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:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Terminals Of Ecu
TERMINALS OF ECU CHECK STEREO COMPONENT EQUALIZER ASSEMBLY Terminal No. (Symbol) Terminal Description Condition Specified Condition O131-15(+B) - O131-30(GND) Power source Always 11 to 14 V O131-29(IGP) - O131-30(GND) Power source (IG) Ignition switch ON 11 to 14 V O131-14(ACC) - O131-30(GND) Power source (ACC) Ignition switch ACC 11 to 14 V O131-30(GND) - Body ground Ground Always Below 1 Ω O132-1(MC1+) - O131-30(GND) Active noise control microphone input signal Active noise control microphone LH tapped with finger Pulse generation O132-5(MC1-) - O131-30(GND) Active noise control microphone input signal Always Below 1 Ω O132-2(MC2+) - O131-30(GND) Active noise control microphone input signal Active noise control microphone RH tapped with finger Pulse generation O132-6(MC2-) - O131-30(GND) Active noise control microphone input signal Always Below 1 Ω O131-3(NEI) - O131-30(GND) Engine pulse signal Idling with warm engine Pulse generation (See waveform 1) O131-24(FLI-) Active noise control microphone output signal - - O131-9(FLI+) Active noise control microphone output signal - - O131-23(FRI-) Active noise control microphone output signal - - O131-8(FRI+) Active noise control microphone output signal - - O131-5(RRI+) Active noise control microphone output signal - - O131-20(RRI-) Active noise control microphone output signal - - O131-6(RLI+) Active noise control microphone output signal - - O131-21(RLI-) Active noise control microphone output signal - - O131-7(ASG1) Shield ground - - O131-22(ASG2) Shield ground - - O131-12(FR+) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-27(FR-) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-13(FL+) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-28(FL-) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-10(RR+) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131+25(RR-) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-11(RL+) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-28(RL-) - O131-30(GND) Sound signal Active noise control system operating Pulse generation O131-1(CANH) CAN communication signal - - O131-16(CANL) CAN communication signal - - (a) Waveform 1 HINT: The oscilloscope waveform shown in the illustration is an example for reference only...
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: SRS Warning Light does not Come ON
DESCRIPTION The SRS warning light is located in the combination meter assembly. When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then turns off automatically. If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem...
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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.