DTC B1077: Windshield Wiper Motor (Park) Signal Error
| DTC Description | DTC |
|---|---|
| B1077 Windshield Wiper Motor (Park) Signal Error |
NOTE: Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .
- 1. Determine possible failure area (windshield wiper motor and its drive circuit, FR WIPER AS line):
1. Clear the DTCs with the HDS.
2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
3. Turn the windshield wiper switch to LOW or HIGH for 15 seconds or more, then turn the switch OFF.
Does the wiper motor work?
YES
Go to step 2.
NO
Go to step 5.
- 2. Problem verification (DTC):
1. Check for DTCs with the HDS.
DTC Description DTC B1077 Windshield Wiper Motor (Park) Signal Error Is DTC B1077 indicated?
YES
Go to step 3.
NO
Intermittent failure, the system is OK at this time.
- 3. Windshield wiper motor check (AS signal):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Do the windshield wiper motor test .
Does the wiper motor run and does it pulse normally?
YES
Go to step 4.
NO
- 4. Open or shorted wire check (FR WIPER AS line):
1. Disconnect the following connectors.
Windshield wiper motor 4P connector Under-dash fuse/relay box connector C (38P) 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Windshield wiper motor 4P connector: disconnected
Under-dash fuse/relay box connector C (38P): disconnected
Test point 1 Under-dash fuse/relay box connector C (38P) No. 23 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire.
NO
Repair an open or high resistance in the wire.
- 5. Fuse check:
1. Turn the vehicle to the OFF (LOCK) mode.
2. Check the following fuses.
Fuse No. A2-9 (30 A) Location Under-hood fuse/relay box Is each fuse OK?
YES
Go to step 6.
NO
Replace the fuse. If the fuse blows again, repair the short to ground in the No. A2-9 (30 A) and/or No. No. B13 (15 A) fuse circuit(s).
- 6. Open wire check (+B FR WIPER MAIN line):
1. Disconnect the following connectors.
Relay circuit board connector A (16P) Relay circuit board connector B (10P) 2. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Test point 1 Relay circuit board connector A (16P) No. 16 Test point 2 Body ground Is there battery voltage?
YES
The +B FR WIPER MAIN wire is OK. Go to step 7.
NO
Repair an open or high resistance in the wire.
- 7. Open wire check (IG1 WIPER&WASHER line):
1. Turn the vehicle to the ON mode.
2. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Test point 1 Relay circuit board connector A (16P) No. 9 Test point 2 Body ground Is there battery voltage?
YES
IG1 WIPER&WASHER wire is OK. Go to step 8.
NO
Repair an open or high resistance in the wire.
- 8. Open wire check (GND line):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Test point 1 Relay circuit board connector B (10P) No. 1 Test point 2 Body ground Is there continuity?
YES
GND wire is OK. Go to step 9.
NO
Repair an open or high resistance in the ground wire or poor ground (G302).
- 9. Relay circuit board check:
1. Test the relay circuit board .
Is the relay circuit board OK?
YES
Go to step 10.
NO
Replace the relay circuit board.
- 10. Open wire check (FR WIPER INT RLY CL- line):
1. Disconnect the following connectors.
Under-dash fuse/relay box connector C (38P) 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Under-dash fuse/relay box connector C (38P): disconnected
Test point 1 Relay circuit board connector A (16P) No. 6 Test point 2 Under-dash fuse/relay box connector C (38P) No. 22 Is there continuity?
YES
The FR WIPER INT RLY CL- wire is OK. Go to step 11.
NO
Repair an open or high resistance in the wire.
- 11. Open wire check (FR WIPER HI/LO RLY COM line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Under-dash fuse/relay box connector C (38P): disconnected
Test point 1 Relay circuit board connector A (16P) No. 3 Test point 2 Under-dash fuse/relay box connector C (38P) No. 32 Is there continuity?
YES
The FR WIPER HI/LO RLY COM wire is OK. Go to step 12.
NO
Repair an open or high resistance in the wire.
- 12. Open wire check (FR WIPER HI line):
1. Disconnect the following connector.
Windshield wiper motor 4P connector 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Under-dash fuse/relay box connector C (38P): disconnected
Windshield wiper motor 4P connector: disconnected
Test point 1 Relay circuit board connector A (16P) No. 12 Test point 2 Windshield wiper motor 4P connector No. 3 Is there continuity?
YES
The FR WIPER HI wire is OK. Go to step 13.
NO
Repair an open or high resistance in the wire.
- 13. Open wire check (FR WIPER LO line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Relay circuit board connector A (16P): disconnected
Relay circuit board connector B (10P): disconnected
Under-dash fuse/relay box connector C (38P): disconnected
Windshield wiper motor 4P connector: disconnected
Test point 1 Relay circuit board connector A (16P) No. 13 Test point 2 Windshield wiper motor 4P connector No. 1 Is there continuity?
YES
The FR WIPER LO wire is OK. Go to step 14.
NO
Repair an open or high resistance in the wire.
- 14. Windshield wiper motor check:
1. Do the windshield wiper motor test .
Does the wiper motor run and does it pulse normally?
YES
Faulty MICU; replace the under-dash fuse/relay box .
NO
