DTC 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 (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
   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)

   -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 individually.

   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	Body ground

   Test point 1	Body control module connector C (66P) No. 62
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The EXT FR DR+ and EXT FR DR- wires are not shorted. Go to step 3.

3. 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 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	Body control module connector C (66P) No. 62

   Is there continuity?

   YES 

   Repair a short between the wires.

   NO 

   The EXT FR DR+ and EXT FR DR- wires are OK. Go to step 4.

4. Driver's door outer handle LF antenna internal resistance check

   -1. On the LF antenna side, measure the resistance 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	Driver's door outer handle 8P connector (male terminals) No. 2:
   Test point 2	Driver's door outer handle 8P connector (male terminals) No. 6:

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

   Is there overrange?

   YES 

   Replace the body control module .

   NO 

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