DTC Troubleshooting: 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 Description
DTC
B1646 Driver'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
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.
Body control module EXT FR DR?, EXT FR DR? line output check:

Body control module EXT FR DR?, EXT FR DR? line output check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Driver's 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
Driver's door outer handle 8P connector: disconnected
Test point 1
Driver's door outer handle 8P connector (female terminals) No. 2:
Test point 2
Driver's door outer handle 8P connector (female terminals) No. 6:


Is there voltage?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Open wire check (EXT FR DR?, EXT FR DR? lines):

Open wire check (EXT FR DR?, EXT FR DR? lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?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:


?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
Driver's door outer handle 8P connector: disconnected
Driver's door outer handle 8P connector No. 2 and No. 6: jumped
Test point 1
Body control module connector F (36P) No. 13
Test point 2
Body control module connector F (36P) No. 31

Is there continuity?

     
YES
     
     
     
The EXT FR DR? and EXT FR DR? wires are OK. Replace the body control module.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?