DTC U0199: Keyless Access Control Unit Lost Communication With Door Multiplex Control Unit

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Press the engine start/stop button to select the OFF, ACC, and ON mode.
Wait for at least 6 seconds.
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 between the keyless access control unit and the door multiplex control unit.
From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS.
Is the power window unit detected?

YES -Go to step 10.

NO -Go to step 6.
Measure the voltage between body ground and power window master switch 37P connector terminal No. 13.

Fig 1: Measuring Voltage Between Body Ground And Power Window Master Switch 37P Connector Terminal No. 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 9.

NO -Go to step 7.
Press the engine start/stop button to select the OFF mode.
Check the No. 15 (10 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?

YES -Repair an open or high resistance in the No. 15 (10 A) fuse circuit.

NO -Replace the fuse. If the fuse blows again, repair a short to ground on the No. 15 (10 A) fuse circuit.
Measure the voltage between body ground and power window master switch 37P connector terminals No. 32 and No. 37 individually.

Fig 2: Measuring Voltage Between Body Ground And Power Window Master Switch 37P Connector Terminals No. 32 And No. 37 Individually
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Go to step 10.

NO -Repair an open or high resistance in the ground wire(s) or poor ground (G401) and/or (G402).
Press the engine start/stop button to select the OFF mode.
Disconnect the power window master switch 37P connector.
Disconnect keyless access control unit connector B (32P).
Check for continuity between power window master switch 37P connector terminals No. 33 and No. 35 and keyless access control unit connector B (32P) terminals No. 7 and No. 8 respectively.

Fig 3: Checking For Continuity Between Power Window Master Switch 37P Connector Terminals No. 33 And No. 35 And Keyless Access Control Unit Connector B (32P) Terminals No. 7 And No. 8
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the power window master switch (see REAR POWER WINDOW SWITCH TEST/REPLACEMENT ).

NO -Repair an open or poor connection in the B-CAN wire(s) between the keyless access control unit and the door multiplex control unit.