Toyota Yaris: Seat Belt Warning System / Front Passenger Side Seat Belt Warning Light does not Operate
DESCRIPTION
The combination meter assembly blinks or turns off the passenger seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly RH and occupant detection sensor (separate type front seat cushion pad RH).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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.
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 GTS (PASSENGER SEAT BUCKLE SWITCH STATUS / PASSENGER SEAT OCCUPANT SENSOR STATUS) |
(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 |
|---|---|---|---|---|
| Passenger Seat Buckle Switch Status | Passenger side seat belt buckle switch status | Set, Unset, Unknown | Set: Passenger seat belt fastened Unset: Passenger seat belt not fastened Unknown: Data is not determined | - |
| Passenger Seat Occupant Sensor Status | Passenger seat occupant detection sensor status | OFF, ON, Unknown | OFF: Passenger seat not occupied ON: Passenger seat occupied Unknown: Data is not determined | - |
| Tester Display |
|---|
| Passenger Seat Buckle Switch Status |
| Passenger Seat Occupant Sensor Status |
OK:
The GTS display changes correctly in response to the front passenger seat belt and front passenger seat condition.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (Passenger Seat Buckle Switch Status) | B |
| NG (Passenger Seat Occupant Sensor Status) | C |
| B |
 | GO TO STEP 3 |
| C |
 | GO TO STEP 5 |
|
| 2. | PERFORM ACTIVE TEST USING GTS (DRIVER SIDE SEAT BELT WARNING) |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Combination Meter > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Driver Side Seat Belt Warning | Front seat belt warning light | ON or OFF | - |
| OK |
 | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
| NG |
 | REPLACE COMBINATION METER ASSEMBLY |
| 3. | INSPECT FRONT SEAT INNER BELT ASSEMBLY RH |
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| NG |
 | REPLACE FRONT SEAT INNER BELT ASSEMBLY RH |
|
| 4. | CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND) |
(a) Disconnect the 4E 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 |
|---|---|---|
| O17-3 (+) - 4E-11 | Always | Below 1 Ω |
| O17-3 (+) or 4E-11 - Body ground | Always | 10 kΩ or higher |
| O17-2 (E) - Body ground | Always | Below 1 Ω |
| OK |
 | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | INSPECT FRONT SEAT INNER BELT ASSEMBLY RH |
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| NG |
 | REPLACE FRONT SEAT INNER BELT ASSEMBLY RH |
|
| 6. | INSPECT OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD RH) |
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| NG |
 | REPLACE OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD RH) |
|
| 7. | CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND) |
(a) Disconnect the 4E 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 |
|---|---|---|
| O17-5 (+) - 4E-29 | Always | Below 1 Ω |
| O17-5 (+) or 4E-29 - Body ground | Always | 10 kΩ or higher |
| O17-4 (E) - Body ground | Always | Below 1 Ω |
| OK |
 | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Liftgate/Trunk Lid
WARNING
Never allow a person to ride in the luggage compartment/trunk
Allowing a person to ride in the luggage compartment/trunk is dangerous. The person in the luggage compartment/trunk could be seriously injured or killed during sudden braking or a collision.
Do not drive with the liftgate/trunk lid open
