBRATION

(a) Zero point calibration procedure

(1) Check that all of the following conditions are met:

The vehicle is parked on a level surface.
No objects are placed on the front passenger seat.
No objects are touching the front passenger seat.

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

Adjustment Item	Position
Slide Direction	Rearmost position
Headrest Height	Lowest position
Recline Angle	Upright position

(3) Turn the ignition switch off.

(4) Connect the Techstream to the DLC3.

(5) Turn the ignition switch to ON.

(6) Turn the Techstream on.

(7) Enter the following menus: Body Electrical / Occupant Detection / Utility / Zero Point Calibration.

Body Electrical > Occupant Detection > Utility

Tester Display
Zero Point Calibration

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

OK:

"Zero Point Calibration is complete." is displayed.

HINT:

Refer to the Techstream operator's manual for further details.
If zero point calibration does not complete normally, perform this procedure again. If zero point calibration cannot be completed normally, replace the front seat adjuster assembly RH.

System Description

SYSTEM DESCRIPTION GENERAL (a) The occupant detection ECU estimates the weight of an occupant based on signals received from the 2 occupant classification sensors. The occupant detection ECU det ...

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

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