General Information - All Models Buick LaCrosse I

US English/Metric Conversion

In order to convert English units to metric units, multiply the English units by the conversion factor shown in the conversion table.

In order to convert metric units to English units, divide the metric units by the conversion factor shown in the conversion table.

US English/Metric Conversion

Equivalents - Decimal and Metric

Equivalents - Decimal And Metric

Arrows and Symbols

This service manual uses various symbols in order to describe different service operations.

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Special Tools Ordering Information

The special service tools shown in this service manual that have product numbers beginning with J or BT are available for worldwide distribution from

OE Tool and Equipment Group

Kent-Moore

28635 Mound Road

Warren, MI, U.S.A. 48092-3499

Phone: 1-800-345-2233 or 586-574-2332

Monday through Friday

8:00 a.m.-7:00 P.M. Eastern Standard Time

Fax: 1-800-578-7375 or 586-578-7375

The TECH 2 scan tool and accessories can be purchased through

Dealer Equipment and Services

5775 Enterprise Dr.

Warren, MI, U.S.A. 48092-3463

Phone: 1-800-GM-TOOLS or 586-574-2332

Monday through Friday

8:00 a.m.-6:00 P.M. EST

Fax: 1-586-578-7205

Diagnostic Work Sheets

The GM Diagnostic Worksheet has been designed to improve communications between the service customer and the technician. The diagnostic worksheet can provide the technician with more information than the conventional repair order, since it is filled out by the service customer. Dealers in the US may contact Dealer Support Materials at 1-800-235-8521 and request Form Number DWS-01 to obtain these worksheets at no cost. Dealers may also access the DWD Store in Dealerworld and search for form DWS-01 or select Service Forms under Other Links and then select Diagnostic Worksheet (under Bulletin Information on use of Diagnostic Worksheet). Please limit your requests to a reasonable quantity.

Training

General Motors makes available automotive classroom training through the GM Training Centers and colleges.

Dealers

Course scheduling for GMCL Training Centres, remote and college locations is determined by Dealer Training Needs requested in TAMS (Technician Activity Monitoring System). Dealers register their Training Needs electronically via DCS. Training is then scheduled when sufficient Needs are received to support minimum classroom attendance. Dealers who have entered Needs will receive invitations via DCS (Dealer Communication System) to attend the requested training. Dealers having questions concerning the GMCL training process can directly contact GMCL Training Co-ordinators via toll free numbers 1-800-263-9555 (English) or 1-800-263-9770 (French).

Fleets

GMCL Fleet Training is accomplished through a separate training organization in Canada. Fleets can request training by faxing a document contained in a GMCL brochure (Fleet Training - Your Competitive Advantage) distributed to fleets (FAX # 905-831-1598). Further information concerning Fleet training can be obtained by calling toll free to 1-888-456-6660.

All US Dealers enroll through the GM Enrollment Calling Center (EEC). Each GM Dealer has an assigned consultant that calls the Service Manager each month. During this consultation call, the EEC processes enrollments requested by the Dealer Service Manager. Technicians should advise their Service Manager of the training they need, course names and course numbers for the classes the want to attend.

Fleets are to call their GM Training Center.

Non-GM Dealer Technician

Technician training for non-GM dealers is available through ACDelco. This training is for ACDelco customers employed in the automotive or truck service industry.

GM Training Center course availability and schedules can be obtained by calling 1-800-825-5886.

Clinics are offered through ACDelco Warehouse Distributors. Contact yours directly.

Correspondence courses are available on batteries, spark plugs and filters. These courses can be obtained through any ACDelco Representative or ACDelco Warehouse Distributor.

Vehicle Identification

The vehicle identification number (VIN) is a system of numbers and letters used to identify a vehicle.

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The VIN plate is the legal identifier of the vehicle. The VIN plate is located on the upper LH corner of the Instrument Panel and can be seen through the windshield from the outside of the vehicle

Vehicle Identification Number (VIN) System

Engine and Transmission Usage (Passenger Car Applications)

Engine And Transmission Usage (Passenger Car Applications)

Engine and Transmission Usage (G/H Van Applications)

Engine And Transmission Usage (G/H Van Applications)

Engine and Transmission Usage (Silverado and Sierra Applications)

Engine And Transmission Usage (Silverado and Sierra Applications)

Engine and Transmission Usage (C/K Chassis and Utility Applications)

Engine And Transmission Usage (C/K Chassis and Utility Applications)

Engine and Transmission Usage (Mid-Size Truck Applications)

Engine and Transmission Usage (Mid-Size Truck Applications)

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All engines and transmissions, as well as removable roof panels, are stamped or laser etched with a partial Vehicle Identification Number (VIN), which was derived from the complete VIN. A VIN derivative contains the following nine positions

1. Position 1 is the GM division identifier. 1 = Chevrolet
2. Position 2 is the model year code. 6 = 2006
3. Position 3 is the assembly plant code. 5 = Bowling Green, KY
4. Positions 4-9 contain the assembly plant sequential number for the vehicle.

A VIN derivative can be used to determine if a vehicle contains the original engine, transmission or removable roof panel, by matching the VIN derivative positions to their accompanying positions in the complete VIN

1. VIN derivative position 1 = VIN position 3
2. VIN derivative position 2 = VIN position 10
3. VIN derivative position 3 = VIN position 11
4. VIN derivative positions 4-9 = VIN positions 12-17

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The 6 speed manual transmission, the Borg Warner Tremec T-56 (RPO M12 and MM6), is stamped with a VIN derivative on the LH side of the transmission case.

Hydra-Matic 4L60-E Automatic Transmission

The 4 speed overdrive automatic transmission, the Hydra-Matic 4L60-E (RPO M30), is stamped or laser etched with a transmission identification number and a VIN derivative.

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The transmission identification (ID) number provides the transmission model and when it was built. The transmission ID number is located on the bottom of the case just rear of the oil pan.

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The VIN derivative will be placed in one of four locations illustrated.

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Plant And Shift Build Chart

N Truck

Plant And Shift Build Chart

S/T Pickup

Plant And Shift Build Chart

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All automatic transmissions have a metal identification (ID) nameplate (1) attached to the case exterior.

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The Hydra-Matic 4T45-E transmission has a metal identification nameplate (1) attached to the case exterior.

The information on the nameplate assists the technician in servicing the transmission and ordering replacement parts from a GM Parts Catalog.

Additional transmission identification information is provided on the Service Parts Identification label. This label shows the Regular Production Options (RPO) as well as the standard and mandatory options. This label is affixed to the inside of each vehicle at the assembly plant.

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An identification tag is attached to the front half of the transfer case. The tag provides the following information

1. Model number (1)
2. Manufacturer (2)
3. Part Number (3)
4. Serial Number (4)

The information on this tag is necessary for servicing the transfer case. If the tag is removed or becomes dislodged during service operations, keep the identification tag with the unit.

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The service parts identification label is located on the instrument panel storage compartment door in order to help service and parts personnel identify the vehicle's original parts and the vehicle's original options.

Metric Fasteners

This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch and strength.

A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the strength of the fastener material. A Posidrive® or Type 1A cross-recess identifies a metric cross-recess screw. For best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive® recess head screws.

GM Engineering Standards and North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example, the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and 1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches.

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The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric nuts are marked with a single digit strength identification number on the nut face.

The correct fasteners are available through GM SPO. Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other than the United States and may exhibit the following

1. Lower strength
2. No numbered head marking system
3. Wrong thread pitch

The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications

1. M6.0 X 1
2. M8 X 1.25
3. M10 X 1.5
4. M12 X 1.75
5. M14 X 2.00
6. M16 X 2.00

Prevailing Torque Fasteners

Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening.

All Metal Prevailing Torque Fasteners

These fasteners accomplish the thread interface by a designed distortion or deformation in the fastener.

Nylon Interface Prevailing Torque Fasteners

These fasteners accomplish the thread interface by the presence of a nylon material on the fastener threads.

Adhesive Coated Fasteners

These fasteners accomplish the thread interface by the presence of a thread-locking compound on the fastener threads. Refer to the appropriate repair procedure in order to determine if the fastener may be reused and the applicable thread-locking compound to apply to the fastener.

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A prevailing torque fastener may be reused ONLY if

1. The fastener and the fastener counterpart are clean and not damaged
2. There is no rust on the fastener
3. The fastener develops the specified minimum torque against its counterpart prior to the fastener seating

Metric Prevailing Torque Fastener Minimum Torque Development

English Prevailing Torque Fastener Minimum Torque Development

Tools Required

General purpose thread repair kits. These kits are available commercially.

Repair Procedure

1. Determine the size, the pitch and the depth of the damaged thread. If necessary, adjust the stop collars on the cutting tool and tap to the required depth.
2. Drill out the damaged threads. Clean out any chips.
3. Lubricate the tap with light engine oil. Tap the hole. Clean the threads.
4. Thread the thread insert onto the mandrel of the installer. Engage the tang of the insert onto the end of the mandrel.
5. Lubricate the insert with light engine oil (except when installing in aluminum) and install the insert.
6. If the tang of the insert does not break off when backing out the installer, break the tang off with a drift.

Abbreviations and Meanings

Abbreviations And Meanings

Registered and Non-Registered Trademarks

Listed below are Registered Trademarks (®) or Non-Registered Trademarks (™) which may appear in this service manual.

Registered And Non-Registered Trademarks