Wiper & Washer: Overview Lexus SC II рестайлинг

SYSTEM DESCRIPTION

1. FRONT WIPER SYSTEM The front wiper system receives wiper operation signals from the combination switch, and the passenger side junction block ECU operates the wiper motor. When the wiper motor is operating intermittently based on signals from the combination switch, the passenger side junction block ECU adjusts the intermittent interval based on the following: 1) vehicle speed, brake signals, etc., and 2) vehicle driving / stopping conditions. FRONT WIPER FUNCTION CHART Function Outline Vehicle speed-sensing, adjustable interval INT function Function controls interval time of wipers in accordance with vehicle speed when wiper switch is in INT position Interval time can be adjusted between approx. 1.5 to 12.5 seconds by operating interval time adjusting knob Interval adjustable range changes automatically in three steps depending on vehicle speed Vehicle speed switching function This function automatically changes wiper system to intermittent operation when wiper switch is in LO position and vehicle is stopped Drip-preventive function After washer-linked function has completed, wipers operate once again to wipe off washer fluid that has dripped
2. FRONT WASHER SYSTEM The front washer system receives wiper operation signals from the combination switch, and the front light ECU operates the washer motor. The system has the following function. FRONT WASHER FUNCTION CHART Function Outline Washer-linked function After washer switch is turned OFF, wipers operate in unison 3 times at low speed This function operates when wiper switch is in OFF or INT position
3. HEADLIGHT CLEANER SYSTEM The headlight cleaner system operates when the headlights are illuminated and the headlight cleaner switch is ON. It also operates when the headlights are illuminated and the front wiper washer system is operating. It does not, however, operate when the daytime driving light system is operating.

DESCRIPTION

The passenger side junction block ECU controls the wiper motor. Even if the ECU is malfunctioning, the wiper motor circuit is designed so that the wiper can still function in HI mode.

Front Wiper Motor - Wiring Diagram. Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WIPER MOTOR) Select the ACTIVE TEST, use the intelligent tester (with CAN VIM) to generate a control command, and then check that the wiper motor operates. Passenger side junction block ECU ACTIVE TEST Item Test Details Diagnostic Note WIPER MOT (HI) Wiper motor HI operation ON / OFF - WIPER MOT (LO) Wiper motor LO operation ON / OFF - OK: Wiper motor operates on HI or LO mode depending on command. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY Check operation. Remove the windshield wiper motor. Apply battery voltage to the wiper motor connector and check the operation of the wiper motor. OK MEASUREMENT CONDITION SPECIFIED CONDITION CHART Measurement Condition Specified Condition Battery positive (+) --> Terminal 5 (+1) Battery negative (-) --> Terminal 4 (E) Motor operates at low speed Battery positive (+) --> Terminal 3 (+2) Battery negative (-) --> Terminal 4 (E) Motor operates at high speed (Scheme 2): Identifying Windshield Wiper Motor Connector Terminals Check automatic stop operation. Connect the battery's positive (+) lead to terminal 5 (+1) and the negative (-) lead to terminal 4 (E), operate the motor at low speed and stop the motor operation anywhere except at the stop position by disconnecting the positive (+) lead. Using a service wire, connect terminals 5 (+1) and 1 (S). Connect the battery's positive (+) lead to terminal 2 (B). Check that the motor operates again and stops at the stop position. (Scheme 3): Checking Automatic Stop Operation NG: REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY OK: Go to next step
3. CHECK WIRE HARNESS (PASSENGER SIDE JUNCTION BLOCK ECU - MOTOR) Disconnect the 3D junction block connector. (Scheme 4): Identifying 3D Junction Block Connector Terminals Disconnect the F9 motor connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3D-6 (WIP) - F9-2 (B) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
4. CHECK WIRE HARNESS (MOTOR - PASSENGER SIDE JUNCTION BLOCK ECU AND BODY GROUND) Disconnect the F9 motor connector. (Scheme 5): Identifying F9 Motor Connector Terminals Disconnect the P6 ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition F9-1 (S) - P6-9 (S/M) Below 1 ohms F9-3 (+2) - P6-2 (+2) Below 1 ohms F9-5 (+1) - P6-1 (S/S) Below 1 ohms F9-4 (E) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The passenger side junction block ECU receives the wiper switch HI position signal and activates the wiper motor at HI speed.

Wiper Switch (HI Speed) - Wiring Diagram. Scheme 6

Scheme 7

1. READ VALUE OF INTELLIGENT TESTER (WIPER SWITCH) Check the DATA LIST for proper functioning of the wiper switch. Passenger side junction block ECU DATA LIST Item Measurement Item / Display (Range) Normal Condition Diagnostic Note WIPER SW (2S) Wiper switch HI / ON or OFF ON: Wiper switch in HI position OFF: Wiper switch not in HI position - OK: ON (wiper switch in HI position) appears on the screen. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. CHECK WIRE HARNESS (ECU - SWITCH) Disconnect the P4 ECU connector. (Scheme 7): Identifying P4 ECU Connector Terminals Disconnect the C11 switch connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition P4-14 (2S) - C11-3 (2S) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This circuit detects the state of the wiper and washer switch and sends it to the passenger side junction block ECU.

This circuit detects the conditions of the headlight cleaner switch.

Headlight Cleaner Switch - Wiring Diagram. Scheme 8

Scheme 9

Scheme 10

Scheme 11

1. INSPECT OUTER MIRROR SWITCH ASSEMBLY (HEADLIGHT CLEANER SWITCH) (Scheme 9): Identifying Outer Mirror Switch Connector Terminals Remove the outer mirror switch. Measure the resistance of the switch. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - 2 ON Below 1 ohms 1 - 2 OFF 10 kohms or higher NG: REPLACE OUTER MIRROR SWITCH ASSEMBLY OK: Go to next step
2. CHECK WIRE HARNESS (SWITCH - ECU AND RELAY) (Scheme 10): Identifying M4 Switch Connector Terminals Disconnect the M4 switch connector. Disconnect the D4 ECU connector. Disconnect the H3 relay connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition M4-1 - D4-16 (HDCL) Below 1 ohms M4-2 - H3-4 (H) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
3. CHECK WIRE HARNESS (ECU - RELAY) Disconnect the D2 ECU connector. Disconnect the H3 relay connector. (Scheme 11): Identifying H3 Relay Connector Terminals Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D2-16 (HDLO) - H3-3 (HDLO) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This circuit detects the conditions of the headlight cleaner motor.

Headlight Cleaner Motor And Relay - Wiring Diagram. Scheme 12

Scheme 13

Scheme 14

Scheme 15

1. INSPECT HEADLIGHT CLEANER WASHER MOTOR AND PUMP ASSEMBLY Remove the washer jar. Apply battery voltage to the headlight cleaner washer motor connector and check the operation of the headlight cleaner washer motor and pump. OK MEASUREMENT CONDITION SPECIFIED CONDITION CHART Measurement Condition Specified Condition Battery positive (+) --> Terminal 1 Battery negative (-) --> Terminal 2 Washer fluid flows from washer jar HINT: This check should be performed with the headlight cleaner washer motor and pump installed to the washer jar. (Scheme 13): Inspecting Headlight Cleaner Washer Motor And Pump Assembly NG: REPLACE HEADLIGHT CLEANER WASHER MOTOR AND PUMP ASSEMBLY OK: Go to next step
2. CHECK WIRE HARNESS (RELAY - BATTERY AND BODY GROUND) Disconnect the H3 relay connector. Measure the voltage of the wire harness side connector. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition H3-1 (IG) - Body ground Ignition switch OFF Below 1 V H3-1 (IG) - Body ground Ignition switch ON 10 to 14 V Measure the resistance of the wire harness side connector. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition H3-5 (E) - Body ground Below 1 V (Scheme 14): Identifying H3 Relay Connector Terminals NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step
3. CHECK WIRE HARNESS (MOTOR AND PUMP - RELAY AND BODY GROUND) Disconnect the H4 motor and pump connector. (Scheme 15): Identifying H4 Motor And Pump Connector Terminals Disconnect the H3 relay connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition H4-2 - H3-2 (PB) Below ohms H4-1 - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The front light ECU receives washer switch information from the combination switch, and operates the washer motor.

Washer Motor - Wiring Diagram. Scheme 16

Scheme 17

Scheme 18

Scheme 19

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WASHER MOTOR) Select the ACTIVE TEST, use the intelligent tester (with CAN VIM) to generate a control command, and then check that the washer motor operates. Front light ECU (Front controller) ACTIVE TEST Item Test Details Diagnostic Note WASHER MOTOR Washer motor operation ON / OFF - OK: Washer motor turns depending on ON / OFF command. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. INSPECT RELAY (Marking: WASH) Remove the WASH relay from the engine room No. 2 relay block. Measure the resistance of the relay. (Scheme 17): Measuring Resistance Between Relay Terminals Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3 - 5 10 kohms or higher Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG: REPLACE RELAY OK: Go to next step
3. INSPECT WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY Remove the washer jar. Apply battery voltage to the windshield washer motor connector and check the operation of the windshield washer motor assembly. OK MEASUREMENT CONDITION SPECIFIED CONDITION CHART Measurement Condition Specified Condition Battery positive (+) --> Terminal 2 Battery negative (-) --> Terminal 1 Washer fluid flows from washer jar HINT: This check should be performed with the windshield washer motor and pump installed to the washer jar. (Scheme 18): Inspecting Windshield Washer Motor And Pump Assembly NG: REPLACE WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY OK: Go to next step
4. CHECK WIRE HARNESS (ECU - BODY GROUND) Remove the front light ECU. (Scheme 19): Identifying Engine Room No.2 Relay Block Using a service wire, connect terminal 3 of the wire harness side connector to the body ground. OK: Front window washer operates. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

The front light ECU receives washer fluid level sensor information, and sends it through the multiplex communication system to the combination meter. The combination meter receives this information and illuminates the washer fluid level warning light when the washer fluid is less than a predetermined value.

Washer Fluid Level Warning Switch - Wiring Diagram. Scheme 20

Scheme 21

Scheme 22

1. READ VALUE OF INTELLIGENT TESTER (WASHER SWITCH) Check the DATA LIST for proper functioning of the washer level switch. Front light ECU (Front controller) DATA LIST Item Measurement Item / Display (Range) Normal Condition Diagnostic Note WASHER LVL SW Washer level switch / ON or OFF ON: Washer jar is empty OFF: Washer jar is full - OK: ON (washer jar is empty) appears on the screen. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE NG: Go to next step
2. INSPECT LEVEL WARNING SWITCH ASSEMBLY Remove the washer level sensor. (Scheme 21): Identifying Washer Level Sensor Connector Terminals Measure the resistance of the sensor. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 1 - 2 Washer jar is full Below 1 ohms 1 - 2 Washer jar is empty 10 kohms or higher NG: REPLACE LEVEL WARNING SWITCH ASSEMBLY OK: Go to next step
3. CHECK WIRE HARNESS (SENSOR - ECU AND BODY GROUND) Disconnect the W1 sensor connector. (Scheme 22): Identifying W1 Sensor Connector Terminals Remove the front light ECU. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition W1-1 - R/B front light ECU terminal 11 (WSLV) Below 1 ohms W1-2 - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

This circuit provides power to the combination switch.

Power Source - Wiring Diagram. Scheme 23

Scheme 24

1. CHECK WIRE HARNESS (SWITCH - BATTERY AND BODY GROUND) Disconnect the C11 switch connector. Measure the voltage of the wire harness side connector. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition C11-1 (B) - C11-8 (E) Always 10 to 14 V C11-2 (IG) - C11-8 (E) Ignition switch OFF Below 1 V C11-2 (IG) - C11-8 (E) Ignition switch ON 10 to 14 V Measure the resistance of the wire harness side connector. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition C11-8 (E) - Body ground Below 1 ohms (Scheme 24): Identifying C11 Switch Connector Terminals NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Identifying Front Wiper Motor And Link Components With Torque Specifications. Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
2. REMOVE FRONT WIPER ARM RH Stop the wiper at the automatic stop position. Remove the nut and arm.
3. REMOVE FRONT WIPER ARM LH Remove the nut and arm.
4. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY Detach the 5 claws and remove the 4 clips. (Scheme 26): Identifying Clips And Claws Detach the 8 claws and remove the louver. (Scheme 27): Identifying Louver And Claws
5. REMOVE WINDSHIELD WIPER LINK ASSEMBLY Disconnect the connector. Remove the 4 bolts and link. (Scheme 28): Locating Windshield Wiper Link Assembly Bolts And Link
6. REMOVE WINDSHIELD WIPER MOTOR ASSEMBLY Using a screwdriver, detach the connecting part of the rod at the crank arm pivot of the wiper motor. (Scheme 29): Detaching Connecting Part Of Rod At Crank Arm Pivot Remove the nut and washer. Place matchmarks on the crank arm and wiper motor. (Scheme 30): Identifying Matchmarks On Crank Arm And Wiper Motor Remove the 3 bolts and windshield wiper motor from the link. (Scheme 31): Locating Windshield Wiper Motor Bolts

Scheme 32

Scheme 33

1. INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY Check operation. Apply battery voltage to the wiper motor connector and check operation of the wiper motor. OK MEASUREMENT CONDITION SPECIFIED CONDITION CHART Measurement Condition Specified Condition Battery positive (+) --> Terminal 5 (+1) Battery negative (-) --> Terminal 4 (E) Wiper motor operation at low speed Battery positive (+) --> Terminal 3 (+2) Battery negative (-) --> Terminal 4 (E) Wiper motor operation at hi speed (Scheme 32): Identifying Windshield Wiper Motor Assembly Connector Terminals If the result is not as specified, replace the motor assembly. Check automatic stop operation. Connect the battery's positive (+) lead to terminal 5 (+1) and the negative (-) lead to terminal 4 (E), operate the motor at low speed and stop the motor operation anywhere except at the stop position by disconnecting the positive (+) lead. Using a service wire, connect terminals 5 (+1) and 1 (S). Connect the battery's positive (+) lead to terminal 2 (B). Check that the motor operates again and stops at the stop position. If the result is not as specified, replace the motor assembly. (Scheme 33): Checking Automatic Stop Operation

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

1. INSTALL WINDSHIELD WIPER MOTOR ASSEMBLY Apply MP grease to the crank arm pivot of the wiper motor. Install the wiper motor. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) (Scheme 34): Identifying Grease Applying Area Align the matchmarks on the crank arm and wiper motor. Install the washer and nut. Torque: 17.2 N*m (175 kgf*cm, 13 ft.*lbf) (Scheme 35): Aligning Matchmarks On Crank Arm And Wiper Motor
2. INSTALL WINDSHIELD WIPER LINK ASSEMBLY Install the link with the 4 bolts. Torque: 5.5 N*m (56 kgf*cm, 49 in.*lbf) Connect the connector. (Scheme 36): Locating Link With Bolts
3. INSTALL COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY Attach the 8 claws to install the louver. (Scheme 37): Identifying Louver And Claws Attach the 5 claws and install the 4 clips. (Scheme 38): Identifying Claws And Clips
4. INSTALL FRONT WIPER ARM LH Stop the wiper at the automatic stop position. Clean the wiper arm serration with a round file or equivalent. Clean the wiper pivot serration with a wire brush. (Scheme 39): Cleaning Wiper Pivot Serration Using Wire Brush Install the arm and blade with the nut. Make sure that the arm and blade comes to the position shown in the illustration. Torque: 22 N*m (220 kgf*cm, 16 ft.*lbf)
5. INSTALL FRONT WIPER ARM RH Stop the wiper at the automatic stop position. Scrape off the wiper arm serration with a round file or equivalent. Clean the wiper pivot serration with a wire brush. Install the arm and blade with the nut. Make sure that the arm and blade comes to the position shown in the illustration. (Scheme 40): Identifying Wipers Automatic Stop Position Torque: 22 N*m (220 kgf*cm, 16 ft.*lbf) Operate the wipers while spraying water or washer fluid on the windshield. Check the wiping condition and that the wiper does not hit against the vehicle body.
6. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
7. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION»(ref-283168-S15934672912008041900000) ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

Identifying Front Wiper Rubber Components. Scheme 41