B1640

DTC Troubleshooting: B1640

DTC B1640:

RF Unit 1 Not Connected

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 B1640 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 the RF unit 1 3P connector.

7. Disconnect keyless access control unit connector B (32P).

8. Check for continuity between the following RF unit 1 3P connector terminals and keyless access control unit connector B (32P) terminals.









Is there continuity?

YES -

Go to step 9.

NO -

Repair an open or high resistance in the wire.�

9. Check for continuity between body ground and RF unit 1 3P connector terminals No. 1, No. 2, and No. 3 individually.





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Substitute a known-good RF unit 1. If the symptom goes away, replace the original RF unit 1 Keyless Access RF Unit 1 Replacement. If not, replace the keyless access control unit.�