DTC U0199: Keyless Access - P/W Communication Error

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. Problem verification:

  1. Clear the DTCs with the HDS.

  2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

  3. Wait for at least 6 seconds.

  4. Check for DTCs with the HDS.

  DTC Description	DTC
  U0199 Keyless access - P/W COMMUNICATION ERROR

  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 (power window master switch 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:

  1. Check the following fuses.

  Fuse	No. A29 (10 A)
  Location	Under-hood fuse/relay box

  Fuse	No. B22 (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. A29 (10 A) and/or No. B22 (7.5 A) fuse circuit(s).

• 4. Open wire check (+B BACK UP line):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connector.

  Power window master switch 37P connector

  3. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode Power window master switch 37P connector: disconnected
  Test point 1	Power window master switch 37P connector No. 26 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  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):

  1. Turn the vehicle to the ON mode.

  2. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode Power window master switch 37P connector: disconnected
  Test point 1	Power window master switch 37P connector No. 25 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  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):

  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 Power window master switch 37P connector: disconnected
  Test circuit 1
  Test point 1	Power window master switch 37P connector No. 3 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  Test point 2	Body ground

  Test circuit 2
  Test point 1	Power window master switch 37P connector No. 31 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  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 lines):

  1. Disconnect the following connector.

  Keyless access control unit connector B (28P)

  2. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode Power window master switch 37P connector: disconnected Keyless access control unit connector B (28P): disconnected
  Test point 1	Power window master switch 37P connector No. 28 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)

  Test point 2

  Keyless access control unit connector B (28P) No. 6

  Is there continuity?

  YES 

  An open or poor connection in the B-CAN_L wire between the keyless access control unit and the power window master switch.

  NO 

  An open or poor connection in the B-CAN_H wire between the keyless access control unit and the power window master switch.

• 8. Open wire check (B-CAN lines):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connectors.

  Power window master switch 37P connector Keyless access control unit connector B (28P)

  3. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode Power window master switch 37P connector: disconnected Keyless access control unit connector B (28P): disconnected
  Test point 1	Power window master switch 37P connector No. 28 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  Test point 2	Keyless access control unit connector B (28P) No. 6

  Is there continuity?

  YES 

  An open or poor connection in the B-CAN_L wire between the keyless access control unit and the power window master switch.

  NO 

  An open or poor connection in the B-CAN_H wire between the keyless access control unit and the power window master switch.