Lexus ES: Lost Communication with Wiper System LIN BUS (B1373)
DESCRIPTION
The main body ECU (multiplex network body ECU) and windshield wiper motor assembly communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | DTC Output from |
|---|---|---|---|---|---|
| B1373 | Lost Communication with Wiper System LIN BUS |
|
| ○ | Main Body |
- *: w/ Auto Wiper System
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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PROCEDURE
| 1. | CONFIRM MODEL |
(a) Choose the model to be inspected.
| Result | Proceed to |
|---|---|
| w/o Auto Wiper System | A |
| w/ Auto Wiper System | B |
| B | .gif) | GO TO STEP 4 |
|
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| 2. | CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - WINDSHIELD WIPER MOTOR ASSEMBLY) |
(a) Disconnect the G36 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the A38 windshield wiper motor assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G36-3 (LIN3) or A38-2 (LIN) - Body ground | Always | 10 kΩ Higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK MAIN BODY ECU |
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| *a | Component without harness connected (Main Body ECU (Multiplex Network Body ECU) |
(a) Check for voltage and pulses according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G36-3 (LIN3) - Body ground | Power switch off | Below 1 V |
| Power switch on (IG) | Pulse generation |
| OK | | REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 4. | CHECK RAIN SENSOR |
(a) Disconnect the P2 rain sensor connector.
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs(c) Turn the power switch on (IG) and wait for at least 10 seconds.
(d) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| Only DTC B1279 is output | A |
| DTC B1373 is output | B |
| A | | REPLACE RAIN SENSOR |
|
| 5. | CHECK WINDSHIELD WIPER MOTOR ASSEMBLY |
(a) Disconnect the A38 windshield wiper motor assembly connector.
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs(c) Turn the power switch on (IG) and wait for at least 10 seconds.
(d) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| Only DTC B1245 is output | A |
| DTC B1373 is output | B |
| A | | REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY |
|
| 6. | CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - WINDSHIELD WIPER MOTOR ASSEMBLY AND RAIN SENSOR) |
(a) Disconnect the G36 main body ECU (multiplex network body ECU) connector.
(b) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs(c) Turn the power switch on (IG) and wait for at least 10 seconds.
(d) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| DTC B1373 is not output | A |
| DTC B1373 is output | B |
| A | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| B | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
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