DTC Troubleshooting: U0199
DTC U0199:
 Immobilizer-keyless Control Unit Lost Communication with Door Multiplex Control Unit
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs with the HDS.
Is DTC U0199 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.■
  1. From the BODY ELECTRICAL system select menu, select UNIT INFORMATION, and then select CONNECTED UNIT.
Is the door multiplex control unit detected?
YES -
Replace the immobilizer-keyless control unit .■
NO -
Go to Step 6 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the door multiplex control unit 37P connector.
  1. Disconnect the immobilizer-keyless control unit 7P connector.
  1. Check for continuity between the door multiplex control unit 37P connector No. 33 and No. 35 terminals and immobilizer-keyless control unit 7P connector No. 3 and No. 4 terminals individually.
Is there continuity?
YES -
Go to the power window master switch input test, and do all power and ground input tests. If the tests prove OK, replace the gauge control module. ■
NO -
An open in the wire.■