DTC B1663: Rear Interior LF Antenna Circuit Short

DTC (Keyless Access Control Unit)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

1. Problem verification:

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTCs with the HDS.

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

   - 4. Do the SELF CHECK.

   - 5. 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 below.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Shorted wire check (EXT R+, EXT R- lines):

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

   - 2. Disconnect the following connectors.

   Keyless access control unit connector A (32P)

   Rear interior LF antenna 2P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	Keyless access control unit connector A (32P): disconnected
   	Rear interior LF antenna 2P connector: disconnected
   Test point 1	Keyless access control unit connector A (32P) No. 11
   Test point 2	Body ground

   Test point 1	Keyless access control unit connector A (32P) No. 27
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

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

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Keyless access control unit connector A (32P): disconnected
   	Rear interior LF antenna 2P connector: disconnected
   Test point 1	Keyless access control unit connector A (32P) No. 11
   Test point 2	Keyless access control unit connector A (32P) No. 27

   Is there continuity?

   YES 

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

   NO 

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

4. EXT R+, EXT R- line output check:

   Reconnect the following connector.

   Keyless access control unit connector A (32P)

   - 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 No. 1
   Test point 2	Rear interior LF antenna 2P connector No. 2

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

   Is there voltage?

   YES 

   Replace the rear interior LF antenna - Refer to: Keyless Access LF Antenna (Rear Interior) Removal and Installation .

   NO 

   Replace the keyless access control unit .