Toyota CH-R Service Manual: Rear Seat Belt Warning Light Malfunction

DESCRIPTION

The main body ECU (multiplex network body ECU) detects whether either the rear doors are open or closed based on the condition of the rear door courtesy light switch assemblies condition and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects rear seat belt state. The rear seat belt warning light on the clock assembly illuminates or turns off in accordance with the rear door state, vehicle speed and rear seat belt state.

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.

    Click here

  • 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.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (REAR DOOR COURTESY LIGHT SWITCH)

(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 / 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

RR Door Courtesy SW

Rear door courtesy light switch RH

ON or OFF

ON: Rear door RH open

OFF: Rear door RH closed

-

RL Door Courtesy SW

Rear door courtesy light switch LH

ON or OFF

ON: Rear door LH open

OFF: Rear door LH closed

-

Body Electrical > Main Body > Data List

Tester Display

RR Door Courtesy SW

RL Door Courtesy SW

OK:

ON or OFF appears on the Techstream screen according to the rear door condition.

NG

GO TO LIGHTING SYSTEM

OK

2.

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 / Combination Meter / Data List.

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

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

2nd-Row Seatbelt Buckle (R)

Rear RH seat belt buckle switch signal

ON or OFF

ON: Rear RH seat belt not fastened

OFF: Rear RH seat belt fastened

-

2nd-Row Seatbelt Buckle (L)

Rear LH seat belt buckle switch signal

ON or OFF

ON: Rear LH seat belt not fastened

OFF: Rear LH seat belt fastened

-

2nd-Row Seatbelt Buckle (C)

Rear center seat belt buckle switch signal

ON or OFF

ON: Rear center seat belt not fastened

OFF: Rear center seat belt fastened

-

Body Electrical > Combination Meter > Data List

Tester Display

2nd-Row Seatbelt Buckle (R)

2nd-Row Seatbelt Buckle (L)

2nd-Row Seatbelt Buckle (C)

OK:

The Techstream display changes correctly in response to the rear door condition.

Result

Proceed to

ON or OFF is displayed on the Techstream screen according to the rear seat belt condition

A

ON or OFF is not displayed normally on the Techstream screen according to the rear LH seat belt condition

B

ON or OFF is not displayed normally on the Techstream screen according to the rear center seat belt condition

B

ON or OFF is not displayed normally on the Techstream screen according to the rear RH seat belt condition

C

B

GO TO STEP 6

C

GO TO STEP 8

A

3.

CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - BATTERY)

(a) Disconnect the clock assembly connector.

*a

Front view of wire harness connector

(to Clock Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F81-1 (IG+) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT CLOCK ASSEMBLY

(a) Remove the clock assembly.

Click here

(b) Inspect the clock assembly.

Click here

NG

REPLACE CLOCK ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the F81 clock assembly connector.

(b) Disconnect the F4 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F81-12 (RLID) - F4-1 (RLMT)

Always

Below 1 Ω

F81-13 (RCID) - F4-2 (RCMT)

Always

Below 1 Ω

F81-14 (RRID) - F4-3 (RRMT)

Always

Below 1 Ω

F81-12 (RLID) or F4-1 (RLMT) - Body ground

Always

10 kΩ or higher

F81-13 (RCID) or F4-2 (RCMT) - Body ground

Always

10 kΩ or higher

F81-14 (RRID) or F4-3 (RRMT) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

(a) Remove the rear seat inner with center belt assembly LH.

Click here

(b) Inspect the rear seat inner with center belt assembly LH.

Click here

NG

REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

OK

7.

CHECK HARNESS AND CONNECTOR (REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND)

(a) Disconnect the M32 and M33 rear seat inner with center belt assembly LH connectors.

(b) Disconnect the F4 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M32-4 (LBR+) - F4-10 (MSD)

Always

Below 1 Ω

M33-1 (CBR+) - F4-11 (MSTI)

Always

Below 1 Ω

M32-5 (LBR-) - Body ground

Always

Below 1 Ω

M33-2 (CBR-) - Body ground

Always

Below 1 Ω

M32-4 (LBR+) or F4-10 (MSD) - Body ground

Always

10 kΩ or higher

M33-1 (CBR+) or F4-11 (MSTI) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

INSPECT REAR SEAT INNER BELT ASSEMBLY RH

(a) Remove the rear seat inner belt assembly RH.

Click here

(b) Inspect the rear seat inner belt assembly RH.

Click here

NG

REPLACE REAR SEAT INNER BELT ASSEMBLY RH

OK

9.

CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)

(a) Disconnect the M31 rear seat inner belt assembly RH connector.

(b) Disconnect the F4 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M31-5 (RBR+) - F4-13 (MSFM)

Always

Below 1 Ω

M31-4 (RBR-) - Body ground

Always

Below 1 Ω

M31-5 (RBR+) or F4-13 (MSFM) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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