View Full Version : 2005 Cadillac STS Information

05-04-04, 10:43 PM
Keyless Access with push button start System
Smart Remote Start
Bose Studio Surround Sound Audio System

The all-new 2005 Cadillac STS is equipped with purposeful technologies developed to ensure an outstanding vehicle experience in terms of luxury, comfort, convenience and safety.

The technological backbone of the STS comes in the form of the GM LAN Serial Data Electrical Architecture – a high- and low-speed data network that connects system modules and ensures that information is properly communicated and shared between them.

In all, the STS is equipped with up to 27 modules, located throughout the vehicle, depending upon options selected. Each module sends and receives information sent via the GM LAN.

This electrical architecture enables the host of purposeful technologies offered on the STS.

Keyless Access with push button start
Keyless Access enables passive vehicle and trunk entry and push-button ignition via a personalized, keyless fob. With the key fob in a pocket or purse, a person can approach a locked vehicle, pull the door handle and open the door. The same concept applies when opening the trunk. As a result, the need to pull keys out – or even the fob – to activate the door and trunk functions has been eliminated. The system uses passive and active antennas to detect the vehicle fob and its proximity to the vehicle.

Keyless Access works in tandem with the vehicle security system, enabling the STS to be started with a momentary push of a button located on the instrument panel. To start the vehicle, the fob must be inside the vehicle, and the brake pedal depressed.

Smart Remote Start system
The Smart Remote Start system, which operates from as far as 200 feet, not only starts the vehicle via fob activation but also automatically adjusts a variety of personalization settings in the process.

When activated via the Smart Remote Start system, the STS – based on temperature inputs – begins to acclimate the occupant environment before the driver gets to the vehicle. Once remote start is initiated, the vehicle:

Adjusts climate control to previously set cabin temperature.
Begins seat heat or ventilation (based on feedback from outside temperature settings).
Activates front and rear window defroster if climate conditions require it.

This extension of functionality is made possible by the electrical architecture on the STS, which allows various systems in the vehicle to work in concert.

Adaptive Cruise Control
The STS can be equipped with Adaptive Cruise Control (ACC), which greatly increases the value and comfort of cruise control, especially in congested traffic situations.

The system uses a radar sensor mounted at the front of the STS that is located behind the grille-mounted wreath & crest to detect objects in its path. If the lane ahead is clear, the system will maintain the set speed. When slower traffic is detected, the system will automatically adjust to a safe distance (which is selected by the driver) by using throttle control and limited braking.

The ACC system used on the STS also incorporates two new features: grade braking and audible alert. With grade braking, the transmission will automatically downshift to maintain selected vehicle speed and distance, preventing overheating of brakes.

The audible alert function operates when ACC is active, notifying the driver when he/she is too close to a preceding vehicle. All adaptive cruise displays are shown through the four-color, reconfigurable head-up display (HUD).

High-performance forward lighting system
The STS is equipped with large 70-millimeter projector beam headlamps for outstanding forward- and spread-light performance. Two projector beams are stacked vertically in each headlamp housing; the upper projectors provide low-beam illumination, and all four projectors are illuminated for high-beam performance.

The tungsten halogen lighting provides an outstanding “punch” – or down the road – lighting as well as excellent spread light. When equipped with an optional high-intensity discharge (HID) xenon lighting system, the 70-millimeter projectors provide even greater forward and spread light. The HID application includes headlamp washers, which are integrated flush to surface on the adjacent front fascia.

On vehicles sold outside North America, the STS will only be equipped with the HID lighting system as well as a dynamic headlamp leveling system – a feature where the lens automatically aligns itself to the vertical height of the road based on vehicle pitch.

Intellibeam automatically switches headlamps from high- to low-beam and back again when oncoming headlamps or forward lighting elements are sensed. The system makes nighttime driving safer by providing the maximum amount of light possible for any driving scenario.

The system uses a state-of-the-art complimentary metal-oxide semiconductor (CMOS) light sensor. Located on the back of the rearview mirror, the CMOS contains a miniature camera, light sensors and microprocessor that sense oncoming light. When it detects an approaching vehicle’s headlights or preceding vehicle’s taillamps, the system turns off the high beams gradually before it distracts other drivers. The system also detects and effectively ignores ambient light coming from streetlights, sign reflections, buildings and other sources.

In situations where light from an approaching vehicle is more immediate, such as when cresting a hill, the Intellibeam system reacts instantaneously, automatically switching to low-beam output of light.

Reconfigurable four-color head-up display
The STS will incorporate a day/night head-up display (HUD) application that is four-color and reconfigurable.

The HUD will incorporate an infotainment data display, tap gear display, shift indicator display and ACC display as well as turn-by-turn directional navigation and audio band, frequency, and pre-set information – all based on driver preference. It is also configurable to five languages: English, French, Spanish, German, and Italian.

A switch located on the instrument panel allows the driver to turn the system off or on.

Bose Studio Surround Sound audio system
One of the industry’s first OEM-installed surround sound audio system – developed by Bose – incorporates 15 speakers and provides concert quality sound to both front occupants and passengers in the rear compartment.

- The optional 300-watt system incorporates the following elements for unmatched 5.1 channel surround sound quality and performance:
- Four 50-millimeter mid-high range speakers integrated with two in each of the driver and front passenger seats.
- Two 2.5-inch full-range outboard speakers positioned in the instrument panel.
- Four 3.5-inch full-range speakers located in the instrument panel, rear console, and rear shelf.
- Two 9-inch powered Neodynium (Nd) woofer assemblies located in the driver and front passenger doors.
- Two 5.25-inch full-range speakers positioned in the rear doors.
- A 12-inch powered Nd sub woofer located in the center position of the rear shelf.
- A surround amplifier positioned on the rear shelf.
- A VNC microphone positioned to the driver’s lower right.

The system incorporates proprietary processing technology from Bose, which makes two-channel audio information very rich and spacious. Base radio system features on the STS include dedicated presets for two drivers (up to 36 each) for AM, FM and XM Satellite Radio reception as well as the ability to seek across bands. The base system also includes expanded information display for XM, FM-RDS and CD MP3.

Six-disc in-dash DVD/CD changer
An optional factory-installed, in-dash six-disc DVD changer supports a variety of media formats and includes 5.1 channel surround sound. The system also incorporates dual media slots – one for entertainment and the other for DVD-based navigation – greatly reducing time changing media and ensuring full-time navigation capability.

Media formats supported by the DVD system include DVD audio, DVD video, CD audio and MP3. Media types supported are CD/DVD ROM and CD/DVD-R. DVD video can only be activated when the vehicle is in “park”.

Large infotainment display
When equipped with an uplevel infotainment package, the STS has an industry-largest 8-inch diagonal high-resolution full VGA infotainment display head with full touch screen and four-position tilt function.

The display head – which is positioned high in the center stack and is flush with the surface of the instrument panel – provides unmatched clarity enabled by 800-by-480 pixel resolution. A large viewable area (approximately 104-by-174 mm) is 20 percent larger than most current offerings.

The four position tilt-screen incorporates memory recall and offers 5-, 10-, and 15-degrees of tilt, enabling the driver to select the best viewing angle based on environmental conditions.

Enhanced DVD-based navigation system
The DVD-based navigation system available on the STS conducts route calculation 30 percent faster than current systems, displays freeway exit information (gas, restaurants, services) via expandable icons, and covers all roads and streets in the U.S. and Canada (nearly seven million miles) on a single map DVD. The system allows route planning to items stored in memory via voice commands and/or voice tags.

A broad range of location search options is available, making location selection more user friendly.

Cellular phone compatibility
The STS has cellular telephone accommodation for the factory-installed OnStar system and portable Bluetooth capable phones through the uplevel infotainment system, which enable hands-free operation, screen and voice dialing of phone numbers.

Enhanced voice recognition
An enhanced voice-recognition system on the STS offers continuous speech capability, multiple language support (English, French, Spanish, German, and Italian) and more than 150 voice commands, including those for infotainment and HVAC, among other functions.

05-04-04, 10:46 PM
Rear- or All-Wheel Drive Performance
255-hp 3.6L V6 VVT Engine
320-hp 4.6L V8 VVT Northstar Engine
Electronically Controlled Transmissions with Driver Shift Control

With delivery to showrooms scheduled for the fourth quarter of 2004, the all-new 2005 STS will be Cadillac’s first rear-wheel-drive entry in the luxury performance sedan segment in more than 25 years, and its first-ever all-wheel-drive sedan offering.

The STS will be equipped with two engine offerings, including a 320-horsepower 4.6-liter Northstar V-8 with 315 lb-ft of torque, or 3.6-liter 255-horsepower V-6 with 252 lb-ft of torque (estimated). The STS also will be available with all-wheel-drive (AWD) on vehicles equipped with the Northstar V-8.

The 4.6-liter Northstar is expected to deliver 0 to 60 performance at or less than 6.0 seconds. With the V-6 or AWD V-8, the STS is targeted to achieve 0 to 60 performance in under 7.0 seconds.

The V-6 and V-8 are mated to electronically controlled five-speed automatic transmissions – the Hydra-Matic 5L40-E is mated with the V-6, and the Hydra-Matic 5L50-E is mated with the V-8 and has both rear- and all-wheel-drive applications. The 5L50-E is designed to handle the V8’s torque, with a 25 percent torque capacity increase over that of the 5L40-E.

3.6-liter V-6 VVT engine
The 60-degree 3.6-liter V-6 is a highly refined, DOHC four-valves-per-cylinder engine with all-aluminum construction. The valve train configuration includes roller finger followers.

The adoption of fully variable valve timing for both intake and exhaust valves provides outstanding flexibility, fuel economy and emissions reduction. The four-cam variable valve timing is a key element in the V-6’s control strategy, which gives the engine a wide-ranging flexibility. For example, 90 percent of the 3.6L V-6’s peak torque is available across a remarkably broad operating range: from 1,600 rpm to 5,800 rpm. In addition, an electronically controlled throttle (ETC) effectively coordinates the driver’s intentions with the actions of the various control components.

Numerous design features were incorporated into the 3.6-liter engine to ensure it is one of the most advanced V-6 offerings in the world. These include:

- A dual-stage variable intake manifold (VIM). The VIM incorporates a switch in the manifold that automatically changes the plenum volume available for resonance tuning of the inlet flow path.
- Micro-hybrid engine control unit (ECU). The V-6’s ECU represents the latest in engine-management hardware, as well as the software that dictates every aspect of engine operation.
- Specially isolated cam covers incorporate an isolated gasket around the cover perimeter and radial lip seals at the tubes through which each spark is inserted.
- Three pressure-actuated piston-cooling oil-jet assemblies in the block each hold a pair of oil squirters that douse the underside of the piston and the surrounding cylinder wall with cooling oil. The benefit is piston temperatures resulting in more engine power.
- Polymer coating on the piston skirts helps the piston to track more smoothly and quietly in the bore.
- A new oil pump design, the product of a highly specialized analysis of pump flow, prevents noise caused by oil aeration.

Northstar V-8 engine
The 4.6-liter Northstar V-8 is a 90-degree DOHC four-valve-per-cylinder engine, with an aluminum block and cylinder heads and valve train with roller finger followers. The Northstar is equipped with a host of technologies, including:

- Four-cam continuously variable valve timing (VVT) for improved performance, refinement, economy and emissions.
- Electronic throttle control, providing additional driving refinement. This allows the engine control system to precisely and seamlessly tailor vehicle performance to the driver demands.
- Low restriction intake and exhaust manifolds and cylinder head ports designed to ensure optimum airflow and cylinder-to-cylinder distribution for maximum performance and emissions control.
- Close coupled catalytic converters, mounted directly adjacent to the exhaust manifolds. They reach effective operating temperature more rapidly after engine start.
- New air induction system, redesigned for enhanced capacity and noise attenuation. It features tuned resonators, additional resonators in the clean air duct and use of isolator pads in the clean air duct mounting.
- Powerful engine control module (ECM) and high-speed communication system dedicated to engine control. An extremely powerful, state-of-the-art ECM, with a 16-bit, 24 MHz dual microprocessor, high memory capacity, and a redundant “safety” processor backing up the ETC enables the Northstar engine to provide its advanced capabilities. A transmission control module (TCM) controls the transmission with inputs from the ECM.
- Polymer-coated pistons and cast-iron exhaust manifolds to further reduce noise, vibration and harshness.
- A forged steel crankshaft delivers additional stiffness for better noise, vibration and harshness performance; ensures the durability required of high specific output variants; and provides an extra degree of robustness.

Rear wheel drive
Rear-wheel-drive STS offerings (V-8 and V-6) offer an available limited slip differential, which mechanically limits wheel spin on all surfaces for improved vehicle performance during handling maneuvers.

Vehicles equipped with the V-6, which are only available in rear-wheel-drive, have a performance-optimized drive ratio of 3.42.

Vehicles equipped with the V-8 engine are available with three final drive ratios configurations; 2.73 for enhanced fuel economy; 3.23 for mid-sport performance; and a 3.42 for optimized performance. Exported vehicles are only equipped with the 3.42 final drive.

All wheel drive
Vehicles equipped with all wheel drive (V-8-equipped vehicles only) have a final drive ratio of 3.23. The system incorporates a 40/60 rear bias torque split to provide the STS with superior handling performance, acceleration, traction, and control for dry, wet, icy, and snowy road conditions. Its three open differential layout, coupled with four-wheel traction control, balances driving torque distribution to each wheel and minimizes wheel spin to optimize on-road performance.

Electronically controlled transmissions
The V-8 and V-6 are mated to electronically controlled five-speed automatic transmissions – the Hydra-Matic 5L50-E is mated with the V-8, and the Hydra-Matic 5L40-E with the V-6. Both transmissions incorporate Driver Shift Control (DSC) and Performance Algorithm Liftfoot (PAL) technologies.

Driver Shift Control enables the driver to switch from automatic to a clutchless five-speed high-performance manual transmission. Once the driver moves the gearshift lever into DSC mode, a quick tap is all that is required for smooth, crisp upshifts or downshifts within a selected range.

Performance Algorithm Liftfoot inhibits upshifts while maintaining engine braking following continuous performance driving. The transmission control module (TCM) monitors driver behavior to determine whether or not to enable this feature. For example, if the system detects a drop in vehicle speed prior to entering a turn or a lane change, up to two downshifts can occur to provide the driver with maximum vehicle performance.

05-04-04, 10:47 PM
- All-new Sigma-based Car is Highly Crafted Entry into Global Luxury Performance Sedan Market
- Cadillac Signature Design Vocabulary
- Rear-Wheel- or All-Wheel-Drive Performance
- Northstar 4.6-liter V-8 VVT or 3.6-liter V-6 VVT
- Dynamic Integrated Chassis Control Systems for Balanced Ride & Handling

The 2005 Cadillac STS is the luxury nameplate’s all-new luxury performance sedan. It has been designed, engineered and executed to deliver precision craftsmanship, outstanding performance, and sophisticated luxury in a distinctly American package.

Based on General Motors’ new rear-wheel-drive Sigma architecture, which also is the foundation for Cadillac’s entry-luxury CTS sedan, CTS V-series high-performance sedan, and SRX luxury performance utility – the STS is designed to compete head-on with world-renowned prestige sedans in markets around the globe.

“Our long-term goal for Cadillac is to become the Standard of the World once again,” said Mark LaNeve, general manager for Cadillac. “In order to succeed globally, we have to build vehicles that have outstanding performance, exceptional quality and reliability, and meet the demands of the most discerning car buyers. “The STS represents the latest step in that direction.”

From its Cadillac-signature bold exterior styling to its outstanding power and road capabilities, the STS is the product of unwavering attention to detail. More than 1,000 criteria points have been strictly adhered to throughout development of the vehicle. The result is outstanding fit and finish, overall harmony, refined performance and purposeful innovation.

“We feel very comfortable calling this a finely crafted car, but we also realize that’s the price of entry into this category,” said Jim Taylor, GM vehicle line executive, prestige vehicles. “The STS has simply been engineered to more than hold its own when matched against some of the best prestige luxury sedans in the world.”

While its overall shape brings a faster profile and more rake than its CTS sibling, it’s done so in the context of elegance and grace. Overall, the STS is 196-inches long, 72.6 inches wide and 57.6-inches high, making it the largest sedan offering in the Sigma-based family.

The exterior fit and finish on the STS is taking Cadillac to the next level of refinement and exemplifies the attention to detail seen throughout the vehicle. Body and exterior dimensions are precisely executed. Radii on major body components, such as the hood and decklid, are tight and contribute to its crisp exterior appearance. Doors-into-roof construction and a superplastic-formed aluminum decklid ensure a clean and refined exterior.

All interior gaps also achieve exceptionally close tolerances, enabling a tight, well-crafted appearance throughout. Eucalyptus wood and/or in-mold processed, dent and mar resistant aluminum trim is found on the steering wheel, center console, instrument panel, and door armrests.

Premium materials and fabrics are used throughout the interior. Dual-firmness Tuscany all-leather seats, available as heated and ventilated, are specially tanned for a softer feel. Spray-skinned urethane/natural grained surfaces on the door and instrument panel ensure an inviting, tactile touch, as do the headliner and interior pillars, which are soft backed and covered with a Monaco woven fabric.

In terms of performance, the STS will be available with a 255-horsepower 3.6L
V-6 in a rear-drive configuration, or the 320-horsepower Northstar 4.6L V-8 in both rear- and all-wheel-drive configurations. Both engines incorporate variable valve timing (VVT) and are mated to widely acclaimed 5-speed automatic transmissions with Driver Shift Control.

While the STS is true to Cadillac’s performance-oriented roots, a host of chassis refinements ensure that it hits the “sweet-spot” of ride and handling, resulting in a ride that keeps drivers fresh and comfortable without sacrificing the driving experience.

Road impacts and other harsh inputs are effectively absorbed and dissipated through ride-tuned tires, dampers, suspension components and bushings, as well as improved structure in body to chassis interfaces and additional refinements in the engine mounts.

Integrated chassis control technologies include a two-mode Magnetic Ride Control offering performance or touring selections, four-channel StabiliTrak, and an available high-precision ZF steering gear.

Technological appointments on the STS are plentiful, purposeful, and driver oriented. Such applications include an Easy Key system; Smart Remote Start system (not available in Europe or Russia); Adaptive Cruise Control (ACC); Intellibeam; re-configurable, four-color Head-Up Display (HUD); heated and ventilated seats; and heated steering wheel.

Of particular note is an available up-level infotainment system, which includes one of the industry’s first OEM-installed surround sound audio systems. The cabin is immersed with 15 speakers from Bose Corporation. The 5.1 Bose system also has an integrated six-disc CD/DVD changer and is capable of playing a broad array of formats including DVD-A, CD, and MP3. It includes an eight-inch VGA quality touch screen and advanced navigation. In addition, the system has Bluetooth capability, advanced voice recognition, and OnStar.

Like its Sigma-based siblings, the all-new STS will be built at GM’s state-of-the-art Lansing Grand River assembly center in Lansing, Mich., beginning in the summer of 2004.

The STS is expected to arrive in Cadillac showrooms in the fourth quarter of 2004. Beginning in 2005, the STS will be available in Europe, Japan, Russia, Middle East, South Korea, Taiwan and Israel.

10-24-04, 02:31 PM

what is the differential ratio of the limited slip rear end with 1SF? Is it 2.73 or 3.23?


10-24-04, 10:23 PM

what is the differential ratio of the limited slip rear end with 1SF? Is it 2.73 or 3.23?


I think the 2.73 only comes in the base V8 RWD.

10-25-04, 10:50 AM
I wonder what the EPA Fuel Economy numbers are with the 3.23. I would assume it will not make the 26 mpg hwy of the 2.73.

10-27-04, 05:20 PM
Not sure why this wasnt stickied!!!!!!

Done :)

12-15-04, 04:01 PM
I have a technical question, I've owned new cadillacs since 1993 I guess being Italian had something to do with it. Anyhow I have an 04 STS and an 03 SLS, my SLS just turned 40,000 miles but everytime I do an Oil change after 2000 miles my information gauge shows check oil. I've taken it to the cadillac dealership twice, they claim that the Northstar will burn 1 quart of oil every 2,000 miles. My response was a car over $50,000 dollars, should never burn oil for at least 100,000. Have any other member had this problem,or is GM hiding a flaw with the northstar engine.

Tony The Mongoose

Ed Of The Delta
12-18-04, 05:55 PM
Hi Tony,

I have been told that this is a charistic of this engine. In order to achieve the maximum performance out of some engines, they are “loosely fitted” and do use oil. Oil is cheap as long as its not draining out of the pan on to your driveway or garage. I use a high grade 10-30 in my SLS and change it (and filter) every 3K miles. I don’t use a synthetic in the Cad, but I do use Mobil 1 in my Chevy and change oil every 5K miles. Just keep an eye on the dip stick and only add a pint when it appears low–don’t over fill the crankcase. When I don’t see any oil on the dip stick, then I only add a little bit of oil. Don’t worry your car will probably go over a 1/4 million miles with a minimum of service. This is the 3rd Cad we have had. I have lost tract of the miles we have put on our cars and they were still running when we sold or traded them in–great shape. Ed