Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Wiper Motor Power Source Circuit

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Wiper Motor Power Source Circuit

DESCRIPTION

This circuit is the power source circuit for the combination meter assembly. This circuit provides two types of power sources; one is a constant power source, and the other is an IG power source.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses of circuits related to this system before performing the following procedure.

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

Status of Power Supply Voltage

Front wiper motor and link assembly input voltage

Normal or Abnormal

Normal: 6.6 to 17.9 V

Abnormal: Below 6.5 V or 18.0 V Higher

-
Body Electrical > Wiper > Data List

Tester Display

Status of 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 (FRONT WIPER MOTOR AND LINK ASSEMBLY - BODY GROUND)

(a) Disconnect the i1 front wiper motor and link assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

i1-4 (+S) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 9

OK

3.

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

i1-3 (L) - Body ground

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V
OK

REPLACE FRONT WIPER MOTOR AND LINK ASSEMBLY

NG

4.

CHECK WIPER MOTOR WIRE

(a) Remove the wiper motor wire.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

i1-3 (L) - iA1-2

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Front Wiper Motor and Link Assembly)

*b

Front view of wire harness connector

(to Wire Harness)
NG

REPLACE WIPER MOTOR WIRE

OK

5.

INSPECT WIPER RELAY

(a) Remove the WIPER relay.

(b) Inspect the WIPER relay.

Click here

NG

REPLACE WIPER RELAY
OK

6.

CHECK HARNESS AND CONNECTOR (FRONT WIPER MOTOR AND LINK ASSEMBLY - POWER SOURCE, BODY GROUND)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

5 - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to WIPER relay)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (WIPER RELAY - FRONT WIPER MOTOR AND LINK ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - i1-3 (L)

Always

Below 1 Ω

3 or i1-3 (L) - 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 J8 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 - J8-9 (PWS)

Always

Below 1 Ω

1 or J8-9 (PWS) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK WIPER MOTOR WIRE

(a) Remove the wiper motor wire.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

i1-4 (+S) - iA1-3

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Front Wiper Motor and Link Assembly)

*b

Front view of wire harness connector

(to Wire Harness)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE WIPER MOTOR WIRE

    Rain Sensor Malfunction (B1400)
    DESCRIPTION This DTC is stored when the rain sensor detects an internal malfunction. DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from B1400 Rain Se ...

    Headlight Cleaner Motor and Relay Circuit
    DESCRIPTION The headlight cleaner motor and pump assembly is controlled by the headlight ECU sub-assembly RH. When the headlight ECU sub-assembly RH receives the washer switch operation signal 5 times ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Pre-collision System: Fail-safe Chart
    FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) When a malfunction occurs in the pre-collision system, a message will be displayed on the multi-information display and the pre-collision system will be disabled depending on the malfunction. Warning Message Cause DTC/RoB No. Conditions to Return to No ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Wiper And Washer System: Lost Communication with Wiper System LIN BUS (B1373)
    DESCRIPTION The main body ECU (multiplex network body ECU) communicates with the windshield wiper motor and link assembly (wiper ECU), windshield wiper switch assembly and rain sensor via LIN communication. If a malfunction occurs in the LIN communication line and a communication error occurs, this ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2026 Copyright www.lexusrx.net
    0.0123