DTC B1279: Lost Communication with Humidity/Rain Sensor LIN [04/2018 - 08/2020]: Procedure
WARNING: This page is about a different variant/trim than selected.
- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING THERMISTOR ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
- Disconnect the G32 main body ECU (multiplex network body ECU) connector.
- Disconnect the O4 air conditioning thermistor assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition O4-3 (MPX) - G32-3 (LIN3) Always Below 1 Ω O4-3 (MPX) or G32-3 (LIN3) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*a Component without harness connected
(Main Body ECU (Multiplex Network Body ECU))- Using an oscilloscope, check the waveform.
OK
Tester Connection Condition Specified Condition G32-3 (LIN3) -Body ground Power switch on (IG) Pulse generation Result
Proceed to OK NG
Result:
OK
REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY. Refer to REMOVAL [04/2018 - 08/2020]
Result:
NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [04/2018 - 08/2021]
- Using an oscilloscope, check the waveform.