DTC Troubleshooting: B1662, B1668
DTC B1662: Middle Interior Antenna Circuit Opened
DTC B1668: Rear Shelf (Middle Interior) LF Antenna Circuit Open
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

DTC Description
DTC
B1662 Middle Interior Antenna Circuit Opened
  
B1668 Rear Shelf (Middle Interior) LF Antenna Circuit Open
  

1.
Problem verification:

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
B1662 Middle Interior Antenna Circuit Opened
  
B1668 Rear Shelf (Middle Interior) LF Antenna Circuit Open
  

Is DTC B1662 or B1668 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Body control module EXT M?, EXT M? line output check:

Body control module EXT M?, EXT M? line output check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Middle interior LF antenna 2P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Middle interior LF antenna 2P connector: disconnected
Test point 1
Middle interior LF antenna 2P connector (female terminals) No. 2:
Test point 2
Middle interior LF antenna 2P connector (female terminals) No. 1:


Is there voltage?

     
YES
     
     
     
Faulty middle interior LF antenna; Replace the middle interior LF antenna.?
     
NO
     
     
     
Go to step 3.
3.
Open wire check (EXT M?, EXT M? lines):

Open wire check (EXT M?, EXT M? lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Connect terminals A and B with a jumper wire.
Terminal A
Middle interior LF antenna 2P connector (female terminals) No. 2:
Terminal B
Middle interior LF antenna 2P connector (female terminals) No. 1:


?3.
Disconnect the following connector.
Body control module connector F (36P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Body control module connector F (36P): disconnected
Middle interior LF antenna 2P connector: disconnected
Test point 1
Body control module connector F (36P) No. 15
Test point 2
Body control module connector F (36P) No. 33

Is there continuity?

     
YES
     
     
     
The EXT M? and EXT M? wires are OK. Replace the body control module.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?