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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