B1626

DTC B1626: Ignition Switch Control Unit No Response

1. Clear the DTCs with the HDS.
2. Select the MODE MENU from the HDS.
3. Do the SELF CHECK.
4. Check for DTCs with the HDS.

Is DTC B1626 indicated?

YES - Go to step 5.

NO - Intermittent failure, the ignition switch control unit is OK at this time. Check for loose or poor connections at the keyless access control unit connector.

5. Register the ignition switch control unit with the HDS.
6. Turn the ignition switch OFF and then back ON (II).
7. Repeat step 6 nine times.
8. Check for DTCs with the HDS.

Is DTC B1626 indicated?

YES - Go to step 9.

NO - Intermittent failure, the ignition switch control unit is OK at this time. Check for loose or poor connections at the keyless access control unit connector.

9. Turn the ignition switch OFF.
10. Disconnect the ignition switch control unit 10P connector.
11. Turn the ignition switch ON (II).




12. Measure voltage between the ignition switch control unit 10P connector terminal No. 9 and body ground.

Is there battery voltage?

YES - Go to step 13.

NO - Check the No. 7 (10 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the driver's under-dash fuse/relay box and ignition knob ECU.




13. Check for continuity between ignition switch control unit 10P connector terminal No. 6 and body ground.

Is there continuity?

YES - Go to step 14.

NO - Check for an open in the wire or a poor ground (G501).

14. Disconnect the keyless access control unit connector A (31P).




15. Check for continuity between the following ignition switch control unit 10P connector terminals and SMART ECU connector A (31P) terminals.

Is there continuity?

YES - Go to step 16.

NO - Repair an open in the wire.




16. Check for continuity between body ground and ignition switch control unit 10P connector terminals No. 3, No. 4, No. 5, No. 7, and No. 8 individually.

Is there continuity?

YES - Repair a short in the wire.

NO - Go to step 17.

17. Reconnect keyless access control unit connector A (31P).




18. Connect the voltmeter between the ignition switch control unit 10P connector terminal No. 5 and body ground.
19. Turn the ignition switch ON (II).
20. Select the FUNCTION TEST from the HDS MODE MENU, and do the IGNTRX LINE DRIVING.

Does the voltage change from about 12 V to 0 V?

YES - Go to step 21.

NO - Replace the keyless access control unit




21. Connect the voltmeter between ignition switch control unit 10P connector terminal No. 4 and body ground.
22. Select the FUNCTION TEST MENU from the HDS, and do the IGNCONT LINE DRIVING.

Does the voltage change from 0 to 5 V?

YES - Replace the ignition switch control unit.

NO - Replace the keyless access control unit.