DTC 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 (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
   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

   -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. 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

   -5. 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:

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

   -6. Select DRIVER (DOOR) ANTENNA L DC OUTPUT with the HDS.

   Is there voltage?

   YES 

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

   NO 

   Go to step 3.

3. 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:

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

   -3. Disconnect the following connector.

   Body control module connector F (36P)

   -4. Measure the resistance 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 1.0 Ω or less?

   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.