DTC Troubleshooting: B1645
DTC B1645: Driver's Door LF Antenna Circuit Short
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

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

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
B1645 Driver's Door LF Antenna Circuit Short
  

Is DTC B1645 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Shorted wire check (EXT FR DR+, EXT FR DR- lines):

Shorted 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 F (36P)
Driver's door outer handle 8P connector

?3.
Check for continuity between test points 1 and 2 individually.
Test condition
Vehicle OFF (LOCK) mode
Body control module connector F (36P): disconnected
Driver's door outer handle 8P connector: disconnected
Test point 1
Body control module connector F (36P) No. 13
Test point 2
Body ground

Test point 1
Body control module connector F (36P) No. 31
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The EXT FR DR+, EXT FR DR- wires are not shorted. Go to step 3.
3.
Shorted wire check (EXT FR DR+ to EXT FR DR- line):

Shorted wire check (EXT FR DR+ to EXT FR DR- line)
?1.
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
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
     
     
     
Repair a short in EXT FR DR+ to EXT FR DR- wire.?
     
NO
     
     
     
The EXT FR DR+ and EXT FR DR- wires are OK. Go to step 4.
4.
EXT FR DR+, EXT FR DR- line output check:

EXT FR DR+, EXT FR DR- line output check
?1.
Reconnect the following connector.
Body control module connector F (36P)

?2.
Turn the vehicle to the ON mode.

?3.
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 No. 2
Test point 2
Driver's door outer handle 8P connector No. 6


Is there voltage?

     
YES
     
     
     
Faulty driver's door LF antenna; replace the driver's door outer handle.?
     
NO