Lexus ES manuals

Lexus ES: Lost Communication with Wiper ECU LIN (B1245)

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper motor assembly 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

B1245

Lost Communication with Wiper ECU LIN

  • Battery voltage is 9.5 V or more
  • A communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper motor assembly
  • 10 seconds or more
  • Windshield wiper motor assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector

Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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 engine 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 B1245 is output

A

DTC B1245 and B1373 are output

B

B

GO TO B1373

A

2.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - WINDSHIELD WIPER MOTOR ASSEMBLY)

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

(b) Disconnect the A38 windshield wiper motor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G36-3 (LIN3) - A38-2 (LIN)

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

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

4.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER MOTOR ASSEMBLY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A38-4 (+B) - Body ground

Engine switch on (IG)

11 to 14 V

Less than approximately 60 seconds after engine switch turned off

11 to 14 V

Approximately 60 seconds after engine switch turned off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A38-1 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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