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Home/Lexus/LX/Lexus LX J100 facelift (2002-2007)/Repair manual/Wiper/washer Systems/Rain Sensor System - Diagnosis
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Rain Sensor System - Diagnosis Lexus LX J100 facelift

Wiper/washer Systems 24 illustrations ~1560 words

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

This ECU is connected to the multiplex communication system. Therefore, be sure to check that there is no trouble in the multiplex communication system before performing the troubleshooting.

Scheme 1

Scheme 1: HOW TO PROCEED WITH TROUBLESHOOTING
Scheme 1: HOW TO PROCEED WITH TROUBLESHOOTING

Scheme 2

Scheme 2: CUSTOMER PROBLEM ANALYSIS CHECK
Scheme 2: CUSTOMER PROBLEM ANALYSIS CHECK

Scheme 3

Scheme 3: PRE-CHECK
Scheme 3: PRE-CHECK

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8
  1. DIAGNOSIS SYSTEM Description ECU data of this system can be read from DLC3 of the vehicle. Therefore, when there seems to be a trouble on this system, use hand-held tester to check and troubleshoot it. Check the DLC3. The vehicle's ECM uses ISO 9141 -2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. HINT: If your display shows "UNABLE TO CONNECT TO VEHICLE" when the cable of the hand- held tester is connected to DLC3, the ignition switch is turned ON and the hand- held tester is operated, there is a problem either on the vehicle side or tool side. If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle. If communication does not function when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.
  2. DATA LIST HINT: By the DATA LIST displayed on the Hand-held tester, you can read the value of the switch, sensor, actuator and so on without removing parts. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time. Turn the ignition switch OFF. Connect the hand-held tester to DLC3. Turn the ignition switch ON. According to the display on tester, read the "DATA LIST". Rain Sensor Wiper Control ECU
  3. ACTIVE TEST HINT: Performing ACTIVE TEST using the Hand-held tester allows the relay, and so on to operate without removing any parts. Performing the ACTIVE TEST as a first step of troubleshooting is one of the method to shorten the labor time. DATA LIST can be displayed during the ACTIVE TEST. Turn the ignition switch OFF. Connect the Hand-held tester to the DLC3. Turn the ignition switch ON. According to the display on tester, perform the "ACTIVE TEST". Wiper Control ECU

Scheme 9

Scheme 9: PARTS LOCATION
Scheme 9: PARTS LOCATION

Scheme 10

Scheme 10: WIPER CONTROL ECU
Scheme 10: WIPER CONTROL ECU

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Scheme 11
Scheme 11

Scheme 12

Scheme 12: RAIN SENSOR
Scheme 12: RAIN SENSOR

Scheme 13

Scheme 13
Scheme 13

Scheme 14

Scheme 14: PROBLEM SYMPTOMS TABLE
Scheme 14: PROBLEM SYMPTOMS TABLE

CIRCUIT DESCRIPTION

This circuit provides power to operate the rain sensor.

The auto wiper system is operated the wiper switch being in the auto position.

The rain sensor is connected to each ECU at the multiplex communication circuit.

When it detects raindrops that are stuck to the detection area of the windshield glass, it sends the wiper control signal according to the amount of raindrops to the Wiper Control ECU.

Scheme 15

Scheme 15: WIRING DIAGRAM
Scheme 15: WIRING DIAGRAM

INSPECTION PROCEDURE

  1. Check ECU-IG2 fuse. CHECK: Check continuity of ECU-IG2 fuse. OK: Continuity NG: Replace the defective fuse. OK: Go to next step.
  2. Check voltage between terminal SIG and ES of rain sensor. PREPARATION: Turn ignition switch ON. CHECK: Measure voltage between terminals SIG and ES of rain sensor with connector being connected. OK: Voltage: 10-14V OK: Proceed to next circuit inspection shown on problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) ). NG: Go to next step.
  3. Check wire harness and connector between rain sensor and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness or connector. OK: Check and repair wire harness and connector between ECU and battery.

This circuit provides power to operate the Wiper Control ECU.

This circuit is the power source for the BEAN drive circuit.

Scheme 16

Scheme 16: WIRING DIAGRAM
Scheme 16: WIRING DIAGRAM
  1. Check ECU-B2 fuse. CHECK: Check continuity of ECU-B2 fuse. OK: Continuity NG: Replace the defective fuse. OK: Go to next step.
  2. Check voltage between terminal +B and GND of Wiper Control ECU. CHECK: Measure voltage between terminals +B and GND of Wiper Control ECU with connector being connected. OK: Voltage: 10-14 V OK: Proceed to next circuit inspection shown on problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) ). NG: Go to next step.
  3. Check wire harness and connector between Wiper Control ECU and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness or connector. OK: Check and repair wire harness and connector between ECU and battery.

This circuit is the power source for the wiper motor, the surrounding circuits, the CPU circuits and the input signal pull-up.

Scheme 17

Scheme 17: WIRING DIAGRAM
Scheme 17: WIRING DIAGRAM

Scheme 18

Scheme 18: INSPECTION PROCEDURE
Scheme 18: INSPECTION PROCEDURE
  1. Check WIPER and AM1 fuse. CHECK: Check continuity of AM1 fuse. OK: Continuity NG: Check for short in all the harness and components connected to WIPER and AM1 fuse. NG: Go to next step.
  2. Check voltage between terminal WIG of Wiper Control ECU connector and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). PREPARATION: Remove wiper control ECU with connectors being connected. CHECK: Measure voltage between terminal IG of wiper control ECU connector and body ground when ignition switch is ON and OFF. OK: Voltage: OK: Proceed to next circuit inspection shown on problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) ). NG: Check and repair harness or connector between Wiper Control ECU and battery.

This signal is taken into Body ECU (Sub). If this signal cannot be received, Body ECU (Main), (Sub) does not perform reverse linked function control.

Scheme 19

Scheme 19: WIRING DIAGRAM
Scheme 19: WIRING DIAGRAM
  1. Check wire harness between wiper control ECU and front wiper motor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness. OK: Go to next step.
  2. Check wire harness between wiper control ECU and body ECU (Sub) (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness. OK: Proceed to next circuit inspection shown on problem symptom table (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) ).

This circuit sends a signal of the Park/Neutral Position switch (Neutral or other) to the wiper control ECU.

HINT

Refer to the (See AUTOMATIC TRANSMISSION ).

Scheme 20

Scheme 20: WIRING DIAGRAM
Scheme 20: WIRING DIAGRAM
  1. Check PNP signals using hand-held tester. PREPARATION: Connect the hand-held tester to DLC3. Connect the hand-held tester to DLC3. Turn the ignition switch ON and push the hand-held tester main SW ON. CHECK: Select the item "NSW SW" in the DATA LIST and read its valve displayed. OK: PNP switch position N: ON PNP switch position except N: OFF OK: Proceed to next circuit inspection shown on problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) ). NG: Repair or replace harness and connector between park/neutral position switch and wiper control ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

This circuit sends a stop light switch ON or OFF signal to ECU.

Scheme 21

Scheme 21: WIRING DIAGRAM
Scheme 21: WIRING DIAGRAM
  1. Check stop light switch (See «INSPECTION»(/lexus/lx/j100-facelift-2002-2007/remont/exterior-lights/#stop-light-system) ). NG: Replace stop light switch. OK: Go to next step.
  2. Check wire harness between stop light switch and wiper control ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness. OK: Proceed next circuit inspection shown on problem symptom table. (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) )

This circuit sends a front washer switch ON or OFF signal to ECU.

Scheme 22

Scheme 22: WIRING DIAGRAM
Scheme 22: WIRING DIAGRAM
  1. Check WASHER fuse. CHECK: Check continuity of WASHER fuse. OK: Continuity NG: Replace WASHER fuse. OK: Go to next step.
  2. Check wire harness between combination switch and wiper control ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or Replace wire harness. OK: Proceed to next circuit inspection shown on problem symptom table. (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) )

This circuit detects the state of the wiper switch and send it to the Wiper Control ECU.

Scheme 23

Scheme 23: WIRING DIAGRAM
Scheme 23: WIRING DIAGRAM
  1. Check wire harness between combination switch and Wiper Control ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness. OK: Go to next step.
  2. Check wire harness between combination switch and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness. OK: Proceed to next circuit inspection shown on problem symptom table. (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) )

The Wiper Control ECU controls the front wiper motor.

Scheme 24

Scheme 24: WIRING DIAGRAM
Scheme 24: WIRING DIAGRAM

HINT

in case of using the hand-held tester, start the inspection from step 1 and in case of not using the hand-held tester, start from step 2.

  1. Check the wiper motor using hand-held tester. PREPARATION: Connect the hand-held tester to DLC3. CHECK: Check that the wiper motor can operate in an ACTIVE TEST. HINT: LOW and HIGH can be checked at the test separately. Therefore, check a HIGH side at the time of the problem that HIGH does not operate properly and LOW side at the time of the problem that LOW does not operate properly. OK: Proceed to next circuit inspection shown on problem symptom table (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) ). NG: Go to next step.
  2. Check WIPER fuse. CHECK: Check continuity of WIPER fuse. OK: Continuity NG: Replace WIPER fuse. OK: Go to next step.
  3. Check the wiper motor (See «INSPECTION»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#wiper-washer-system) ). NG: Replace the wiper motor. OK: Go to next step.
  4. Check wire harness and connector between wiper motor and Wiper Control ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace wire harness or connector. OK: Proceed next circuit inspection shown on problem symptom table. (See «PROBLEM SYMPTOMS TABLE»(/lexus/lx/j100-facelift-2002-2007/remont/wiperwasher-systems/#rain-sensor-system-diagnosis) )