DTC B1646

DTC B1646  : Driver's Door LF Antenna Circuit Open

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

DTC (Keyless Access Control Unit)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Select the KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter the SELF CHECK.

   -3. Do the SELF CHECK.

   SELF CHECK

   Check for DTCs with the HDS.

   DTC Description	DTC
   B1646 Driver's Door LF Antenna Circuit Open

   Is DTC B1646 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Open wire check (EXT FR DR+, EXT FR DR- lines)

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

   -2. Disconnect the following connectors.

   Body control module connector C (66P)

   Driver's door outer handle 8P connector

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

   Test condition	Vehicle OFF (LOCK) mode Body control module connector C (66P): disconnected Driver's door outer handle 8P connector: disconnected
   Test point 1	Body control module connector C (66P) No. 46
   Test point 2	Driver's door outer handle 8P connector (female terminals) No. 2:

   Test point 1	Body control module connector C (66P) No. 62
   Test point 2	Driver's door outer handle 8P connector (female terminals) No. 6:

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The EXT FR DR+ and EXT FR DR- wires are OK. Go to step 3.

   NO 

   Repair an open or high resistance in the wire.

3. DTC check

   -1. Reconnect the following connector.

   Body control module connector C (66P)

   -2. Connect terminals A and B with a jumper wire.

   Terminal A	Driver's door outer handle 8P connector (female terminals) No. 2:
   Terminal B	Driver's door outer handle 8P connector (female terminals) No. 6:

   Courtesy of HONDA, U.S.A., INC.

   -3. Remove all the keyless remotes from inside the vehicle. Hold them outside the open driver's window, at least 20 cm (7.9 in) away from the vehicle.

   -4. Press the power switch button at least 5 times.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B1645 Driver's Door LF Antenna Circuit Short

   Is DTC B1645 indicated?

   YES 

   Faulty LF antenna; replace the driver's door outer handle .

   NO 

   Replace the body control module .