: Problems, help, and questions for 2005+ STS -- FAQ -- CLICK HERE FIRST!!!

04-22-07, 05:44 PM
Updated 10/15/2011

If you have a specific problem not addressed by this FAQ, please search for an existing discussion or create a new thread.

Please create a new thread for questions, comments, and issues. Use this thread as a reference point to link to other threads that may be useful to fellow STS owners.

The following links are for 2005 and later Cadillac STS -only-. If you have questions regarding a 2004 or older Seville, click here (http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/).

General Information:
Parts diagrams (http://www.compnine.com/)

Owner's Manuals (http://www.cadillac.com/manuals/)

Climate control and HVAC:
Fix for climate control noises (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/72009-farting-groaning-noise-climate-control-system.html)

iPhone Compatibility/Issues (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/120754-2008-sts-bluetooth-iphone.html)


Playing DVDs while driving (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/61385-sts-navigation.html)

Upgrading Onstar from analog to digital (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/58960-onstar-digital-upgrade.html)

Adding factory navigation (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/181473-added-nav-non-nav-sts-100-a.html)

Reducing brake dust (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/166467-just-some-helpful-info-i-found.html)

Driveline and Powertrain:

Intake bolts loose on V8:
http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/205392-northstar-owners-might-want-check.html and

http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/218068-how-properly-do-coolant-flush.html - How to change coolant on V8

http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/118887-anybody-change-fluid.html - How to change transmission fluid (and whether you should)

Exceeding the speed limiter (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/164754-my-northstar-topped-out-only-107-a.html)

Lug pattern for wheels (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/163121-lug-pattern.html)

V6 timing chain failures (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/175917-timing-belt-broke-2006-sts-53-a.html)

Differential leaks (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/92411-rear-differential-leak-again.html)

GM recall for rear end leaks (http://deseretnews.com/dn/view/0,5143,695238794,00.html)

AWD STS4 transmission software update (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/87970-awd-sts4-transmission-software-fix.html)

Body, Electrical, and Interior:

Battery replacement (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/148112-sts-battery-replacement.html)

Door lock problems and issues (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/213539-help-front-doors-wont-open-2.html)

Driver seat wiggling (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/84450-wiggly-seats.html?highlight=seats)

Peeling start button (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/127987-start-button-peeling.html)

Shattering rear glass (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-beyond/94497-2005-sts-back-glass.html)

Wind noise from window (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/162372-wind-noise-window.html)

Programming Key Fob (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/164941-keyless-fob.html)

Buying a replacement key fob (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/176322-where-purchase-additional-key-fob.html)

Hardwiring Radar Detector (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/165219-8500-x50-hardwire.html)

Ashtray problems (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/163879-ashtray-wont-open.html)

Complete STS lighting and bulb guide (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/176159-complete-correct-sts-interior-exterior-light.html)

Upgrading 05 to 08 front fascia (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/198088-my-05-08-fascia-upgrade.html)

Fog light replacement (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2010/201746-foglight-out.html)

Moisture in headlights (http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/233934-how-fix-clear-my-headlights.html)

01-14-10, 12:57 AM
If anyone wants to add something to this list, please post a link to the thread or topic here. No advertising please.

01-24-10, 09:12 AM
Clicked this thread trying to find owner's manuals. They aren't in the list, so here goes:


01-31-10, 04:03 AM
^^ Thanks for the 2009 & 2010 manuals


03-26-10, 09:40 PM


04-05-10, 01:41 PM
Cadillac Parts link with part numbers:

This site is a good start. Find the diagram with the part you are looking for and click on it, then scroll down to find your part# and price. I'm not sure the #'s are current and correct but it is a good start.

(thanks to Lifer for the link) http://www.compnine.com

03-08-11, 09:10 PM
You're talking about gmownercenter.yahoo.com I presume, and I can still see the Nav manual for my '06. The key is to claim that you own a car from the year you want manuals. You don't have to put in a VIN, although that's the easiest way to do it.

Or just

2009 Nav (http://content.gmownercenter.yahoo.com/docs/manuals/cadillac/2009_cadillac_sts_navigation.pdf)
2008 Nav (http://content.gmownercenter.yahoo.com/docs/manuals/cadillac/2008_cadillac_sts_navigation.pdf)
2007 Nav (http://content.gmownercenter.yahoo.com/docs/manuals/cadillac/2007_cadillac_sts_navigation.pdf)

05-03-11, 05:39 PM


Aiming of each of the headlamps is done by turning the vertical (1) adjusting screw which moves the headlamp bulb in relation to the headlamp assembly. The adjusting screw is located inboard of the front fender wheelhouse panel. The high beam will be correctly aimed if the low beam is aimed properly.

Some state and local authorities have specific requirements for aiming the headlamps. These requirements must be followed.

Aiming Area Preparation
Choose an appropriate aiming area, then prepare the aiming screen:

The aiming area should be darkened and large enough to accommodate the vehicle and an additional 7.62 m (25 ft) measured from the face of the headlamp capsules to the front of the screen.
The floor on which the vehicle rests must be flat with the bottom of the screen.
The aiming screen should be at least 1.52 m (5 ft) high by 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands. The screen should be provided with a vertical centerline (3), 2 laterally adjustable vertical tapes (2), and one vertically adjustable horizontal tape (1).
The screen must be movable to be aligned parallel with the rear axle of the vehicle. This will allow for a horizontal line drawn perpendicular to the centerline of the screen to pass through the center point between the 2 headlamp capsules (4).

IMPORTANT: Adjust the horizontal line or tape (1) on the screen. for each vehicle tested. Vehicles of the same model and year may have different standing height for the headlamp.

After the aiming screen has been set up in a permanent location, paint or tape a reference line on the floor 7.62 m (25 ft) from the screen, to identify the proper location of the headlamp capsules (5) being aimed.If a regular commercial aiming screen is not available, use a vertical wall having a clear uninterrupted area at least 1.83 m (6 ft) high by 3.66 m (12 ft) wide, finished with a washable non-gloss white paint.

Vehicle Preparation
Prepare the vehicle for adjusting the headlamp beam aim:

Verify that all the components are in place on the vehicle, if other service has been performed on the vehicle.
The vehicle must have a full tank of gas.
Verify that the tires are inflated to the proper pressures.
Stop all other work on the vehicle.
Position the vehicle squarely with the aiming screen and with the headlamp directly over the reference line which is painted or taped on the floor.
Locate the vertical center line on the aiming screen (3) to be in line with the center of the vehicle (4). This can be accomplished by sighting through the center of the rear window and over the hood.Mark the vertical center of the front and rear windows with narrow tape. Use these marks as sights to locate the centerline of the vehicle. Move the vehicle or the screen until the center line of the screen comes into alignment with the 2 points.
Close the doors.
Rock the vehicle sideways to stabilize the suspension.
Measure the height (6) from the floor to the aiming dots of the headlamps. Adjust the horizontal tape (1) on the aiming screen to match this dimension.
Measure the distance (5) between the headlamp aiming dots. Position the vertical tapes (2) this distance equally to the right and left of the centerline.

Headlamp Aiming Procedure

Open the hood.
Measure from the floor to the center of the headlamp bulb. Some headlamps have an aim dot marked on the headlamp lens.
At the screen, measure from the floor and place the horizontal tape at the measured distance.
Measure from the reference line on the floor to the left headlamp bulb centerline.
At the screen, measure from the reference line and place the vertical tape at the measured distance.
Measure from the reference line on the floor to the right headlamp bulb centerline.
At the screen, measure from the reference line and place the vertical tape at the measured distance.

Turn ON the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp. IMPORTANT: Do not cover the headlamp. This may cause excessive heat build up.

Adjust the vertical aim of the headlamps to the specifications required by the state and the local authorities, or as shown in step 8. IMPORTANT: Horizontal headlamp adjustment does not exist.
Rotate the headlamp adjuster (1) to change the vertical aim of the headlamp.
Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
Close the hood.

06-25-11, 08:56 PM
Please create a new thread for questions, comments, and issues. Use this thread to link to other threads that may be useful to fellow STS owners.

06-16-13, 04:53 PM
Door handle switch replacement:


09-28-13, 10:31 AM
Condensation in my passenger side head lamp. Is there a fix for this?

09-28-13, 10:38 AM
First post, last link titled "moisture in headlights" just gotta scroll up.


There are so many threads about this. As a matter of fact there is a very recent one. http://www.cadillacforums.com/forums/cadillac-sts-forum-2005-through-2012/371770-moisture-2007-sts-v-headlight.html

01-25-14, 12:54 PM
Hi all new to this forum. Is there anyone out there that can make some suggestions as to what to do next? I have a 2005 STS v6. I have had my car in 3 different shops. The check engine light flashed on and off, then steady. Codes PO300 PO301 PO200 and runs like crap. The first shop said to take it to a GM shop, they didn't want to guess. The second ( a GM mechanic) put an alternator on it and charged me $400. I made it less than 5 miles down the road when it happened again and I took it back.They kept it for 3 weeks before they threw up their hands and told me to take it to someone else. The third shop a former Cadillac dealer and still a GM dealer charged me $1000 + and replaced the computer. I was able to drive it home..about 17 miles, without issue. It wouldn't start the next morning so as per dealer recommendation on my repair order I purchased a new battery. It ran for a total of 5 miles before the check engine lights came on again and it's running even more codes pointing at fuel injectors(?) etc. Codes PO261,267 300 301 and 8 more that I can't remember. The dealer that replaced the computer doesn't take my call. I just want my flipping car fixed. I love my car but this is getting to be more than me and my bank account can take! :banghead: Any suggestions would be helpful before I push it off a cliff or part it out. Thanks

01-25-14, 06:27 PM
Timing chains.

01-26-14, 10:16 AM
Thanks....not sure If I want to put anymore money in it or cut my losses.