Toyota CH-R Service Manual: Front Passenger Side Seat Belt Warning Light Malfunction

DESCRIPTION

When the ignition switch is turned ON, the occupant detection ECU sends signals to the airbag sensor assembly to indicate the state of the front seat inner belt assembly RH and also whether the front passenger seat is occupied. The airbag sensor assembly sends those signals to the combination meter assembly via CAN communication. The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with these signals.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat. Check that the operation of the seat belt warning light is normal first.

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If the seat belt warning light does not operate for both the driver seat and front passenger seat, replace the combination meter assembly.

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PROCEDURE

1.	CHECK DTC OUTPUT (OCCUPANT CLASSIFICATION SYSTEM)

(a) Clear the DTCs.

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Body Electrical > Occupant Detection > Clear DTCs

(b) Check for DTCs.

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Body Electrical > Occupant Detection > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

B

GO TO OCCUPANT CLASSIFICATION SYSTEM

A

2.	CHECK DTC OUTPUT (AIRBAG SYSTEM)

(a) Clear the DTCs.

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Body Electrical > SRS Airbag > Clear DTCs

(b) Check for DTCs.

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Body Electrical > SRS Airbag > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

B

GO TO AIRBAG SYSTEM

A

3.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Occupant Detection / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Occupant Detection > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Passenger Buckle SW	Front passenger buckle switch	Unset, Set or NG	Unset: Seat belt not fastened Set: Seat belt fastened NG: Data is not determined	-

Body Electrical > Occupant Detection > Data List

Tester Display
Passenger Buckle SW

Result	Proceed to
Unset or Set is displayed on the Techstream according to the front passenger seat belt condition	A
Unset or Set is not displayed correctly on the Techstream according to the front passenger seat belt condition	B
NG is displayed on the Techstream	C

B

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

C

REPLACE OCCUPANT DETECTION ECU

A

4.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / SRS Airbag / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > SRS Airbag > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Right side Buckle SW	RH buckle switch	Unset, Set or NG	Unset: Seat belt not fastened Set: Seat belt fastened NG: Data is not determined	-

Body Electrical > SRS Airbag > Data List

Tester Display
Right side Buckle SW

Result	Proceed to
Unset or Set is displayed on the Techstream according to the front passenger seat belt condition	A
Unset or Set is not displayed correctly on the Techstream according to the front passenger seat belt condition NG is displayed on the Techstream	B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE AIR BAG SENSOR ASSEMBLY