Lexus NX: Headlight Cleaner Motor and Relay Circuit

Lexus NX Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Headlight Cleaner Motor and Relay Circuit

DESCRIPTION

The headlight ECU sub-assembly RH controls the headlight cleaner motor and pump assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • First check that the front washer operates normally.
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM

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

Click here

Body Electrical > AFS > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Front Window Washer Switch

Washer switch condition

ON/OFF

ON: Windshield wiper switch assembly (front washer switch) on

OFF: Windshield wiper switch assembly (front washer switch) off

-

Body Electrical > AFS > Data List

Tester Display

Front Window Washer Switch

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

NG

GO TO STEP 7

OK

2.

INSPECT HEADLIGHT CLEANER CONTROL RELAY

(a) Remove the headlight cleaner control relay from the No. 2 engine room relay block.

(b) Inspect the headlight cleaner control relay.

Click here

NG

REPLACE HEADLIGHT CLEANER CONTROL RELAY

OK

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BATTERY)

(a) Remove the headlight cleaner control relay from the No. 2 engine room relay block.

*a

Front view of wire harness connector

(to Headlight Cleaner Control Relay)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Headlight cleaner control relay terminal 1 - Body ground

Power switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY CIRCUIT

(a) Remove the headlight cleaner control relay from the No. 2 engine room relay block.

*a

Front view of wire harness connector

(to Headlight Cleaner Control Relay)

(b) Using a service wire, connect terminal 3 and body ground.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

(c) Check the headlight cleaner motor and pump assembly operate.

OK:

Headlight cleaner motor and pump assembly operate.

NG

GO TO STEP 8

OK

5.

CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BODY GROUND)

(a) Remove the headlight cleaner control relay from the No. 2 engine room relay block.

*a

Front view of wire harness connector

(to Headlight Cleaner Control Relay)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Headlight cleaner control relay terminal 5 - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Remove the headlight cleaner control relay from the No. 2 engine room relay block.

(b) Disconnect the A20 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Headlight cleaner control relay terminal 2 - A20-7 (HLC)

Always

Below 1 Ω

Headlight cleaner control relay terminal 2 or A20-7 (HLC) - Body ground

Always

10 kΩ or higher

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - WINDSHIELD WIPER SWITCH ASSEMBLY)

(a) Disconnect the A20 headlight ECU sub-assembly RH connector.

(b) Disconnect the I124 windshield wiper switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A20-18 (FRWA) - I124-7 (WF)

Always

Below 1 Ω

A20-18 (FRWA) or I124-7 (WF) - Body ground

Always

10 kΩ or higher

OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY - BATTERY)

(a) Disconnect the headlight cleaner motor and pump assembly connector.

*a

Front view of wire harness connector

(to Headlight Cleaner Motor and Pump Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A24-2 - Body ground

Power switch off

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

INSPECT HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY

(a) Disconnect the A24 headlight cleaner motor and pump assembly connector.

(b) Inspect the headlight cleaner motor and pump assembly.

Click here

NG

REPLACE HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY

OK

10.

CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY)

(a) Disconnect the A24 headlight cleaner motor and pump assembly connector.

(b) Remove the headlight cleaner control relay from the No. 2 engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-1 - Headlight cleaner control relay terminal 3

Always

Below 1 Ω

A24-1 or headlight cleaner control relay terminal 3 - Body ground

Always

10 kΩ or higher

OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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