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 |
- Battery voltage is 9.5 V or more
- Communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper motor assembly
|
- Windshield wiper motor assembly
- Main body ECU (multiplex network body ECU)
- WIPER relay
- Harness or connector
| ○ |
Main body ECU (multiplex network body ECU) | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE: Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here  PROCEDURE
(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 |
 | GO TO B1373 |
|
A |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the A26 windshield wiper motor assembly connector. (b) Disconnect the G32 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G32-3 (LIN3) - A26-2 (LIN) |
Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 3. |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
*a | Component without harness connected
(Main Body ECU (Multiplex Network Body ECU) |
(a) Check for pulses according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G32-3 (LIN3) - Body ground |
Engine switch off | Below 1 V | |
Engine switch on (IG) |
Pulse generation |
| NG |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
OK | |
| |
| 4. |
PERFORM ACTIVE TEST USING TECHSTREAM | (a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Enter following menus: Body Electrical / Main Body / Active Test. (e) Perform the Active Test according to the display on the Techstream. Body Electrical > Main Body > Active Test
|
Tester Display | Measurement Item |
Control Range | Diagnostic Note | |
Wiper Power Relay | Function to operate the WIPER relay |
OFF or ON | - | Body Electrical > Main Body > Active Test
|
Tester Display | | Wiper Power Relay |
OK: WIPER relay operates normally.
| NG |
| GO TO STEP 10 |
|
OK | |
| |
| 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 | |
A26-1 (GND) - Body ground |
Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 6. |
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 | |
A26-4 (+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 or more after engine switch turned off |
Below 1 V |
| OK |
| REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY |
|
NG | |
| |
(a) Inspect the WIPER relay.
Click here
| NG |
| REPLACE WIPER RELAY |
|
OK | |
| |
| 8. |
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 |
|
OK | |
| |
| 9. |
CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - WIPER RELAY) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A26-4 (+B) - 5 (WIPER relay) |
Always | Below 1 Ω | |
A26-4 (+B) or 5 (WIPER relay) - Body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
(a) Inspect the WIPER relay.
Click here
| NG |
| REPLACE WIPER RELAY |
|
OK | |
| |
| 11. |
CHECK HARNESS AND CONNECTOR (WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the G33 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) - G33-21 (WPS) |
Always | Below 1 Ω | |
1 (WIPER relay) or G33-21 (WPS) - Body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 12. |
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 |
| OK |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
