Wiper / Washer (Diagnostics & Circuit Tests): Overview Lexus LX J200

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COMMUNICATION TABLE

HINT

1. Wiper operation is controlled by the main body ECU.
2. The rain sensor controls the auto wiper function.

SYSTEM DESCRIPTION

1. FRONT WIPER SYSTEM The front wiper system receives the wiper operation signal from the windshield wiper switch, and the windshield wiper ECU operates the front wiper motor. The windshield wiper ECU adjusts the intermittent interval during front wiper motor operation according to commands received from the windshield wiper switch. This adjustment is based on vehicle speed, brake signals, etc., and a determination of the vehicle driving and stopping conditions during the intermittent operation. The system has the following functions: Function Outline Vehicle speed sensing intermittent wiper function* This function controls the intermittent interval of the wipers according to the vehicle speed when the wiper switch is in the INT position. Vehicle speed switching function This function automatically switches the wipers on or off when the vehicle is stopped or starts moving with the wiper switch in the LO position. HINT: *: The vehicle speed sensing intermittent wiper function operates even when the fail-safe function operates due to a malfunction in the auto wiper function.
2. FRONT WASHER SYSTEM The front washer system receives the wiper operation signal from the windshield wiper switch, and the windshield wiper ECU operates the front washer motor.
3. CONTINUOUS FRONT WASHER WIPER SYSTEM The continuous front washer system receives the washer operation signal from the windshield wiper switch, and the windshield wiper ECU operates the front wiper motor. The front wipers are operated 3 times after the front washer is stopped. The front wiper stops after operating 3 times from the point where the front washer switch has been on for more than 40 seconds continuously. The front wipers are then operated once at an interval of 3 to 7 seconds. The interval is determined by the vehicle speed signal received from the combination meter.
4. AUTOMATIC WIPER SYSTEM In the automatic wiper system, the rain sensor mounted in the upper portion of the windshield sends a front wiper operation command, based on the amount of rainfall, to the windshield wiper ECU. The front wipers operate when the windshield wiper switch is in the AUTO position. The rain sensor sensitivity can be adjusted with the rain sensor adjusting switch. In this system, the windshield wiper ECU receives the vehicle speed signal from the combination meter, and operates the front wipers according to the vehicle speed. The windshield wiper ECU adjusts the intermittent interval during wiper motor operation according to commands received from the rain sensor. This adjustment is based on vehicle speed, etc., and a determination of the vehicle driving and stopping conditions during the intermittent operation.
5. HEADLIGHT CLEANER SYSTEM The headlight cleaner system operates when the headlights are on and the headlight cleaner switch is pushed on.
6. REAR WIPER SYSTEM In the rear wiper system, a rear wiper operation signal is sent from the windshield wiper switch to the No. 2 main body ECU. The No. 2 main body ECU receives the rear wiper operation signal and operates the rear wiper.
7. REVERSE-LINKED SYSTEM In the reverse-linked system, with the front wipers operating, the reverse position signal is sent from the ECM to the No. 2 main body ECU. The No. 2 main body ECU receives the reverse position signal and operates the rear wiper once.

DESCRIPTION

The windshield wiper ECU controls the wiper motor.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (FRONT WIPER MOTOR) Using the Techstream, perform the Active Test. NOTE: When a Body No. 5 (windshield wiper ECU) related front wiper switch is on, Active Test items related to the front wiper switch are prohibited (double operation prohibition). Check that the front wiper switches are off before performing Active Test. BODY NO. 5 Item Test Details Control Range Diagnostic Note Wiper Motor HI Wiper motor HI operation ON / OFF - Wiper Motor LO Wiper motor LO operation ON / OFF - OK Front wiper motor operates. NG --> See step 2 OK --> See step 4
2. INSPECT FRONT WIPER MOTOR Remove the front wiper motor. Refer to «REMOVAL». Apply battery voltage to the front wiper motor connector and check the speed of the front wiper motor. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal 1 (+1) Battery negative (-) --> Terminal 5 (E) Motor operates at low speed Battery positive (+) --> Terminal 4 (+2) Battery negative (-) --> Terminal 5 (E) Motor operates at high speed NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (FRONT WIPER MOTOR - WINDSHIELD WIPER ECU AND BODY GROUND) Disconnect the A22 motor connector. Disconnect the E89 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A22-2 (B) - E89-8 (WIG) Always Below 1 ohms A22-1 (+1) - E89-1 (+1) A22-4 (+2) - E89-2 (+2) A22-3 (+S) - E89-7 (+SM) A22-5 (E) - Body ground A22-3 (+S) - Body ground Always 10 kohms or higher A22-2 (B) - Body ground A22-4 (+2) - Body ground A22-1 (+1) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
5. REPLACE FRONT WIPER MOTOR. Refer to «REMOVAL»
6. REPLACE WINDSHIELD WIPER ECU. Refer to «REMOVAL»

The No. 2 main body ECU controls the rear wiper motor.

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1. PERFORM ACTIVE TEST USING TECHSTREAM (REAR WIPER MOTOR) Using the Techstream, perform the Active Test. BODY NO. 4 Item Test Details Control Range Diagnostic Note Rear Wiper Lo Rear wiper motor LO operation ON / OFF - OK Rear wiper motor operates. NG --> See step 2 OK --> See step 5
2. INSPECT REAR WIPER MOTOR Remove the rear wiper motor. Refer to «REMOVAL». Apply battery voltage to the rear wiper motor connector and check if the rear wiper motor operates. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal 3 (+1) Battery negative (-) --> Terminal 4 (E) Motor operates NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (REAR WIPER MOTOR - NO. 2 MAIN BODY ECU AND BODY GROUND) Disconnect the S6 motor connector. Disconnect the L33 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition S6-2 (B) - L33-3 (W) Always Below 1 ohms S6-3 (+1) - L33-2 (RWLM) S6-1 (S) - L33-1 (RWSM) S6-4 (E) - Body ground S6-2 (B) - Body ground Always 10 kohms or higher S6-3 (+1) - Body ground S6-1 (S) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
4. REPLACE NO. 2 MAIN BODY ECU. Refer to «REMOVAL»
5. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
6. REPLACE REAR WIPER MOTOR. Refer to «REMOVAL»

The windshield wiper ECU receives the HI position signal of the wiper switch to operate the wiper motor at HI speed. Even if the ECU malfunctions, its circuit structure enables it to operate the wiper in HI operation mode.

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1. READ VALUE USING TECHSTREAM (WINDSHIELD WIPER SWITCH ASSEMBLY) Using the Techstream, read the Data List. BODY NO. 5 Tester Display Measurement Item/Range Normal Condition Diagnostic Note Front Wiper Hi Switch Front wiper HI switch / ON or OFF ON: Front wiper switch in HI position OFF: Wiper switch not in HI position - OK Wiper switch operates. NG --> See step 2 OK --> See step 4
2. INSPECT WINDSHIELD WIPER SWITCH Remove the windshield wiper switch. Refer to «REMOVAL». Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 4 (+2) - 2 (+B) Wiper switch in HI position Below 1 ohms 4 (+2) - 2 (+B) Wiper switch not in HI position 10 kohms or higher NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - WINDSHIELD WIPER ECU) Disconnect the E16 switch connector. Disconnect the E89 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E16-4 (+2) - E89-9 (2S) Always Below 1 ohms E16-2 (+B) - E89-6 (ES) E89-9 (2S) - Body ground Always 10 kohms or higher E89-6 (ES) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
4. REPLACE WINDSHIELD WIPER ECU. Refer to «REMOVAL»
5. REPLACE WINDSHIELD WIPER SWITCH. Refer to «REMOVAL»

This circuit provides power to operate the windshield wiper switch. The manual operation signals are sent to the windshield wiper ECU.

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1. INSPECT FUSE (ECU-IG No. 1) Remove the ECU-IG No. 1 fuse from the cowl side junction block LH. Measure the resistance according to the value in the table below. Standard Resistance Tester Connection Condition Specified Condition ECU-IG No. 1 fuse Always Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
2. READ VALUE USING TECHSTREAM (WINDSHIELD WIPER SWITCH) Using the Techstream, read the Data List. BODY NO. 5 Tester Display Measurement Item/Range Normal Condition Diagnostic Note Wiper Lo Switch Front wiper LO switch / ON or OFF ON: Front wiper switch in LO OFF: Front wiper switch not in LO - Wiper Hi Switch Front wiper HI switch / ON or OFF ON: Front wiper switch in HI OFF: Front wiper switch not in HI - Wiper Auto Switch Front wiper AUTO switch / ON or OFF ON: Front wiper switch in AUTO OFF: Front wiper switch not in AUTO - Wiper Mist Switch Front wiper MIST switch / ON or OFF ON: Front wiper switch in MIST OFF: Front wiper switch not in MIST - Washer Switch Front washer switch / ON or OFF ON: Front washer switch on OFF: Front washer switch off - BODY NO. 4 Tester Display Measurement Item/Range Normal Condition Diagnostic Note Rear Wiper Lo Switch Rear wiper LO switch / ON or OFF ON: Rear wiper switch in LO OFF: Rear wiper switch not in LO - Rear Wiper Int Switch Rear wiper INT switch / ON or OFF ON: Rear wiper switch in INT OFF: Rear wiper switch not in INT - Rear Washer Switch Rear washer switch / ON or OFF ON: Rear washer switch on OFF: Rear washer switch off - OK The display is as specified in the normal condition. NG --> See step 3 OK --> See step 4
3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BATTERY AND BODY GROUND) Disconnect the E16 switch connector. Disconnect the E89 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E16-2 (+B) - E89-6 (ES) Always Below 1 ohms E16-10 (E) - Body ground E16-2 (+B) - Body ground 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
4. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
5. REPLACE WINDSHIELD WIPER SWITCH. Refer to «REMOVAL»

The auto wiper system adjusts the wiper speed to the optimum speed based on the amount of rain. The rain sensor mounted on the windshield detects rainfall. This system operates when the windshield wiper switch is set to AUTO. The rain sensor sensitivity can be adjusted with the rain sensor adjusting switch. Signals are sent to the windshield wiper ECU from the windshield wiper switch through the CAN line, and from the rains sensor through the LIN line. Based on these signals, the windshield wiper ECU operates the wiper and determines its operation speed.

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This circuit detects the conditions of the headlight cleaner switch.

1. Headlight cleaner switch signal
2. Headlight operating signal
3. Daytime running light operating signal
4. Front washer motor operating signal

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1. CHECK HEADLIGHT ASSEMBLY (LO BEAM) Check that the headlights illuminate in LO beam. OK Headlights illuminate in LO beam NG --> See step 5 OK: Go to next step
2. INSPECT OUTER MIRROR SWITCH ASSEMBLY Disconnect the E95 cleaner switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 3 (B) - 4 (L) Headlight cleaner switch off 10 kohms or higher 3 (B) - 4 (L) Headlight cleaner switch on Below 1 ohms NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (OUTER MIRROR SWITCH - HEADLIGHT CLEANER CONTROL RELAY AND MAIN BODY ECU) Disconnect the relay connector. Disconnect the E95 switch connector. Disconnect the 2D main body ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (H) - E95-3 (B) Always Below 1 ohms E95-4 (L) - 2D-23 (HRLY) 2 (H) - Body ground Always 10 kohms or higher E95-3 (B) - Body ground E95-4 (L) - Body ground 2D-23 (HRLY) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
4. REPLACE HEADLIGHT CLEANER CONTROL RELAY. Refer to «REMOVAL»(/lexus/lx/j200-2007-2012/remont/wiperwasher-systems/#wiper-washer-relay-service-information)
5. GO TO LIGHTING SYSTEM. Refer to «PROBLEM SYMPTOMS TABLE»
6. REPLACE OUTER MIRROR SWITCH ASSEMBLY. Refer to «REMOVAL»

This circuit provides power to the headlight cleaner control relay.

The headlight cleaner control relay sends the signal from the switch, etc. to the headlight cleaner motor to operate the headlight cleaner system.

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1. INSPECT FUSE (ECU-IG No. 1, H-LP CLR) Remove the ECU-IG No. 1 fuse from the cowl side junction block LH. Remove the H-LP CLR fuse from the engine relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition ECU-IG No. 1 fuse Always Below 1 ohms H-LP CLR fuse NG --> REPLACE FUSE OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BATTERY AND BODY GROUND) Disconnect the relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition 3 (IG) - Body ground Engine switch on (IG) 11 to 14 V 3 (IG) - Body ground Engine switch off Below 1 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 4 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY Remove the headlight cleaner motor. Refer to «REMOVAL». Apply battery voltage to the headlight cleaner motor connector and check the operation of the headlight cleaner motor. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal 1 Battery negative (-) --> Terminal 2 Headlight cleaner motor operation is normal NG --> See step 6 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (CLEANER MOTOR - CONTROL RELAY AND BATTERY) Disconnect the cleaner motor connector. Disconnect the control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 1 - Body ground Always 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 - 6 (PB) Always Below 1 ohms 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
5. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»
6. REPLACE HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY. Refer to «REMOVAL»

The windshield wiper ECU receives washer switch information from the front wiper switch, and operates the washer motor.

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1. INSPECT FRONT WASHER MOTOR Remove the front washer motor. Refer to «REMOVAL». Apply battery voltage to the windshield washer motor connector and check the operation of the windshield washer motor. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal 1 Battery negative (-) --> Terminal 2 Front washer motor operation is normal NG --> See step 9 OK: Go to next step
2. INSPECT REAR WASHER MOTOR Remove the rear washer motor. Refer to «REMOVAL». Apply battery voltage to the windshield washer motor connector and check the operation of the windshield washer motor. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal 1 Battery negative (-) --> Terminal 2 Rear washer motor operation is normal NG --> See step 10 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (FRONT WASHER MOTOR - BATTERY) Disconnect the front washer motor connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition 1 - Body ground Engine switch on (IG) 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (REAR WASHER MOTOR - BATTERY) Disconnect the rear washer motor connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition 1 - Body ground Engine switch on (IG) 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BODY GROUND) Disconnect the E15 windshield wiper switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E15-2 (EW) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FRONT WASHER MOTOR - WINDSHIELD WIPER SWITCH) Disconnect the E15 windshield wiper switch connector. Disconnect the washer motor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 - E15-3 (WF) Always Below 1 ohms 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (REAR WASHER MOTOR - WINDSHIELD WIPER SWITCH) Disconnect the E16 windshield wiper switch connector. Disconnect the washer motor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 - E16-5 (WR) Always Below 1 ohms 2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
8. REPLACE WINDSHIELD WIPER SWITCH. Refer to «REMOVAL»
9. REPLACE FRONT WASHER MOTOR. Refer to «REMOVAL»
10. REPLACE REAR WASHER MOTOR. Refer to «REMOVAL»

This circuit provides power to the windshield wiper ECU and operates the front wiper motor.

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1. INSPECT FUSE (ECU-IG No. 1) Remove the ECU-IG No. 1 fuse from the cowl side junction block LH. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition ECU-IG No. 1 fuse Always Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER ECU - BATTERY AND BODY GROUND) Disconnect the E89 and E90 windshield wiper ECU connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition E89-5 (IG1I) - Body ground Engine switch on (IG) 11 to 14 V E89-5 (IG1I) - Body ground Engine switch off Below 1 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E90-10 (E) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
3. REPLACE WINDSHIELD WIPER ECU. Refer to «REMOVAL»

See also:
• REMOVAL