The orange bulb (or rather the clear bulb with the orange condom) that lights the cruise control switch in my 2000 RS burned out recently. This did not affect the operation of my cruise control.

Messing around with the bulbs, I also blew out the fog lamp bulb. After putting things back together, my cruise control would no longer engage.

I installed new bulbs today, and the fog lamp one works great. The cruise control one might work, but since cruise control still doesn't engage, I can't tell.

Does anyone know how to troubleshoot cruise control problems? Thanks for your help.

Mine wasn't working and a few days later I noticed it ran lousy at lower RPM's. Turned out the vacuum hose for the cruise control wasn't on all the way. After I snugged the line hose down the cruise worked fine and the low idle was better as well.

The above will probably only help if you're also seeing poor runnning at lower rpms / idle.

The cruise unit is on the firewall on the passenger side.

That's my only suggestion beyond the typical fuse check.

matt

Thanks. I'll check that out tomorrow!

the hose going to the actuator is easily knocked off by mistake-also check on the clutch pedal bracket were it contacts the clutch switch-there should be a plastic washer the size of a dime that contacts the switch.if missing which ive seen alot-the switch will not close.there will be a vacant hole were the switch contacts-

No luck. The hose seems fine, and the little white discs on the clutch and on the brake press their buttons fine.

I did an ECU reset, but things still weren't better. Maybe the control unit under the dash is dead.

Strangely, my alarm didn't go off when I reconnected the battery. The alarm system seems fine otherwise, though.

please check every fuse in both fuse box,if you no how to use a multi-meter i would be happy to e-mail you the worksheet for the input/output test for the cruise control module,it is very easy to do .this will tell you were the fault is.

just saw that you stated you reset the ecu-does this mean you have a scan tool i assume-if so please tell me what the readings for both (short term)(long term)fuel trims are.if these numbers are high on the positive side it means your lean do to a vacuum leak or other leak-possible the cruise actuator itself.

The short term fuel trim is averaging 1.3%, and the long term fuel trim is averaging -2.3%. I've been running the tool for 5 minutes or so.

I take that back. The short term is pretty steady now at 3.1%.

no your prettyy good there-let me explain this-short term is minor fuel trim changes-long term is manger changes,would you like the diagram for the test

also you didnt state if all the fuses were checked and good-also when you turn the steering wheel from stop to stop do you hear a crunching or scrapping sound-engine running when turning wheel

That might be helpful. I did notice one failure in the diagnostic tests -

The air to fuel ratio sensor circuit middle area (Bank 1 Sensor 1) is 1.46 V. This is below the minimum 1.55 V.

I don't know what this means, though...

need a e-mail to send it to you-you will need adobe reader to open it which is a free download from there site.what make -year -model is this car

I sent a private message with my e-mail address.

My car is a 2000 Impreza RS Sedan.

I checked all the fuses under the hood and behind the change box and even the hidden one under the dash. They were all good.

Forgot to mention this - there are no funny sounds when turning the wheel either.

sendding you the pics of the control unit,input/output test-this will tell you the failed sub circuit in cruise,although i need your e-mail address agian-my (pm) was erased from you

sent the downloads for diagnoisis to you at your email

Those documents look great! I'll check the whole thing out as soon as I can. I'll post back here in a few days.

Well, I finally looked at those pdfs you sent me about the cruise control. I think the files still got cut off by your e-mail.

I did get some of the pages, but I'm not sure what to do. I can pop the connector out of the cruise control unit, but then I don't see many signals when I probe the connector.

Because of how it's mounted, probing the signals on the module is really hard. Maybe I'm doing this wrong...

Is there a web site or something where you found that information?

Thanks.