DTC Troubleshooting: 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.
Front passenger's*1 is for 4-door, passenger's*2 is for 2-door.

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

1.
Problem verification:

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.

?4.
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:

EXT FR AS+, EXT FR AS- line output check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Front passenger's*1/passenger's*2 door outer handle 8P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Front passenger's*1/passenger's*2 door outer handle 8P connector: disconnected
Test point 1
Front passenger's*1/passenger's*2 door outer handle 8P connector No. 2
Test point 2
Front passenger's*1/passenger's*2 door outer handle 8P connector No. 6


Is there voltage?

     
YES
     
     
     
Faulty front passenger's*1/passenger's*2 door LF antenna; replace the front passenger's*1/passenger's*2 door outer handle.?
     
NO
     
     
     
Go to step 3.
3.
Open wire check (EXT FR AS+, EXT FR AS- lines):

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
Front passenger's*1/passenger's*2 door outer handle 8P connector No. 2
Terminal B
Front passenger's*1/passenger's*2 door outer handle 8P connector No. 6


?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
Front passenger's*1/passenger's*2 door outer handle 8P connector: disconnected
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.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?