Toyota Yaris: Wiper And Washer System / Humidity/Rain Sensor Missing Message (B127987)
DESCRIPTION
The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | DTC Output from |
|---|---|---|---|---|---|
| B127987 | Humidity/Rain Sensor Missing Message |
|
| ○ | Main Body |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses of circuits related to this system before performing the following procedure.
-
If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration.
Click here
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - RAIN SENSOR) |
(a) Disconnect the H5 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the V9 rain sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| H5-11 (LIN4) - V9-3 (MPX) | Always | Below 1 Ω |
| NG |
.gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| *a | Component without harness connected (Main Body ECU (Multiplex Network Body ECU) |
(a) Check for voltage and pulses according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| H5-11 (LIN4) - Body ground | Ignition switch ON | Pulse generation |
| NG |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 3. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - RAIN SENSOR) |
| *a | Front view of wire harness connector (to Rain Sensor) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| V9-4 (SIG) - Body ground | Ignition switch off | Below 1 V |
| Ignition switch ON | 11 to 14 V |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BODY GROUND) |
| *a | Front view of wire harness connector (to Rain Sensor) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| V9-2 (ES) - Body ground | Always | Below 1 Ω |
| OK |
| REPLACE RAIN SENSOR |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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DESCRIPTION This DTC is stored when the rain sensor detects an internal malfunction. DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from B1400 Rain Sensor Malfunction
IG power source voltage is 9...
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Break-In Period
No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.
Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.