B1627
DTC B1627: RF Unit 1 Not ConnectedDTC B1640: RF Unit 1 Circuit Malfunction
1. Clear the DTCs with the HDS.
2. Select the TROUBLE CODE MENU from the HDS, then enter the SELF CHECK.
3. Do the SELF CHECK.
4. Check for DTCs with the HDS.
Is DTC B1627 and/or B1640 indicated?
YES - Go to step 5.
NO - Go to step 10.
5. Turn the ignition switch OFF.
6. Disconnect the RF unit 1 6P connector.
7. Disconnect the keyless access control unit connector C (17P).
8. Check for continuity between the following RF unit 1 6P connector terminals and keyless access control unit connector C (17P) terminals.
Is there continuity?
YES - Go to step 9.
NO - Repair an open in the wire.
9. Check for continuity between body ground and RF unit 1 6P connector terminals No. 1, No. 2, No. 3, No. 4, No. 5, and No. 6 individually.
Is there continuity?
YES - Repair a short in the wire.
NO - Go to step 10.
10. Connect the voltmeter between RF unit 1 6P connector terminal No. 5 and body ground.
11. Select the FUNCTION TEST MENU from the HDS, and do the RF1 RXVCC DRIVING.
Does the voltage change from 0 to about 5 V?
YES - Go to step 12.
NO - Replace the keyless access control unit.
12. Connect the voltmeter between RF unit 1 6P connector terminal No. 6 and body ground.
13. Select the FUNCTION TEST MENU from the HDS, and do the RF1 TXVCC DRIVING.
Does the voltage change from 0 to about 5 V?
YES - Go to step 14.
NO - Replace the keyless access control unit.
14. Connect the voltmeter between RF unit 1 6P connector terminal No. 3 and body ground.
15. Select the FUNCTION TEST MENU from the HDS, and do the RF1 TXDDC OUTPUT.
Does the voltage change from 0 to about 5 V?
YES - Replace the RF unit 1.
NO - Replace the keyless access control unit.