Lexus NX: 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 .gif)
| 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 | - |
| Tester Display |
|---|
| Front Window Washer Switch |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| NG | .gif) | GO TO STEP 7 |
|
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| 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 |
|
| 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. |
|
(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 |
|
| 4. | CHECK HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY CIRCUIT |
| (a) Remove the headlight cleaner control relay from the No. 2 engine room relay block. |
|
(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 |
|
| 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. |
|
(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 |
|
| 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. |
|
(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 |
|
| 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 |
|
| 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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