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

Toyota CH-R Service Manual / Seat Belt / Seat Belt Warning System(w/ Occupant Classification System) / 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

NOTICE:

  • The seat belt warning system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

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  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

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.

Click here

Body Electrical > Occupant Detection > Clear DTCs

(b) Check for DTCs.

Click here

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.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(b) Check for DTCs.

Click here

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

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