DTC Troubleshooting: B1663

DTC B1663  : Rear Interior 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

   Do the SELF CHECK.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   B1663 Rear Interior LF Antenna Circuit Short

   Is DTC B1663 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 M+, EXT M- lines)

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

   -2. Disconnect the following connectors.

   Body control module connector F (36P)Rear interior LF antenna 2P 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 Rear interior LF antenna 2P connector: disconnected
   Test point 1	Body control module connector F (36P) No. 35
   Test point 2	Body ground

   Test point 1	Body control module connector F (36P) No. 17
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

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

3. Shorted wire check (EXT M+ to EXT M- line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Body control module connector F (36P): disconnected Rear interior LF antenna 2P connector: disconnected
   Test point 1	Body control module connector F (36P) No. 35
   Test point 2	Body control module connector F (36P) No. 17

   Is there continuity?

   YES 

   Repair a short in EXT M+ to EXT M- wire.

   NO 

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

4. EXT M+, EXT M- 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 Rear interior LF antenna 2P connector: disconnected
   Test point 1	Rear interior LF antenna 2P connector (female terminals) No. 1:
   Test point 2	Rear interior LF antenna 2P connector (female terminals) No. 2:

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

   Is there voltage?

   YES 

   Faulty rear interior LF antenna; replace the rear interior LF antenna .

   NO 

   Replace the body control module .