DESCRIPTION The main body
ECU (multiplex network body ECU) detects whether either the rear doors
are 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 rear seat belt state. The rear
seat belt warning light on the radio and display receiver assembly
illuminates, blinks 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 
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE |
1. | READ VALUE USING TECHSTREAM (REAR DOOR COURTESY LIGHT SWITCH) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(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: The Techstream display changes correctly in response to the rear door condition.
| NG |
 | GO TO LIGHTING SYSTEM |
|
OK |
 | |
| 2. |
CHECK REAR SEAT BELT WARNING |
| (a) Check the rear seat belt warning function. Click here
|
 |
|
*1 | Rear Seat Belt Warning Light (Radio and Display Receiver Assembly) | |
*a | LH | |
*b | Center | |
*c | RH | | |
|
Result | Proceed to | |
The rear seat belt warning lights operation is normal |
A | | The rear seat belt warning lights (all seats) do not operate normally |
B | | The rear seat belt warning light (RH) does not operate normally |
C | | The rear seat belt warning light (center) does not operate normally |
D | | The rear seat belt warning light (LH) does not operate normally |
E |
| A |
| USE SIMULATION METHOD TO CHECK |
| C |
| GO TO STEP 6 |
| D |
| GO TO STEP 10 |
| E |
| GO TO STEP 14 |
|
B | |
| |
| 3. |
PERFORM ACTIVE TEST USING TECHSTREAM (REAR SEAT BELT WARNING LIGHT) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Perform the Active Test according to the display on the Techstream. Body Electrical > Combination Meter > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Rear Seat Belt Warning |
Rear seat belt warning light |
OFF/ON | - | Body Electrical > Combination Meter > Active Test
|
Tester Display | | Rear Seat Belt Warning |
|
Result | Proceed to | |
The rear seat belt warning light does not operate normally |
A | | The rear seat belt warning light operates normally |
B |
| B |
| REPLACE COMBINATION METER ASSEMBLY |
|
A | |
| |
| 4. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE - RADIO AND DISPLAY RECEIVER ASSEMBLY) |
(a) Disconnect the G20 radio and display receiver assembly connector. (b) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G20-2 (IG+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 5. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Reconnect the G20 radio and display receiver assembly connector. (b) Disconnect the G16 combination meter assembly connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G16-18 (RLMT) - Body ground |
Engine switch on (IG) |
11 to 14 V | |
G16-19 (RCMT) - Body ground |
Engine switch on (IG) |
11 to 14 V | |
G16-20 (RRMT) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| OK |
| REPLACE COMBINATION METER ASSEMBLY |
| NG |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| 6. |
READ VALUE USING TECHSTREAM (REAR SEAT BELT BUCKLE SWITCH (FOR RH)) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(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 | |
Rear Right Seat Buckle / Occupant Detection Warning Switch |
Rear seat inner with center belt RH buckle signal |
ON or OFF | OFF: Rear RH seat belt fastened
ON: Rear RH seat belt not fastened |
- | Body Electrical > Combination Meter > Data List
|
Tester Display | | Rear Right Seat Buckle / Occupant Detection Warning Switch |
|
Result | Proceed to | |
ON or OFF does not appear on the Techstream according to the rear seat belt condition |
A | | ON or OFF appears on the Techstream according to the rear seat belt condition |
B |
| B |
| GO TO STEP 8 |
|
A | |
| |
| 7. |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH - BODY GROUND) |
(a) Disconnect the G16 combination meter assembly connector. (b) Disconnect the K55 rear seat inner with center belt assembly RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G16-26 (RRSB) - K55-5 (RBR+) |
Always | Below 1 Ω | |
G16-26 (RRSB) or K55-5 (RBR+) - Body ground |
Always | 10 kΩ or higher | |
K55-4 (RBR-) - Body ground |
Always | Below 1 Ω |
| OK |
| REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 8. |
PERFORM ACTIVE TEST USING TECHSTREAM (REAR SEAT BELT WARNING LIGHT) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Perform the Active Test according to the display on the Techstream. Body Electrical > Combination Meter > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Rear Seat Belt Warning |
Rear seat belt warning light |
OFF/ON | - | Body Electrical > Combination Meter > Active Test
|
Tester Display | | Rear Seat Belt Warning |
|
Result | Proceed to | |
The rear seat belt warning light does not operate normally |
A | | The rear seat belt warning light operates normally |
B |
| B |
| REPLACE COMBINATION METER ASSEMBLY |
|
A | |
| |
| 9. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the G16 combination meter assembly connector. (b) Disconnect the G20 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G16-20 (RRMT) - G20-4 (RRID) |
Always | Below 1 Ω | |
G16-20 (RRMT) or G20-4 (RRID) - Body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 10. |
READ VALUE USING TECHSTREAM (REAR SEAT BELT BUCKLE SWITCH (FOR CENTER)) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(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 | |
Rear Center Seat Buckle / Occupant Detection Warning Switch |
Rear seat inner belt LH (for center) buckle signal |
ON or OFF | OFF: Rear LH seat belt (for center) fastened
ON: Rear LH seat belt (for center) not fastened |
- | Body Electrical > Combination Meter > Data List
|
Tester Display | | Rear Center Seat Buckle / Occupant Detection Warning Switch |
|
Result | Proceed to | |
ON or OFF does not appear on the Techstream according to the rear seat belt condition |
A | | ON or OFF appears on the Techstream according to the rear seat belt condition |
B |
| B |
| GO TO STEP 12 |
|
A | |
| |
| 11. |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND) |
(a) Disconnect the G16 combination meter assembly connector. (b) Disconnect the K56 rear seat inner belt assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G16-25 (RCSB) - K56-1 (CBR+) |
Always | Below 1 Ω | |
G16-25 (RCSB) or K56-1 (CBR+) - Body ground |
Always | 10 kΩ or higher | |
K56-2 (CBR-) - Body ground |
Always | Below 1 Ω |
| OK |
| REPLACE REAR SEAT INNER BELT ASSEMBLY LH |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 12. |
PERFORM ACTIVE TEST USING TECHSTREAM (REAR SEAT BELT WARNING LIGHT) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Perform the Active Test according to the display on the Techstream. Body Electrical > Combination Meter > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Rear Seat Belt Warning |
Rear seat belt warning light |
OFF/ON | - | Body Electrical > Combination Meter > Active Test
|
Tester Display | | Rear Seat Belt Warning |
|
Result | Proceed to | |
The rear seat belt warning light does not operate normally |
A | | The rear seat belt warning light operates normally |
B |
| B |
| REPLACE COMBINATION METER ASSEMBLY |
|
A | |
| |
| 13. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the G16 combination meter assembly connector. (b) Disconnect the G20 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G16-19 (RCMT) - G20-12 (RCID) |
Always | Below 1 Ω | |
G16-19 (RCMT) or G20-12 (RCID) - Body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 14. |
READ VALUE USING TECHSTREAM (REAR SEAT BELT BUCKLE SWITCH (FOR LH)) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(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 | |
Rear Left Seat Buckle / Occupant Detection Warning Switch |
Rear seat inner belt LH (for LH) buckle signal |
ON or OFF | OFF: Rear LH seat belt (for LH) fastened
ON: Rear LH seat belt (for LH) not fastened |
- | Body Electrical > Combination Meter > Data List
|
Tester Display | | Rear Left Seat Buckle / Occupant Detection Warning Switch |
|
Result | Proceed to | |
ON or OFF does not appear on the Techstream according to the rear seat belt condition |
A | | ON or OFF appears on the Techstream according to the rear seat belt condition |
B |
| B |
| GO TO STEP 16 |
|
A | |
| |
| 15. |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER BELT ASSEMBLY LH - BODY GROUND) |
(a) Disconnect the G16 combination meter assembly connector. (b) Disconnect the K56 rear seat inner belt assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G16-24 (RLSB) - K56-4 (LBR+) |
Always | Below 1 Ω | |
G16-24 (RLSB) or K56-4 (LBR+) - Body ground |
Always | 10 kΩ or higher | |
K56-3 (LBR-) - Body ground |
Always | Below 1 Ω |
| OK |
| REPLACE REAR SEAT INNER BELT ASSEMBLY LH |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 16. |
PERFORM ACTIVE TEST USING TECHSTREAM (REAR SEAT BELT WARNING LIGHT) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Perform the Active Test according to the display on the Techstream. Body Electrical > Combination Meter > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Rear Seat Belt Warning |
Rear seat belt warning light |
OFF/ON | - | Body Electrical > Combination Meter > Active Test
|
Tester Display | | Rear Seat Belt Warning |
|
Result | Proceed to | |
The rear seat belt warning light does not operate normally |
A | | The rear seat belt warning light operates normally |
B |
| B |
| REPLACE COMBINATION METER ASSEMBLY |
|
A | |
| |
| 17. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY) |
(a) Disconnect the G16 combination meter assembly connector. (b) Disconnect the G20 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G16-18 (RLMT) - G20-5 (RLID) |
Always | Below 1 Ω | |
G16-18 (RLMT) or G20-5 (RLID) - Body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
