DTC Troubleshooting: U0199
DTC U0199: Lost Communication With Door Multiplex Control Unit (DRLockSW Frame)
DTC Description
DTC
U0199 Lost Communication With Door Multiplex Control Unit (DRLockSW frame)
  

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Press the engine start/stop button to select the OFF mode and then the ON mode.

?3.
Wait for at least 6 seconds.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
U0199 Lost Communication With Door Multiplex Control Unit (DRLockSW frame)
  

Is DTC U0199 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Determine possible failure area (door multiplex control unit power and ground, B CAN line):

Determine possible failure area (door multiplex control unit power and ground, B CAN line)
?1.
Select B-CAN CONTROL UNITS INFORMATION from the BODY ELECTRICAL SYSTEM SELECT menu, and then select CHECK CONNECTED CONTROL UNITS.

?2.
Check the DETECT/NOT AVAILABLE information of the POWER WINDOW UNIT.

Is DETECT indicated?

     
YES
     
     
     
Go to step 8.
     
NO
     
     
     
Go to step 3.
3.
Fuse check:

Fuse check
?1.
Check the following fuses.
Fuse
No. A21 (10 A)
Location
Under-hood fuse/relay box

Fuse
No. B1 (7.5 A)
Location
Under-dash fuse/relay box

Is each fuse OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair a short to ground in the No. A21 (10 A) and/or B1 (7.5 A) fuse circuit(s).?
4.
Open wire check (+B BACK UP line):

Open wire check (+B BACK UP line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
Power window master switch 37P connector: disconnected
Test circuit
+B BACK UP
Test point 1
Power window master switch 37P connector No. 26 (WHT)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The +B BACK UP wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
5.
Open wire check (IG2 A/C line):

Open wire check (IG2 A/C line)
?1.
Press the engine start/stop button to select the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
ON mode
Power window master switch 37P connector: disconnected
Test circuit
IG2 A/C
Test point 1
Power window master switch 37P connector No. 25 (LT GRN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG2 A/C wire is OK. Go to step 6.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
6.
Open wire check (GND lines):

Open wire check (GND lines)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Check for continuity between test points 1 and 2 individually.
Test condition
OFF mode
Power window master switch 37P connector: disconnected
Test circuit
GND
Test point 1
Power window master switch 37P connector No. 3 (BLK)
Test point 2
Body ground

Test circuit
GND
Test point 1
Power window master switch 37P connector No. 31 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wires are OK. Go to step 7.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G501).?
7.
Open wire check (B CAN/CAN lines):

Open wire check (B CAN/CAN lines)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Power window master switch 37P connector: disconnected
Power seat control unit connector B (20P): disconnected
Test circuit
B CAN-H/CAN-H
Test point 1
Power window master switch 37P connector No. 28 (PNK)
Test point 2
Power seat control unit connector B (20P) No. 16 (LT BLU)


Is there continuity?

     
YES
     
     
     
An open or poor connection in the B CAN-L/CAN-L wire between the power window master switch and the climate control unit.?
     
NO
     
     
     
An open or poor connection in the B CAN-H/CAN-H wire between the power window master switch and the power seat control unit.?
8.
Open wire check (B CAN/CAN lines):

Open wire check (B CAN/CAN lines)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connectors.

?3.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Power window master switch 37P connector: disconnected
Power seat control unit connector B (20P): disconnected
Test circuit
B CAN-H/CAN-H
Test point 1
Power window master switch 37P connector No. 28 (PNK)
Test point 2
Power seat control unit connector B (20P) No. 16 (LT BLU)


Is there continuity?

     
YES
     
     
     
An open or poor connection in the B CAN-L/CAN-L wire between the power window master switch and the power seat control unit.?
     
NO
     
     
     
An open or poor connection in the B CAN-H/CAN-H wire between the power window master switch and the power seat control unit.?