Toyota Yaris: Seat Belt Warning System / Terminals Of Ecu
TERMINALS OF ECU
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY
| *1 | Power Distribution Box Assembly | *2 | Main Body ECU (Multiplex Network Body ECU) |
(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
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(b) Reconnect the power distribution box assembly connectors.
(c) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| MB-26 (BECU) - Body ground | Auxiliary battery power supply | Ignition switch off | 11 to 14 V |
| MB-27 (IGR) - Body ground | Ignition power supply (IG signal) | Ignition switch ON | 11 to 14 V |
| Ignition switch off | Below 1 V | ||
| MB-13 (GND1) - Body ground | Ground | Always | Below 1 Ω |
(d) Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.
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(e) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| 4E-3 - Body ground | Front door courtesy light switch LH signal | Front door LH open | 11 to 14 V |
| Front door LH closed | Below 1 V | ||
| 4E-5 - Body ground | Front door courtesy light switch RH signal | Front door RH open | 11 to 14 V |
| Front door RH closed | Below 1 V | ||
| 4E-8 - Body ground | Rear RH seat belt buckle switch signal | Rear RH seat belt fastened | 11 to 14 V |
| Rear RH seat belt not fastened | Below 1 V | ||
| 4E-11 - Body ground | Front passenger side seat belt buckle switch signal | Front passenger side seat belt fastened | 11 to 14 V |
| Front passenger side seat belt not fastened | Below 1 V | ||
| 4E-19 - Body ground | Rear LH seat belt buckle switch signal | Rear LH seat belt fastened | 11 to 14 V |
| Rear LH seat belt not fastened | Below 1 V | ||
| 4E-29 - Body ground | Passenger seat occupant detection sensor signal | Ignition switch ON, front passenger seat occupied | Below 1 V |
| Ignition switch ON, front passenger seat not occupied | 11 to 14 V |
CHECK COMBINATION METER ASSEMBLY
(a) Disconnect the H6 combination meter assembly connectors.
(b) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| H6-22 (B) - Body ground | Auxiliary battery power supply | Ignition switch off | 11 to 14 V |
| H6-38 (IG+) - Body ground | Ignition power supply (IG signal) | Ignition switch off | Below 1 Ω |
| Ignition switch ON | 10.5 to 16 V | ||
| H6-23 (ES) - Body ground | Ground | Always | Below 1 Ω |
(c) Connect the H7 combination meter assembly connectors.
(d) Measure the resistance and voltage according to the value(s) in the table below.
HINT:
Measure the values on the wire harness side with the connector disconnected.
| Terminal No. (Symbol) | Terminal Description | Condition | Specified Condition |
|---|---|---|---|
| H7-34 (BKL) - Body ground | Driver seat belt buckle switch signal | Driver seat belt fastened | 10 kΩ or higher |
| Driver seat belt unfastened | Below 1 Ω |
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not...
On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT DRIVER SEAT BELT WARNING LIGHT HINT: The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat...
Other information:
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Turning the Engine Off
Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.