DTC B1663: Rear Interior LF Antenna Circuit Short

DTC (Keyless Access Control Unit)

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   - 2. Select the MODE MENU from the HDS, then 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
   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. Press the engine start/stop button to select the OFF mode.

   - 2. Disconnect the following connectors.

   Keyless access control unit connector A (32P)

   Rear interior LF antenna 2P connector - Refer to: Keyless Access LF Antenna (Rear Interior) Removal and Installation

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

   Test condition	OFF mode
   	Keyless access control unit connector A (32P): disconnected
   	Rear interior LF antenna 2P connector: disconnected
   Test circuit	EXT R+
   Test point 1	Keyless access control unit connector A (32P) No. 31 (PNK)
   Test point 2	Body ground

   Test circuit	EXT R-
   Test point 1	Keyless access control unit connector A (32P) No. 15 (PUR)
   Test point 2	Body ground

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

   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	OFF mode
   	Keyless access control unit connector A (32P): disconnected
   	Rear interior LF antenna 2P connector: disconnected
   Test circuit	EXT R+, EXT R-
   Test point 1	Keyless access control unit connector A (32P) No. 15 (PUR)
   Test point 2	Keyless access control unit connector A (32P) No. 31 (PNK)

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

   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. Determine possible failure area (Keyless access control unit, rear interior LF antenna)

   - 1. Reconnect the following connector.

   Keyless access control unit connector A (32P)

   - 2. Press the engine start/stop button to select the ON mode.

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

   One-Push - KEYLESS ACCESS CONTROL UNIT - FUNCTIONAL TESTS

   - 4. Connect the voltmeter to test points 1 and 2.

   Test point 1	Rear interior LF antenna 2P connector No. 1 (LT GRN)
   Test point 2	Rear interior LF antenna 2P connector No. 2 (WHT)

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

   - 5. Select CABIN REAR ANTENNA with the HDS.

   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 .