Toyota CH-R Service Manual: Driver Side Seat Belt Warning Light does not Operate

Toyota CH-R Service Manual / Seat Belt / Seat Belt Warning System(w/o Occupant Classification System) / Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

The combination meter assembly blinks or turns off the seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly (driver seat).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.
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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.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
*1: w/ Smart key System

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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.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

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

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
D Seat Buckle SW	Driver seat belt buckle switch	ON or OFF	ON: Driver seat belt unfastened OFF: Driver seat belt fastened	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

D Seat Buckle SW

Driver seat belt buckle switch

ON or OFF

ON: Driver seat belt unfastened

OFF: Driver seat belt fastened

Body Electrical > Main Body > Data List

Tester Display
D Seat Buckle SW

OK:

ON or OFF appears on the Techstream screen according to the driver seat belt condition.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

2.	INSPECT FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT)

(a) Remove the front seat inner belt assembly (driver seat).

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(b) Inspect the front seat inner belt assembly (driver seat) (seat belt warning switch).

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REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT)

3.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU).

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Component without harness connected

(Instrument Panel Junction Block Assembly)

(b) Disconnect the 3H instrument panel junction block assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
MB-18 (DBKL) - 3H-33	Always	Below 1 Ω

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT) - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3H-33 - M73-3 (+)	Always	Below 1 Ω
M73-3 (+) - Body ground	Always	10 kΩ or higher
M73-2 (E) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Terminals Of Ecu

TERMINALS OF ECU CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY *A Main Body ECU (Multiplex Network Body ECU) with 1 Connecto ...

On-vehicle Inspection

ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT DRIVER SEAT BELT WARNING SYSTEM HINT: The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenge ...

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