DTC B1279: Rain Sensor Communication Stop: Procedure

CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - BATTERY AND BODY GROUND)

Disconnect the R5 connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
R5-19 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

Standard Resistance

Tester Connection	Condition	Specified Condition
R5-31 (GND) - Body ground	Always	Below 1 Ω
R5-32 (GND3) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Overhead Junction Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BATTERY AND BODY GROUND)

Reconnect the R5 connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
R7-1 (SIG) - Body ground	Engine switch on (IG)	11 to 14 V

Standard Resistance

Tester Connection	Condition	Specified Condition
R7-3 (ES) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Rain Sensor)

NG → See step 4

OK: Go to next step

CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

Disconnect the 2F and J55 connectors.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
R7-2 (MPX) - J55-24 (MPX2)	Always	Below 1 Ω
R7-2 (MPX) - 2F-5 (MPX1)	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Rain Sensor)	*2	Front view of wire harness connector (to Front Controller (Engine Room Relay Block No. 2))
*3	Front view of wire harness connector (to Power Source Control ECU)	-	-

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 5

CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - RAIN SENSOR)

Disconnect the R5 connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
R7-3 (ES) - R5-16 (GND2)	Always	Below 1Ω
R7-1 (SIG) - R5-17 (IG2)	Always	Below 1Ω

TEXT IN ILLUSTRATION

*1	Front view of wire harness connector (to Rain Sensor)
*2	Front view of wire harness connector (to Overhead Junction Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (OVERHEAD JUNCTION BLOCK - RAIN SENSOR)

OK → REPLACE OVERHEAD JUNCTION BLOCK