Lexus ES: Wiper Motor Power Source Circuit
DESCRIPTION
This circuit is the power source circuit for the windshield wiper motor assembly.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses of circuits related to this system before performing the following procedure.
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Wiper / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Wiper > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Motor Power Supply Voltage | Front wiper motor assembly supply voltage status | Min.: 0 V Max.: 63 V | Almost the same as actual windshield wiper motor assembly voltage | - |
| Tester Display |
|---|
| Motor Power Supply Voltage |
OK:
The Techstream display is normal.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. | CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND) |
(a) Disconnect the A38 windshield wiper motor assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A38-1 (GND) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER MOTOR ASSEMBLY) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A38-4 (+B) - Body ground | Power switch on (IG) | 11 to 14 V |
| Less than approximately 60 seconds after power switch turned off | 11 to 14 V | |
| Approximately 60 seconds after power switch turned off | Below 1 V |
| OK | | REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY |
|
| 4. | INSPECT WIPER RELAY |
(a) Inspect the WIPER relay.
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| NG | | REPLACE WIPER RELAY |
|
| 5. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - WIPER RELAY) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 3 (WIPER relay) - Body ground | Always | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2 (WIPER relay) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | CHECK HARNESS AND CONNECTOR (WIPER RELAY - WINDSHIELD WIPER MOTOR ASSEMBLY) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 5 (WIPER relay) - A38-4 (+B) | Always | Below 1 Ω |
| 5 (WIPER relay) or A38-4 (+B) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 8. | CHECK HARNESS AND CONNECTOR (WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the G37 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 1 (WIPER relay) - G37-21 (WPS) | Always | Below 1 Ω |
| 1 (WIPER relay) or G37-21 (WPS) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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SEE MORE:
Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS NOTICE:
If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
The Operation History fun
Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during rear crankshaft oil seal removal/installation are shown below. Necessary Procedure After Parts Removed/
