DTC B1657: Rear Bumper LF Antenna Circuit Short
| DTC Description | DTC |
|---|---|
| B1657 Rear bumper 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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .
- 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
3. Do the SELF CHECK.
4. Check for DTCs with the HDS.
DTC Description DTC Rear bumper LF antenna circuit short Is DTC B1657 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 TR+, EXT TR- lines):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connectors.
Keyless access control unit connector A (32P) Rear bumper 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 bumper LF antenna 2P connector: disconnected
Test point 1 Keyless access control unit connector A (32P) No. 24 Test point 2 Body ground Test point 1 Keyless access control unit connector A (32P) No. 8 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire.
NO
The EXT TR+ and EXT TR- wires are not shorted. Go to step 3.
- 3. Shorted wire check (EXT TR+ line to EXT TR- 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 bumper LF antenna 2P connector: disconnected
Test point 1 Keyless access control unit connector A (32P) No. 24 Test point 2 Keyless access control unit connector A (32P) No. 8 Is there continuity?
YES
Repair a short in EXT TR+ wire to EXT TR- wire.
NO
The EXT TR+ and EXT TR- wires are OK. Go to step 4.
- 4. Rear bumper LF antenna circuit output check:
1. Reconnect the keyless access control unit connector A (32P).
2. Turn the vehicle to the ON mode.
3. Select KEYLESS ACCESS CONTROL from the ONE-PUSH START system select menu with the HDS, and enter FUNCTIONAL TESTS.
4. Connect the voltmeter between test points 1 and 2.
Test point 1 Rear bumper LF antenna 2P connector No. 1 Test point 2 Rear bumper LF antenna 2P connector No. 2 5. Select TRUNK/TAILGATE/REAR BUMPER ANTENNA with the HDS.
Is there voltage?
YES
The EXT TR+ and EXT TR- wires are OK. Replace the rear bumper LF antenna - Refer to: Keyless Access LF Antenna (Middle Interior) Removal and InstallationKeyless Access LF Antenna (Front Interior) Removal and InstallationKeyless Access LF Antenna (Rear Interior) Removal and InstallationKeyless Access LF Antenna (Rear Bumper) Removal and Installation .
NO
