DESCRIPTION
The main body ECU (multiplex network body ECU) detects whether either rear door is open or closed based on the courtesy light switch condition and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects the rear seat belt state. The rear seat belt warning lights on the telltale light assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
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.
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
READ VALUE USING GTS (REAR DOOR COURTESY LIGHT SWITCH)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Main Body / Data List.
Read the Data List according to the display on the GTS.
Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
RR Door Courtesy SW | Rear door courtesy light switch assembly (for RH) | ON or OFF | ON: Rear door RH open OFF: Rear door RH closed |
- |
RL Door Courtesy SW | Rear door courtesy light switch assembly (for LH) | ON or OFF | ON: Rear door LH open OFF: Rear door LH closed |
- |
Tester Display |
---|
RR Door Courtesy SW |
RL Door Courtesy SW |
OK |
---|
ON or OFF appears on the GTS screen according to the rear door condition. |
Result | |||
---|---|---|---|
|
NG |
GO TO LIGHTING SYSTEM Click here |
OK |
CHECK REAR SEAT BELT WARNING
*1 | Rear Seat Belt Warning Light (Telltale Light Assembly) |
*a | LH |
*b | Center |
*c | RH |
Check the rear seat belt warning function.
Result | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
A |
USE SIMULATION METHOD TO CHECK Click here |
C |
READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR RH)) Click here |
D |
READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR CENTER)) Click here |
E |
READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR LH)) Click here |
B |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.
Perform the Active Test according to the display on the GTS.
Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Rear Seat Belt | Rear seat belt warning light | OFF/ON | - |
Tester Display |
---|
Rear Seat Belt |
Result | ||||||
---|---|---|---|---|---|---|
|
B |
REPLACE COMBINATION METER ASSEMBLY Click here |
A |
CHECK HARNESS AND CONNECTOR (BATTERY - TELLTALE LIGHT ASSEMBLY)
Disconnect the E48 telltale light assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)
Reconnect the E48 telltale light assembly connector.
Disconnect the E46 combination meter assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE COMBINATION METER ASSEMBLY Click here |
NG |
REPLACE TELLTALE LIGHT ASSEMBLY Click here |
READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR RH))
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Data List.
Read the Data List according to the display on the GTS.
Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
2nd-Row Seatbelt Buckle (R) | Rear RH seat belt buckle switch signal | ON or OFF | OFF: Rear RH seat belt fastened ON: Rear RH seat belt not fastened |
- |
Tester Display |
---|
2nd-Row Seatbelt Buckle (R) |
Result | ||||||
---|---|---|---|---|---|---|
|
B |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT) Click here |
A |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH - BODY GROUND)
Disconnect the E46 combination meter assembly connector.
Disconnect the L38 rear seat inner with center belt assembly RH connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.
Perform the Active Test according to the display on the GTS.
Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Rear Seat Belt | Rear seat belt warning light | OFF/ON | - |
Tester Display |
---|
Rear Seat Belt |
Result | ||||||
---|---|---|---|---|---|---|
|
B |
REPLACE COMBINATION METER ASSEMBLY Click here |
A |
CHECK HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)
Disconnect the E46 combination meter assembly connector.
Disconnect the E48 telltale light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE TELLTALE LIGHT ASSEMBLY Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR CENTER))
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Data List.
Read the Data List according to the display on the GTS.
Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
2nd-Row Seatbelt Buckle (C) | Rear center seat belt buckle switch signal | ON or OFF | OFF: Rear center seat belt fastened ON: Rear center seat belt not fastened |
- |
Tester Display |
---|
2nd-Row Seatbelt Buckle (C) |
Result | ||||||
---|---|---|---|---|---|---|
|
B |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT) Click here |
A |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH (FOR CENTER) - BODY GROUND)
Disconnect the E46 combination meter assembly connector.
Disconnect the L39 rear seat inner with center belt assembly LH connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.
Perform the Active Test according to the display on the GTS.
Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Rear Seat Belt | Rear seat belt warning light | OFF/ON | - |
Tester Display |
---|
Rear Seat Belt |
Result | ||||||
---|---|---|---|---|---|---|
|
B |
REPLACE COMBINATION METER ASSEMBLY Click here |
A |
CHECK HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)
Disconnect the E46 combination meter assembly connector.
Disconnect the E48 telltale light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE TELLTALE LIGHT ASSEMBLY Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR LH))
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Data List.
Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
2nd-Row Seatbelt Buckle (L) | Rear LH seat belt buckle switch signal | ON or OFF | OFF: Rear LH seat belt fastened ON: Rear LH seat belt not fastened |
- |
Tester Display |
---|
2nd-Row Seatbelt Buckle (L) |
Read the Data List according to the display on the GTS.
Result | ||||||
---|---|---|---|---|---|---|
|
B |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT) Click here |
A |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH (FOR LH) - BODY GROUND)
Disconnect the E46 combination meter assembly connector.
Disconnect the L39 rear seat inner with center belt assembly LH connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING LIGHT)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.
Perform the Active Test according to the display on the GTS.
Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Rear Seat Belt | Rear seat belt warning light | OFF/ON | - |
Tester Display |
---|
Rear Seat Belt |
Result | ||||||
---|---|---|---|---|---|---|
|
B |
REPLACE COMBINATION METER ASSEMBLY Click here |
A |
CHECK HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)
Disconnect the E46 combination meter assembly connector.
Disconnect the E48 telltale light assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE TELLTALE LIGHT ASSEMBLY Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |