DTC B1663: Rear Interior Antenna Circuit Shorted

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Select MODE MENU from the HDS, then enter SELF CHECK.
Check for DTCs with the HDS.
Is DTC B1663 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time. Check for loose or poor connections.
Turn the ignition switch to LOCK (0).
Disconnect keyless access control unit connector B (24P).
Disconnect the rear interior LF antenna 2P connector.
Check for continuity between body ground and keyless access control unit connector B (24P) terminals No. 2 and No. 3 individually.

Fig 1: Checking Continuity Between Body Ground And Keyless Access Control Unit Connector B (24P) Terminals No. 2 And No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to ground in the wire.

NO -Go to step 9.
Reconnect keyless access control unit connector B (24P).
Connect the voltmeter between rear interior LF antenna 2P connector terminals No. 1 and No. 2.

Fig 2: Connecting Voltmeter Between Rear Interior LF Antenna 2P Connector Terminals No. 1 And No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Select FUNCTION TEST from the HDS, and do REAR INTERIOR ANTENNA L DC OUTPUT.
Is there voltage?

YES -Replace the rear interior LF antenna (see REAR INTERIOR LF ANTENNA REPLACEMENT ).

NO -Replace the keyless access control unit (see KEYLESS ACCESS CONTROL UNIT INPUT TEST/REPLACEMENT ).