Lexus ES manuals

Lexus ES: Lost Communication with Humidity/Rain Sensor LIN (B1279)

Lexus ES (XZ10) Service Manual / Vehicle Interior / Wiper / Washer / Wiper And Washer System (for Hv Model) / Lost Communication with Humidity/Rain Sensor LIN (B1279)

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
  • Auxiliary battery voltage is 9.5 V or more
  • Communication malfunction with rain sensor
  • 10 seconds or more
  • Rain sensor
  • Harness or connector
  • Main body ECU (multiplex network body ECU)

○

Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses of circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

Only DTC B1279 is output

A

DTC B1279 and B1373 are output

B
B

GO TO DTC B1373

A

2.

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

(a) Disconnect the G36 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the P2 rain sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G36-3 (LIN3) - P2-3 (MPX)

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

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

Condition

Specified Condition

G36-3 (LIN3) - Body ground

Power switch off

Below 1 V

Power switch on (IG)

Pulse generation
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

4.

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

Condition

Specified Condition

P2-4 (SIG) - Body ground

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V
NG

GO TO STEP 7

OK

5.

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

P2-2 (ES) - Body ground

Always

Below 1 Ω
OK

REPLACE RAIN SENSOR

NG

6.

INSPECT MAP LIGHT SUB-ASSEMBLY

*a

Component without harness connected

(Map Light Sub-assembly)

(a) Remove the map light sub-assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P13-19 (GND) - P13-21 (GND2)

Always

Below 1 Ω
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE MAP LIGHT SUB-ASSEMBLY

7.

INSPECT MAP LIGHT SUB-ASSEMBLY

*a

Component without harness connected

(Map Light Sub-assembly)

(a) Remove the map light sub-assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P13-1 (IG) - P13-14 (IG2)

Always

Below 1 Ω
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE MAP LIGHT SUB-ASSEMBLY

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