Lexus ES manuals

Lexus ES: Wiper Motor Power Source Circuit

DESCRIPTION

This circuit is the power source circuit for the windshield wiper motor assembly.

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.

READ VALUE USING TECHSTREAM

(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 / Wiper / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Wiper > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Motor Power Supply Voltage

Front wiper motor assembly supply voltage status

Min.: 0 V

Max.: 63 V

Almost the same as actual windshield wiper motor assembly voltage

-

Body Electrical > Wiper > Data List

Tester Display

Motor Power Supply Voltage

OK:

The Techstream display is normal.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

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

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

(b) 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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

OK

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

NG

4.

INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here

NG

REPLACE WINDSHIELD WIPER RELAY

OK

5.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - WIPER RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3 (WIPER relay) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (WIPER relay) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK HARNESS AND CONNECTOR (WIPER RELAY - WINDSHIELD WIPER MOTOR ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

5 (WIPER relay) - A38-4 (+B)

Always

Below 1 Ω

5 (WIPER relay) or A38-4 (+B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G37 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (WIPER relay) - G37-21 (WPS)

Always

Below 1 Ω

1 (WIPER relay) or G37-21 (WPS) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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