SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: INITIALIZATION (2008 LX570)

INITIALIZATION

NOTICE:

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

HINT:

Perform zero point calibration if any of the following conditions is met:

The No. 1 seat cushion (occupant classification ECU) is replaced.
The passenger airbag ON/OFF indicator indicates ("OFF") when the front passenger seat is not occupied.
The vehicle is brought to the workshop for repair due to an accident or a collision.

1. ZERO POINT CALIBRATION

(a) Zero point calibration procedures

(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.
The front passenger seat belt buckle switch is off.

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

Adjustment Item	Position
Slide Direction	Rear most position
Reclining Angle	Upright position
Front vertical Height	Upper most position
Lifter Height	Lower most position

(3) Connect the Techstream to the DLC3.

(4) Turn the engine switch on (IG).

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

HINT:

Refer to the Techstream operator's manual for further details.
If the zero point calibration is performed when the calibration conditions are not satisfied, DTC B1797 is output.
If the zero point calibration has failed, DTC B1797 is output.
If After Exchange is selected before the previous ECU data are stored in the Techstream, the display screen returns to System Select: Body Electrical / Occupant Detection.
OK:

"Zero Point Calibration is complete" is displayed.

Item	Procedure
DTC	Check for DTCs and perform troubleshooting
Write error	Replace No. 1 seat cushion (occupant classification ECU and occupant detection sensor)
Temperature	Check value of Thermistor temperature output in Data List
Pressure	Check value of Filtered pressure sensor output in Data List
Crash counter	-

2. SENSITIVITY CHECK

(a) Sensitivity check procedures

(1) Turn the engine switch off.

(2) Place a weight of 20 kg (44.0 lb) on 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.

(3) Turn the engine switch on (IG), and wait for at least 6 seconds.

(4) Check that the passenger airbag ON/OFF indicator indicates ("OFF").

OK:

Passenger airbag ON/OFF indicator indicates ("OFF").

(5) Add a weight of 30 kg (66.1 lb) to the front passenger seat (total 50 kg (110.2 lb)).

NOTICE:

Do not allow the weight to come into contact with the seatback when placing it on the seat cushion.

(6) Check that the passenger airbag ON/OFF indicator indicates ("ON").

OK:

Passenger airbag ON/OFF indicator indicates ("ON").