Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FJ1Z
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 -           ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM: B1279; Lost Communication with Humidity/Rain Sensor LIN; 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]

DTC

B1279

Lost Communication with Humidity/Rain Sensor LIN

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

B1279

Lost Communication with Humidity/Rain Sensor LIN

DTC Detection Condition:

  • Ignition switch ON (IG+ voltage 9.5 V or higher)

Malfunction Status:

  • Communication malfunction with rain sensor

Malfunction Duration:

  • Continues for 10 seconds or more
  • Rain sensor
  • Harness or connector

○

Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect fuse for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTC.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs

(b) Turn the ignition switch to ON and wait for at least 10 seconds.

(c) Check for DTCs.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; WIPER / WASHER: WIPER AND WASHER SYSTEM: DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B1279 is not output.

A

DTC B1279 is output.

B

DTC B1279 and DTC B1373 are output.

C
A

USE SIMULATION METHOD TO CHECK

C

GO TO DTC B1373

B

2.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR)

(a) Disconnect the G43 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the P6 rain sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G43-3 (LIN3) - P6-3 (MPX)

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

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

(a) Disconnect the rain sensor connector.

*a

Front view of wire harness connector

(to Rain Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P6-2 (ES) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P6-4 (SIG) - Body ground

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V
OK

REPLACE RAIN SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR