DTC B1648

DTC B1648  : Passenger'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
   B1648 Passenger's Door LF Antenna Circuit Open

   Is DTC B1648 indicated?

   YES 

   Go to step 2.

   NO 

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

2. EXT FR AS+, EXT FR AS- line output check

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

   -2. Disconnect the following connector.

   Right-front LF antenna/initiator 2P connector

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode Right-front LF antenna/initiator 2P connector: disconnected
   Test point 1	Right-front LF antenna/initiator 2P connector (female terminals) No. 1:
   Test point 2	Right-front LF antenna/initiator 2P connector (female terminals) No. 2:

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

   Is there voltage?

   YES 

   Replace the right-front LF antenna/initiator .

   NO 

   Go to step 3.

3. Open wire check (EXT FR AS+, EXT FR AS- lines)

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

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

   Terminal A	Right-front LF antenna/initiator 2P connector (female terminals) No. 1:
   Terminal B	Right-front LF antenna/initiator 2P connector (female terminals) No. 2:

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

   -3. Disconnect the following connector.

   Body control module connector F (36P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Body control module connector F (36P): disconnected Right-front LF antenna/initiator 2P connector: disconnected Right-rear LF antenna/initiator 2P connector No. 1 and No. 2: jumped
   Test point 1	Body control module connector F (36P) No. 12
   Test point 2	Body control module connector F (36P) No. 30

   Is there continuity?

   YES 

   The EXT FR AS+ and EXT FR AS- wires are OK. Replace the body control module (Keyless Access Control Unit) .

   NO 

   Repair an open or high resistance in the wire.