Lexus ES: Lost Communication with Wiper ECU LIN (B1245)
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 |
|---|---|---|---|---|---|
| B1245 | Lost Communication with Wiper ECU LIN |
|
| ○ | Main Body |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here .gif)
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes| Result | Proceed to |
|---|---|
| Only DTC B1245 is output | A |
| DTC B1245 and B1373 are output | B |
| B | .gif) | GO TO B1373 |
|
.gif)
| 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) - A38-2 (LIN) | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| *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 | Engine switch off | Below 1 V |
| Engine switch on (IG) | Pulse generation |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
| 4. | 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 | Engine switch on (IG) | 11 to 14 V |
| Less than approximately 60 seconds after engine switch turned off | 11 to 14 V | |
| Approximately 60 seconds after engine switch turned off | Below 1 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND) |
(a) 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 |
| OK | | REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Lost Communication with Humidity/Rain Sensor LIN (B1279)
DESCRIPTION The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes ab
ECU Malfunction (B1370)
DESCRIPTION This DTC is stored when the windshield wiper motor assembly detects an internal malfunction. DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from
Wiper Switch Signal Mismatch between LIN and Line (B1372)
DESCRIPTION Under normal operation, the windshield wiper motor assembly receives operation signals from the windshield wiper switch assembly via LIN communication. The windshield wiper motor assembly
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY (a) Turn the roller by hand to check that it turns smoothly. HINT: If the roller does not turn smoothly, replace the No. 1 valve rocker arm sub-assembly. 2. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOTICE:
Keep the val
Remote Touch
Remote Touch
The Remote Touch can be used to
operate the Center Display.
For details on the Remote touch,
refer to the "NAVIGATION AND
MULTIMEDIA SYSTEM
OWNER'S MANUAL".
Remote Touch operation
■ Switches
8-inch display model
"HOME" button
Press this button to display the home
