Home ReviewsRefund
Home/Lexus/RX/Lexus RX III (2008-2012)/Repair manual/Wiper/washer Systems/Wiper / Washer (Diagnostics): Other
Contents Wiring diagrams Section: Wiper/washer Systems All sections

Wiper / Washer (Diagnostics): Other Lexus RX III

Wiper/washer Systems 5 illustrations ~2866 words

PRECAUTION

Note. When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Parking Assist Monitor System Refer to INITIALIZATION Side Monitor System (w/ Parking Assist Monitor System) Back Door Closer System Power Back Door System

  1. PRECAUTION OF WASHER NOZZLE ADJUSTMENT Do not clean or adjust the washer nozzle with a safety pin, etc. because: the washer nozzle tip is made of resin and could be damaged. adjustment is not necessary for this spray type washer nozzle. If it is necessary to change the nozzle angle, replace the washer nozzle with one that has a different nozzle angle. If the washer nozzle is clogged with wax, etc., remove it and clean the nozzle hole with a soft resin brush or other cleaning tool.

Note. When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Parking Assist Monitor System Refer to INITIALIZATION Side Monitor System (w/ Parking Assist Monitor System) Back Door Closer System Power Back Door System

  1. PRECAUTION OF WASHER NOZZLE ADJUSTMENT Do not clean or adjust the washer nozzle with a safety pin, etc. because: the washer nozzle tip is made of resin and could be damaged. adjustment is not necessary for this spray type washer nozzle. If it is necessary to change the nozzle angle, replace the washer nozzle with one that has a different nozzle angle. If the washer nozzle is clogged with wax, etc., remove it and clean the nozzle hole with a soft resin brush or other cleaning tool.

Scheme 159

Scheme 159: ILLUSTRATION
Scheme 159: ILLUSTRATION

Scheme 160

Scheme 160: ILLUSTRATION
Scheme 160: ILLUSTRATION

Scheme 161

Scheme 161: SYSTEM DIAGRAM
Scheme 161: SYSTEM DIAGRAM

Scheme 162

Scheme 162
Scheme 162

Scheme 163

Scheme 163
Scheme 163
  1. FRONT WIPER AND WASHER (w/ Auto Wiper System)
  2. FRONT WIPER AND WASHER (w/o Auto Wiper System)
  3. HEADLIGHT CLEANER SYSTEM

FAIL-SAFE CHART

  1. FRONT WIPER SYSTEM The following measures are taken as fail-safe when any malfunction is detected by the windshield wiper relay. Trouble Area Fail-safe Control Wiper Motor The operation of the rain sensing function stops. Communication Signal Rain sensing function: The wiper operation continues at the speed that it was operating at prior to the malfunction. Switches to the intermittent operation if a malfunction of the rain sensor is detected when the power source is switched from IG-OFF to IG-ON or the wiper switch is in AUTO position. Wiper switch operation: The wiper operation continues at the speed that it was operating at prior to the malfunction.

PROCEDURE

  1. CHECK OPERATION Check the operation of the front wiper and washer system. OK Front wiper and washer system operates normally. NG --> See step 4 OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - RELAY) Disconnect the A33 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A33-5 (FRWA) - Body ground Front washer switch off 11 to 14 V Front washer switch on Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  4. GO TO PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  1. CHECK HARNESS AND CONNECTOR (LOW BEAM HEADLIGHT RELAY - ECU) Disconnect the A33 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A33-1 (HDLO) - Body ground Light control switch in head position 11 to 14 V Light control switch off Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  1. INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY Remove the windshield wiper motor assembly. Refer to «REMOVAL»(ref-400809-S41356394852011051800000) . Check LO operation. Connect a battery positive (+) lead to terminal 1 (+1) and a negative (-) lead to terminal 5 (E), and check that the motor operates at low speed (LO). OK Motor operates at low speed (LO). Check HI operation. Connect a battery positive (+) lead to terminal 4 (+2) and a negative (-) lead to terminal 5 (E), and check that the motor operates at high speed (HI). OK Motor operates at high speed (HI). TEXT IN ILLUSTRATION *1 Component without harness connected (Windshield Wiper Motor Assembly) NG --> See step 5 OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BATTERY AND BODY GROUND) Disconnect the A34 windshield wiper motor connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A34-2 (B) - Body ground Engine switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A34-5 (E) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Motor Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR - WINDSHIELD WIPER SWITCH) Disconnect the F42 windshield wiper switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F42-8 (+1) - A34-1 (+1) Always Below 1 ohms A34-1 (+1) - Body ground Always 10 kohms or higher F42-9 (+2) - A34-4 (+2) Always Below 1 ohms A34-4 (+2) - Body ground Always 10 kohms or higher F42-18 (+S) - A34-3 (+S) Always Below 1 ohms A34-3 (+S) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Motor Assembly) *2 Front view of wire harness connector (to Windshield Wiper Switch Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  5. REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY. Refer to «REMOVAL»(ref-400809-S41356394852011051800000)
  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Disconnect the T3 rain sensor connector. Measure the voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition T3-4 (SIG) - T3-1 (ES) Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Rain Sensor) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (RAIN SENSOR - WINDSHIELD WIPER SWITCH ASSEMBLY) Disconnect the F42 windshield wiper switch assembly connector. Disconnect the T3 rain sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F42-5 (MPX1) - T3-3 (MPX) Always Below 1 ohms T3-3 (MPX) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Switch Assembly) *2 Front view of wire harness connector (to Rain Sensor) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. INSPECT RAIN SENSOR Reconnect the rain sensor connector. Connect an oscilloscope to the automatic light control sensor connector. Check for pulses. OK Tester Connection Condition Specified Condition T3-3 (MPX) - T3-1 (ES) Engine switch on (IG) Pulse generation TEXT IN ILLUSTRATION *1 Component without harness connected (Rain Sensor) NG --> See step 5 OK --> See step 4
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  5. REPLACE RAIN SENSOR. Refer to «REMOVAL»(ref-400809-S39635511412011051800000)
  1. INSPECT HEADLIGHT CLEANER CONTROL RELAY (H SIGNAL) Disconnect the A33 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A33-2 (H) - Body ground Light control switch in head and headlight cleaner switch on 11 to 14 V A33-2 (H) - Body ground Headlight cleaner switch off Below 1 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> See step 2 OK --> See step 3
  2. INSPECT HEADLIGHT CLEANER SWITCH ASSEMBLY Remove the headlight cleaner switch assembly. Refer to «REMOVAL (TO 8/2009)»(ref-400809-S34468214912011051800000) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 2 (L) - 3 (B) Headlight cleaner switch off 10 kohms or higher 2 (L) - 3 (B) Headlight cleaner switch on Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Headlight Cleaner Switch Assembly) NG --> See step 4 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - HEADLIGHT CLEANER CONTROL RELAY)
  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  4. REPLACE HEADLIGHT CLEANER SWITCH ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»(ref-400809-S34468214912011051800000)
  1. INSPECT HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY HINT: The following check should be performed with the headlight cleaner motor and pump assembly installed to the washer jar. Fill the washer jar with washer fluid. Connect a battery positive (+) lead to terminal 1 of the headlight cleaner motor and pump assembly, and a battery negative (-) lead to terminal 2. Check that washer fluid flows from the washer jar. OK Washer fluid is pumped from the washer jar. TEXT IN ILLUSTRATION *1 Component without harness connected (Headlight Cleaner Motor and Pump Assembly) NG --> See step 4 OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER MOTOR CIRCUIT) Connect the headlight cleaner motor and pump assembly connector. Disconnect the A33 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A33-6 (PB) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BATTERY) OK --> See step 3
  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  4. REPLACE HEADLIGHT CLEANER MOTOR AND PUMP ASSEMBLY. Refer to «REMOVAL»(ref-400809-S28286931522011051800000)
  1. INSPECT WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY HINT: The following check should be performed with the windshield washer motor and pump assembly installed to the washer jar. Fill the washer jar with washer fluid. Connect a battery positive (+) lead to terminal 1 of the washer motor, and a battery negative (-) lead to terminal 2. Check that washer fluid flows from the washer jar. OK Washer fluid is pumped from the washer jar. TEXT IN ILLUSTRATION *1 Component without harness connected (Windshield Washer Motor and Pump Assembly) NG --> See step 5 OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY - BATTERY) Disconnect the A40 windshield washer motor and pump assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A40-1 - Body ground Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Washer Motor and Pump Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HARNESS OR CONNECTOR (WIPER SWITCH - WINDSHIELD WIPER MOTOR AND PUMP ASSEMBLY) Disconnect the F42 windshield wiper switch assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A40-2 - F42-2 (WF) Always Below 1 ohms A40-2 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Switch Assembly) *2 Front view of wire harness connector (to Windshield Washer Motor and Pump Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  5. REPLACE WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»(ref-400809-S25551016682011051800000)
  1. INSPECT LEVEL WARNING SWITCH ASSEMBLY HINT: The following check should be performed with the windshield washer motor and pump installed to the washer jar. Fill the washer jar with washer fluid. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (S) - 2 (E) Fluid volume is more than 600 to 800 ml 10 kohms or higher 1 (S) - 2 (E) Fluid volume is less than 600 to 800 ml Below 1 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Level Warning Switch Assembly) NG --> See step 4 OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (LEVEL WARNING SWITCH - COMBINATION METER AND BODY GROUND) Disconnect the F15 combination meter connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F15-7 (WLVL) - A41-1 (S) Always Below 1 ohms A41-2 (E) - Body ground Always Below 1 ohms F15-7 (WLVL) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Level Warning Switch Assembly) *2 Front view of wire harness connector (to Combination Meter Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 3
  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  4. REPLACE LEVEL WARNING SWITCH ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»(ref-400809-S14862338562011051800000)
  1. CHECK COMBINATION METER SYSTEM The circuit that sends vehicle speed signals to the combination meter system is inspected in the meter article. Refer to «Speed Signal Circuit»(ref-400803-S27595521952011051800000) . NEXT: Go to next step
  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - COMBINATION METER) Disconnect the F42 windshield wiper switch assembly connector and F15 combination meter connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F42-6 (SPD) - F15-3 (+S) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Switch Assembly) *2 Front view of wire harness connector (to Combination Meter Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. INSPECT COMBINATION METER ASSEMBLY (SPEED SENSOR SIGNAL) Check the output waveform. Remove the combination meter assembly with the connector still connected. Connect an oscilloscope to terminal F15-3 (+S) and body ground. Turn the engine switch on (IG). Turn a wheel slowly. Check the signal waveform according to the condition(s) in the table below. Item Condition Tool setting 5 V/DIV., 20 ms./DIV. Vehicle condition Driving at approx. 20 km/h (12 mph) OK The waveform is displayed as shown in the illustration. HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. TEXT IN ILLUSTRATION *1 Component with harness connected (Combination Meter) NG --> See step 5 OK --> See step 4
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  5. REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL (TO 8/2009)»(ref-400807-S03467652992011051800000)
  1. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - BATTERY AND BODY GROUND) w/ Auto Wiper System: Disconnect the F42 windshield wiper switch assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F42-3 (WIG) - Body ground Engine switch on (IG) 11 to 14 V F42-17 (+B) - Body ground Engine switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F42-1 (EW) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Switch Assembly) w/o Auto Wiper System: Disconnect the F42 windshield wiper switch assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F42-17 (+B) - Body ground Engine switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition F42-1 (EW) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Windshield Wiper Switch Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)
  1. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - BATTERY AND BODY GROUND) Disconnect the A33 headlight cleaner control relay connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A33-3 (IG) - Body ground Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A33-4 (E) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Headlight Cleaner Control Relay) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
  2. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400840-S37005256712011051800000)

More articles — Wiper / Washer (Diagnostics)