B1648

DTC Troubleshooting: B1648

DTC B1648:

Passenger's Door LF Antenna Circuit Open or Short

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Select the MODE MENU from the HDS, then enter the SELF CHECK.

3. Do the SELF CHECK.

4. Check for DTCs with the HDS.

Is DTC B1648 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

5. Press the engine start/stop button to select the OFF mode.

6. Disconnect keyless access control unit connector A (36P).

7. Disconnect the passenger's door LF antenna 8P connector.

8. Check for continuity between body ground and keyless access control unit connector A (36P) terminals No. 2 and No. 20 individually.





Is there continuity?

YES -

Repair a short to ground in the wire(s).

NO -

Go to step 9.

9. Check for continuity between keyless access control unit connector A (36P) terminals No. 2 and No. 20 and passenger's door LF antenna 8P connector terminals No. 3 and No. 7 respectively.





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open or high resistance in the wire(s).

10. Check for continuity between keyless access control unit connector A (36P) terminals No. 2 and No. 20.





Is there continuity?

YES -

Repair a short between the wires.

NO -

Go to step 11.

11. Reconnect the passenger's door LF antenna 8P connector.

12. Measure the resistance between keyless access control unit connector A (36P) terminals No. 2 and No. 20.





Is there 1-5 Ohms?

YES -

Replace the keyless access control unit.

NO -

Faulty passenger's door LF antenna, replace the front passenger's door outer handle Service and Repair.