2004 KIA Optima

What were you doing when everything quit? Jump Start your Car?

If the switch is replaced,then it can be wiring issue or faulty cruise control board.But as the switch is replaced,get the voltage at the switch tested to confirm the switch is actually receiving voltage.If no voltage received at switch power supply wire then ,apply external 12 volt power to the cruise control switch wire and then see if cruise control comes ON.If yes,then you know wiring is issue.
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On this case, to troubleshoot this problem, there are solved help links. Click the link directly and refer the details to solve this problem yourself, with help of diagrams: ------

Ford ranger cruise control not working? http://technoanswers.blogspot.in/2012/02/ford-ranger-cruise-control-not-working.html

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Horn and Cruise control quit working?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working.html

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Horn and cruise control not working on Plymouth Grand Voyager?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-not-working-on.html

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Horn and Cruise control quit working on 2003 Jaguar S-Type?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working-on.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500

http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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Cruise control stop working on 1994 Ford ranger?

http://technoanswers.blogspot.in/2012/02/cruise-control-stop-working-on-1994.html

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Cruise control not working?

http://schematicsdiagram.blogspot.com/2011/12/cruise-control-not-working.html

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1996 Ford Explorer: Cruise Control Wiring Diagram?

http://schematicsdiagram.blogspot.in/2012/06/1996-ford-explorer-cruise-control.html

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These will help.

Thanks.

On these case,to troubleshoot these problem,there are solved help links.Click the link directly and refer the details to solve these problem yourself,with help of diagrams:------
Ford ranger cruise control not working?

http://technoanswers.blogspot.in/2012/02/ford-ranger-cruise-control-not-working.html

----------- Horn and Cruise control quit working?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working.html

--------

Horn and cruise control not working on Plymouth Grand Voyager?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-not-working-on.html

------------------
Horn and Cruise control quit working on 2003 Jaguar S-Type? http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working-on.html

-------------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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Cruise control stop working on 1994 Ford ranger? http://technoanswers.blogspot.in/2012/02/cruise-control-stop-working-on-1994.html

----------
Cruise control not working? http://schematicsdiagram.blogspot.com/2011/12/cruise-control-not-working.html

--------------
1996 Ford Explorer: Cruise Control Wiring Diagram?

http://schematicsdiagram.blogspot.in/2012/06/1996-ford-explorer-cruise-control.html
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These will help.
Thanks.

When you are talking about "indicators" we could assuming that your are refer about signal lights. This work with "flashers" devices.

For 1996 Audi A4 2.8L SFI 6cyl the Flasher is located in front seating area, driver side, under dash, behind dash lower panel, mounted above driver side of steering column.

About generic fuses, open the driver side door. Remove panel on left side of dash. Fuse box is behind panel:

Fuse # / Description / Amps
1 / Heated washer jets / 5
2 / Turn signals flasher unit / 10
3 / Headlight washer, illumination of glove compartment, engine compartment, climate control, automatic transmission, instrument cluster / 5
4 / License plate light / 5
5 / Instrument cluster, seat heating, test connection for cruise control, bulb monitor for auto-check control, Automatic transmission display, switch lighting, mirror switches and actuators, airbag warning light, outside temperature indicator, Climate control / 10
6 / Central locking system / 5
7 / Anti-lock brake system / 10
8 / Vacant
9 / Mirror heating / 10
10 / Vacant
11 / Cruise control (automatic transmission) / 5
12 / On board diagnostic system / 10
13 / Brake lights / 10
14 / Interior lights, reading lights, anti-theft alarm system, vanity mirror / 10
15 / Instrument cluster, power windows, climate control, automatic transmission / 10
16 / Anti-lock brake system, Anti-Slip-Regulation / 5
17 / Heated door locks / 10
18 / High beam right / 10
19 / High beam left / 10
20 / Low beam right / 15
21 / Low beam left / 15
22 / Tail and side marker right / 5
23 / Tail and side marker left / 5
24 / Wiper and washer system / 25
25 / Blower for heating, climate control / 30
26 / Rear window defogger, mirror heating / 30
27 / Rear window wiper / 15
28 / Fuel pump / 15
29 / Engine timing / 20
30 / Sun roof / 20
31 / Tail lights, cruise control, automatic transmission / 15
32 / Engine timing / 20
33 / Cigarette lighter / 15
34 / Engine timing / 15
35 / Trailer receptacle / 30
36 / Fog lights / 15
37 / Radio / 20
38 / Luggage compartment light, central locking system / 15
39 / Emergency flasher / 15
40 / Horn / 25
41 / Anti-lock brake system / 25
42 / Vacant
43 / Vacant
44 / Seat heating / 30

Hope this helps (remember to rate and comme this free answeer).

Does your cruise control work? If not it is the brake light switch. It will be a small mechanical switch that will be activated when pushing down on the brake pedal. May need a new switch or just adjusting.

Fuses: Fuse arrangement in fuse panel, behind instrument cluster, left
Fuse Arrangement In Fuse Panel

1 - Heated washer jets 5A 2 - Turn signals 10A 3 - Headlight washer (relay), illumination for glove
compartment, climate control, Automatic Transmission, instrument cluster 5A 4 - License plate light 5A 5 - Instrument cluster, seat heating, test connection
for cruise control, bulb monitor for auto-check display, Automatic Transmission display, switch
lighting, mirror switches and actuators, airbag
warning light, outside temperature indicator,
climate control 10A 6 - Central locking system 5A 7 - Anti-lock brake system (ABS) 10A 8 - Vacant 9 - Mirror heating 10A 10 - Vacant 11 - Cruise control (Automatic Transmission) 5A 12 - On board diagnostic system 10A 13 - Brake lights 10A 14 - Interior lights, reading lights, anti-theft alarm system, vanity mirror 10A 15 - Instrument cluster, power windows, climate control, automatic transmission 10A 16 - Anti-lock brake system (ABS), Anti-Slip Regulation (ASR) 5A 17 - Heated door locks 10A 18 - High-beam, right 10A 19 - High-beam, left 10A 20 - Low-beam, right 15A 21 - Low-beam, left 15A 22 - Side marker and tail light, right 5A 23 - Side marker and tail light, left 5A 24 - Wiper and washer system 25A 25 - Blower for heating, climate control 30A 26 - Rear window defogger, mirror heating 30A 27 - Rear window wiper 15A 28 - Fuel Pump 15A 29 - Engine timing 30A 30 - Sun roof 20A 31 - Tail lights, cruise control, automatic transmission 15A 32 - Engine timing 20A 33 - Cigarette lighter 15A 34 - Engine timing 15A 35 - Trailer recptacle 30A 36 - Fog lights 15A 37 - Radio 20A 38 - Luggage compartment light, central locking system 15A 39 - Emergency flasher system 15A 40 - Horn 25A 41 - Anti-lock brake system (ABS) 25A 42 - Vacant 43 - Vacant

It sounds as if your brake light switch is bad, or, your brake pedal return spring isn't pulling the pedal back towards the seat.

First, just pull up on the brake pedal, opposite direction of when you are applying them & see if the lights go off. If yes, you'll need a new return spring. If not, then usually the switch mounted up above the pedal is defective & needs to be replaced.

I believe once that is corrected, the lights should work properly if your parking lights are working, as they both use the same circuit. If not, you'll have to do some testing of those wires & backtrack to the light switch.

The Brake light switch also can have the cruise control switch & other controls associated with it but not always, depending on the specific Model & Year & other options so testing it could require a wiring diagram, I've included a link that will give you the wiring colors for the brake light switch itself. Testing the wiring is the only way to determine any other condition that would be causing that to happen.

Here's the link for the wiring:
http://www.commandocaralarms.com/wiring/2003-2005/Kia/Optima/893.html

It shows the brake switch wires as GREEN.
Good Luck.

First this only applies if your cruise buttons are on your steering wheel. If so look into a possible problem with the clockspring mounted in your steering column! Good Luck!

If the air bag light is blinking count the blinks for the code. Example.. If the air bag light flashes once and then a short pause and then two blinks you would have a code 12. and so on. If it just stays on you will need to take it into a repair shop and get it checked. My best guess without looking at it would be that the clockspring is not working properly. Most of the time when the clockspring goes out other things stop working like the horn or cruise control or something that is on the steering wheel. Hope this helps.

make sure to check all the fuses and specially tmake sure your brakes lights works because they comuncate w/ cruise