RM38T0EC _58 Vehicle Interior _114202 SEAT BELT _0506146 SEAT BELT WARNING SYSTEM J

SEAT BELT  SEAT BELT WARNING SYSTEM  Rear Seat Belt Warning Light Malfunction  


DESCRIPTION

The power distribution box assembly sends a signal indicating a rear seat belt status when the ignition switch is ON to the main body ECU (multiplex network body ECU) via CXPI communication.

The main body ECU (multiplex network body ECU) sends a signal indicating the rear door courtesy light switch status when the ignition switch is ON or off and a signal indicating a rear seat belt status when the ignition switch is ON to the combination meter assembly via CAN communication.

Depending on the rear door courtesy light switch signal, rear seat belt status, shift position and vehicle speed, the combination meter assembly illuminates or turns off the rear seat belt warning light.

WIRING DIAGRAM

B581808E01
0.354,1.479 1.594,2.063 1.24,0.583 10 false Combination Meter Assembly 3.104,2 4.792,2.542 1.688,0.542 10 false Main Body ECU (Multiplex Network Body ECU) 1.771,3.74 4.75,4.052 2.979,0.313 10 false Rear Door Courtesy Light Switch Assembly (RH) 1.781,4.823 4.823,5.167 3.042,0.344 10 false Rear Door Courtesy Light Switch Assembly (LH) 1.76,3.573 2.427,3.948 0.667,0.375 10 false O34 1.781,4.656 2.448,5.031 0.667,0.375 10 false O31 1.969,6.583 2.635,6.958 0.667,0.375 10 false O86 1.969,7.135 2.635,7.51 0.667,0.375 10 false O85 3.615,6.573 4.281,6.948 0.667,0.375 10 false O86 3.615,7.125 4.281,7.5 0.667,0.375 10 false O85 5.313,1.073 5.979,1.448 0.667,0.375 10 false MB 5.323,1.552 5.99,1.927 0.667,0.375 10 false MB 6.552,3.781 7.021,4.094 0.469,0.313 10 false IC 4.833,1.083 5.5,1.458 0.667,0.375 10 false LCTY 4.813,1.563 5.479,1.938 0.667,0.375 10 false RCTY 4.969,3.271 5.635,3.646 0.667,0.375 10 false 8F 5,3.063 5.667,3.438 0.667,0.375 10 false 1 4.969,4.146 5.635,4.521 0.667,0.375 10 false 28 5.375,1.354 6.042,1.729 0.667,0.375 10 false 1 5.365,0.885 6.031,1.26 0.667,0.375 10 false 6 2.042,5.885 4.677,6.198 2.635,0.313 10 false Rear Seat Inner Belt Assembly RH 2.042,5.729 2.917,6.083 0.875,0.354 10 false O84 1.635,7.521 4.604,7.99 2.969,0.469 10 false Rear Seat Inner with Center Belt Assembly LH 5.573,7.573 6.76,8.135 1.188,0.563 10 false Power Distribution Box Assembly 5.01,5.229 5.677,5.604 0.667,0.375 10 false 8 5,6.375 5.667,6.75 0.667,0.375 10 false 4 4.969,6.927 5.635,7.302 0.667,0.375 10 false 19 0.594,8.375 2.385,8.729 1.792,0.354 10 false : CAN Communication Line 3.625,5.313 4.292,5.688 0.667,0.375 10 false 5 2.125,5.313 2.792,5.688 0.667,0.375 10 false 4 3.708,6.927 4.375,7.302 0.667,0.375 10 false 5 2.052,6.948 2.719,7.323 0.667,0.375 10 false 4 2.052,6.396 2.719,6.771 0.667,0.375 10 false 2 3.688,6.365 4.354,6.74 0.667,0.375 10 false 1 3.625,3.167 4.292,3.542 0.667,0.375 10 false 1 3.615,4.25 4.281,4.625 0.667,0.375 10 false 1 4.969,4.344 5.635,4.719 0.667,0.375 10 false 8F 4.979,5.427 5.646,5.802 0.667,0.375 10 false 8F 4.969,6.573 5.635,6.948 0.667,0.375 10 false 8F 4.979,7.135 5.646,7.51 0.667,0.375 10 false 8F 3.083,8.385 5.219,8.729 2.135,0.344 10 false : CXPI Communication Line 3.146,7.021 3.76,7.219 0.615,0.198 10 false LBR+ 2.313,7.021 2.927,7.219 0.615,0.198 10 false LBR- 3.135,6.469 3.75,6.667 0.615,0.198 10 false CBR+ 2.313,6.479 2.927,6.677 0.615,0.198 10 false CBR- 3.146,5.313 3.76,5.51 0.615,0.198 10 false RBR+ 2.323,5.323 2.938,5.521 0.615,0.198 10 false RBR-

CAUTION / NOTICE / HINT

NOTICE:
·

The seat belt warning system uses the CAN communication system and CXPI communication system. First, confirm that there is no malfunction in the CAN communication system and CXPI communication system. Refer to the How to Proceed with Troubleshooting procedure.

Click hereVehicle Interior>SEAT BELT>SEAT BELT WARNING SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

·

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 Service Bulletin.*

*: w/ Smart Entry and Start System




PROCEDURE

1.READ VALUE USING GTS
a.

Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
RR Door Courtesy Switch Status Rear door courtesy light switch (RH) signal Close or Open Close: Rear door RH closed
Open: Rear door RH open 		-
RL Door Courtesy Switch Status Rear door courtesy light switch (LH) signal Close or Open Close: Rear door LH closed
Open: Rear door LH open 		-
Body Electrical > Main Body > Data List
Tester Display
RR Door Courtesy Switch Status
RL Door Courtesy Switch Status
50003 449 32,33
OK:

The GTS display changes correctly in response to the rear door courtesy light switch condition.



Result:
Proceed to
OK
NG



OK

2.READ VALUE USING GTS

NG

GO TO LIGHTING SYSTEM (Proceed to Rear Door Courtesy Switch Circuit)

Click hereVehicle Interior>LIGHTING (INT)>LIGHTING SYSTEM>Rear Door Courtesy Switch Circuit


2.READ VALUE USING GTS
a.

Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Rear Seat RH Buckle Switch Status Rear RH seat belt buckle switch Set, Unset or Unknown Set: Rear RH seat belt buckle switch fastened
Unset: Rear RH seat belt buckle switch unfastened
Unknown: Data is not determined 		-
Rear Seat Center Buckle Switch Status Rear center seat belt buckle switch Set, Unset or Unknown Set: Rear center seat belt buckle switch fastened
Unset: Rear center seat belt buckle switch unfastened
Unknown: Data is not determined 		-
Rear Seat LH Buckle Switch Status Rear LH seat belt buckle switch Set, Unset or Unknown Set: Rear LH seat belt buckle switch fastened
Unset: Rear LH seat belt buckle switch unfastened
Unknown: Data is not determined 		-
Body Electrical > Power Distribution Box > Data List
Tester Display
Rear Seat RH Buckle Switch Status
Rear Seat Center Buckle Switch Status
Rear Seat LH Buckle Switch Status
50003 475 1402,1403,1404
OK:

The GTS display changes correctly in response to the rear seat belt buckle switch condition.



Result:
Result Proceed to
OK A
NG (Unknown displayed) B
NG (Rear RH seat belt malfunction) C
NG (Rear center seat belt malfunction) D
NG (Rear LH seat belt malfunction) E



A

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL


B

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


C

3.INSPECT REAR SEAT INNER BELT ASSEMBLY RH

D

5.INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

E

7.INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH
3.INSPECT REAR SEAT INNER BELT ASSEMBLY RH

Click hereVehicle Interior>SEAT BELT>REAR SEAT INNER BELT ASSEMBLY (for RH Side)>INSPECTION

Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

NG

REPLACE REAR SEAT INNER BELT ASSEMBLY RH

Click hereVehicle Interior>SEAT BELT>REAR SEAT INNER BELT ASSEMBLY (for RH Side)>REMOVAL


4.CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)
a.

Disconnect the 8F power distribution box assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
O84-5 (RBR+) - 8F-8 Always Below 1 Ω
O84-5 (RBR+) or 8F-8 - Body ground Always 10 kΩ or higher
O84-4 (RBR-) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

Click hereVehicle Interior>SEAT BELT>REAR SEAT INNER BELT ASSEMBLY (for LH Side)>INSPECTION

Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

NG

REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

Click hereVehicle Interior>SEAT BELT>REAR SEAT INNER BELT ASSEMBLY (for LH Side)>REMOVAL


6.CHECK HARNESS AND CONNECTOR (REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)
a.

Disconnect the 8F power distribution box assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
O86-1 (CBR+) - 8F-4 Always Below 1 Ω
O86-1 (CBR+) or 8F-4 - Body ground Always 10 kΩ or higher
O86-2 (CBR-) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

Click hereVehicle Interior>SEAT BELT>REAR SEAT INNER BELT ASSEMBLY (for LH Side)>INSPECTION

Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

NG

REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH

Click hereVehicle Interior>SEAT BELT>REAR SEAT INNER BELT ASSEMBLY (for LH Side)>REMOVAL


8.CHECK HARNESS AND CONNECTOR (REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)
a.

Disconnect the 8F power distribution box assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
O85-5 (LBR+) - 8F-19 Always Below 1 Ω
O85-5 (LBR+) or 8F-9 - Body ground Always 10 kΩ or higher
O85-4 (LBR-) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR