DTC B1647

DTC B1647  : Passenger'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.

   One-Push - KEYLESS ACCESS CONTROL UNIT - SELF CHECK

   -3. Do the SELF CHECK.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   B1647 Passenger's Door LF Antenna Circuit Short

   Is DTC B1647 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_AS+, EXT_FR_AS- lines)

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

   -2. Disconnect the following connectors.

   Body control module connector F (36P)

   Front passenger's door outer handle 8P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Body control module connector F (36P): disconnected Front passenger's door outer handle 8P connector: disconnected
   Test point 1	Body control module connector F (36P) No. 12
   Test point 2	Body ground

   Test point 1	Body control module connector F (36P) No. 30
   Test point 2	Body ground

   Is there 1.0 MΩ or more?

   YES 

   The EXT_FR_AS+ and EXT_FR_AS- wires are not shorted. Go to step 3.

   NO 

   Repair a short to ground in the wire.

3. Shorted wire check (EXT_FR_AS+ line to EXT_FR_AS- line)

   -1. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Body control module connector F (36P): disconnected Front passenger's 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 1.0 MΩ or more?

   YES 

   The EXT_FR_AS+ and EXT_FR_AS- wires are OK. Go to step 4.

   NO 

   Repair a short in EXT_FR_AS+ wire to EXT_FR_AS- wire.

4. Body control module EXT_FR_AS+, EXT_FR_AS- line output check

   -1. Reconnect the following connector.

   Body control module connector F (36P)

   -2. Turn the vehicle to the ON mode.

   -3. Select KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter FUNCTIONAL TESTS.

   One-Push - KEYLESS ACCESS CONTROL UNIT - FUNCTIONAL TESTS

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

   Test condition

   Vehicle ON mode Front passenger's door outer handle 8P connector: disconnected

   Test point 1	Front passenger's door outer handle 8P connector (female terminals) No. 2:
   Test point 2	Front passenger's door outer handle 8P connector (female terminals) No. 6:

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

   -5. Select FRONT PASSENGER (DOOR) ANTENNA L DC OUTPUT with the HDS.

   Is there voltage?

   YES 

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

   NO 

   Replace the body control module .