DTC B1649
DTC B1649 : Driver Side Rear Passenger Door LF Antenna circuit short
| DTC Description | DTC |
|---|---|
| B1649 DRIVER SIDE REAR PASSENGER DOOR 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 .
- 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
Do the SELF CHECK.
-4. Check for DTCs with the HDS.
DTC Description DTC B1649 DRIVER SIDE REAR PASSENGER DOOR LF ANTENNA CIRCUIT SHORT Is DTC B1649 indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- Shorted wire check (RL WHEEL LF+, RL WHEEL LF- lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
Keyless access/TPMS control unit connector A (32P) Left-rear LF antenna/initiator 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 Left-rear LF antenna/initiator 2P connector: disconnected Test point 1 Keyless access/TPMS control unit connector A (32P) No. 16 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs Test point 2 Body ground Test point 1 Keyless access/TPMS control unit connector A (32P) No. 32 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire.
NO
The RL WHEEL LF+ and RL WHEEL LF- wires are not shorted. Go to step 3.
- Shorted wire check (RL WHEEL LF+ line to RL WHEEL 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 Left-rear LF antenna/initiator 2P connector: disconnected Test point 1 Keyless access/TPMS control unit connector A (32P) No. 16 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs Test point 2 Keyless access/TPMS control unit connector A (32P) No. 32 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2022 2023) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs Is there continuity?
YES
Repair a short in RL WHEEL LF+ wire to RL WHEEL LF- wire.
NO
The RL WHEEL LF+ and RL WHEEL LF- wires are OK. Go to step 4.
- Keyless access/TPMS control unit RL WHEEL LF+, RL WHEEL 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
Connect the voltmeter to test points 1 and 2.
Test condition Vehicle ON mode Left-rear LF antenna/initiator 2P connector: disconnected Test point 1 Left-rear LF antenna/initiator 2P connector No. 2 Test point 2 Left-rear LF antenna/initiator 2P connector No. 1 -5. Select DRIVER SIDE REAR (DOOR) ANTENNA L DC OUTPUT with the HDS.
Is there voltage?
YES
Faulty left-rear LF antenna/initiator; replace the left-rear LF antenna/initiator - Refer to: Keyless Access LF Antenna/Initiator (Left-Rear) Removal and InstallationKeyless Access LF Antenna (Rear Interior) Removal and Installation .
NO