DTC : B1663

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 - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

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
   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 (RR INT LF+, RR INT LF- lines)

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

   - 2. Disconnect the following connectors.

   Keyless access/TPMS control unit connector A (32P)

   Rear interior LF antenna 2P connector

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

   Test condition	Vehicle OFF (LOCK) mode Keyless access/TPMS control unit connector A (32P): disconnected Rear interior LF antenna 2P connector: disconnected
   Test point 1	Keyless access/TPMS control unit connector A (32P) No. 11 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Body ground

   Test point 1	Keyless access/TPMS control unit connector A (32P) No. 27 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The RR INT LF+ and RR INT LF- wires are not shorted. Go to step 3.

3. Shorted wire check (RR INT LF+ line to RR INT LF- line)

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

   Test condition	Vehicle OFF (LOCK) mode Keyless access/TPMS control unit connector A (32P): disconnected Rear interior LF antenna 2P connector: disconnected
   Test point 1	Keyless access/TPMS control unit connector A (32P) No. 11 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Keyless access/TPMS control unit connector A (32P) No. 27 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

   Is there continuity?

   YES 

   Repair a short in RR INT LF+ wire to RR INT LF- wire.

   NO 

   The RR INT LF+ and RR INT LF- wires are OK. Go to step 4.

4. Keyless access/TPMS control unit RR INT LF+, RR INT LF- line output check

   -1. Reconnect the following connector.

   Keyless access/TPMS control unit connector A (32P)

   - 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. Connect the voltmeter to 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. 2
   Test point 2	Rear interior LF antenna 2P connector No. 1

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

   - 5. Select CABIN REAR ANTENNA L DC OUTPUT with the HDS.

   Is there voltage?

   YES 

   Faulty rear interior LF antenna; replace the Keyless Access LF Antenna (Rear Interior) Removal and Installation .

   NO 

   Replace the Keyless Access/TPMS Control Unit - Removal and Installation .