Definition of Danger, Warning, Caution, and Note
The diagnosis and repair procedures in a GM Service Manual contain both general and specific Dangers, Warnings, Cautions, Notes or Importants. GM is dedicated to the presentation of service information that helps the technician to diagnose and repair the systems necessary for the proper operation of the vehicle, however, certain procedures may present a hazard to the technician if they are not followed in the recommended manner. Dangers, Warnings, Cautions and Notes or Importants are elements designed to prevent these hazards, however, not all hazards can be foreseen. This information is placed at strategic locations within the service manual. This information is designed to prevent the following from occurring
- Serious bodily injury or death to the technician
- Damage to the vehicle
- Unnecessary vehicle repairs
- Unnecessary component replacement
- Improper repair or replacement of vehicle components.
- Any warning or caution that appears in this service category is referenced from the individual service categories.
DANGER Defined
When encountering a DANGER, you will be asked to take a necessary action or not to take a prohibited action. If a DANGER is not heeded, the following consequences may occur
- Serious bodily injury or death to the technician
- Serious bodily injury or death to other technicians in the workplace area
WARNING Defined
When encountering a WARNING, you will be asked to take a necessary action or not to take a prohibited action. If a WARNING is not heeded, the following consequences may occur
- Serious bodily injury to the technician
- Serious bodily injury to other technicians in the workplace area
- Serious bodily injury to the driver and/or passenger(s) of the vehicle, if the vehicle has been improperly repaired
CAUTION Defined
CAUTIONS call special attention to a necessary action or to a prohibited action. If a CAUTION is not heeded, the following consequences may occur
- Damage to the vehicle
- Unnecessary vehicle repairs
- Unnecessary component replacement
- Improper operation or performance of the system or component under repair
- Damage to any systems or components which are dependent upon the proper operation of the system or component under repair
- Improper operation or performance of any systems or components which are dependent upon the proper operation or performance of the system or component under repair
- Damage to fasteners, basic tools, or special tools
- The leakage of coolant, lubricant, or other vital fluids
NOTE or IMPORTANT Defined
NOTE and IMPORTANT statements emphasize a necessary characteristic of a diagnostic or repair procedure. NOTE or IMPORTANT statements are designed to do the following
- Clarify a procedure
- Present additional information for accomplishing a procedure
- Give insight into the reason or reasons for performing a procedure in the manner recommended
- Present information that will help to accomplish a procedure in a more effective manner
- Present information that gives the technician the benefit of past experience in accomplishing a procedure with greater ease
Approved Equipment for Collision Repair Warning
| WARNING | To avoid personal injury when exposed to welding flashes or to galvanized (Zinc Oxide) metal toxic fumes while grinding/cutting on any type of metal or sheet molded compound, you must work in a properly ventilated area, wearing an approved respirator, eye protection, earplugs, welding gloves, and protective clothing. |
Assistant Driving Warning
| WARNING | An assistant should drive the vehicle while the technician checks for the location of the reported condition. Otherwise, personal injury could result. |
Battery Disconnect Warning
| WARNING | Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components. For Vehicles equipped with OnStar® (UE1) with Back Up Battery: The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced. |
Brake Dust Warning
| WARNING | Avoid taking the following actions when you service wheel brake parts: Do not grind brake linings. Do not sand brake linings. Do not clean wheel brake parts with a dry brush or with compressed air. Some models or aftermarket brake parts may contain asbestos fibers which can become airborne in dust. Breathing dust with asbestos fibers may cause serious bodily harm. Use a water-dampened cloth in order to remove any dust on brake parts. Equipment is available commercially in order to perform this washing function. These wet methods prevent fibers from becoming airborne. |
Brake Fluid Irritant Warning
| WARNING | Brake fluid may irritate eyes and skin. In case of contact, take the following actions: Eye contact-rinse thoroughly with water. Skin contact-wash with soap and water. If ingested-consult a physician immediately. |
Brake Fluid Warning
| WARNING | Use only Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container. Do not use fluid from an open container that may be contaminated with water. Improper or contaminated fluid could result in damage to components, or loss of braking, with possible injury. |
Camshaft Position Actuator Removal and Installation Warning
| WARNING | Do not push or pull on the reluctor wheel of the camshaft position (CMP) actuator during removal or installation. The reluctor wheel is retained to the front of the CMP actuator by 3 roll pins. Pushing or pulling on the wheel may dislodge the wheel from the front of the actuator. The actuator return spring is under tension and may rotate the dislodged reluctor wheel, causing personal injury. |
Collision Sectioning Warning
| WARNING | Sectioning should be performed only in the recommended areas. Failure to do so may compromise the structural integrity of the vehicle and cause personal injury if the vehicle is in a collision. |
Cracked Window Warning
| WARNING | If a window is cracked but still intact, crisscross the window with masking tape in order to reduce the risk of damage or personal injury. |
Differential Case Removal Warning
| WARNING | To prevent personal injury and/or component damage, support the differential case when removing the case from the axle housing. If the case is not supported, the differential case could fall and cause personal injury or damage to the differential case. |
Exhaust Service Warning
| WARNING | In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool. |
Eye Protection Warning
| WARNING | Approved safety glasses and gloves should be worn when performing this procedure to reduce the chance of personal injury. |
Foam Sound Deadeners Warning
| WARNING | Foam sound deadeners must be removed from areas within 152.4 mm (6 in) of where flame is to be used for body repairs. When reinstalling foam sound deadeners, avoid inhaling fumes as bodily injury may result. |
Fuel and Evaporative Emission Pipe Warning
| WARNING | In order to reduce the risk of fire and personal injury observe the following items: Replace all nylon fuel pipes that are nicked, scratched or damaged during installation, do not attempt to repair the sections of the nylon fuel pipes Do not hammer directly on the fuel harness body clips when installing new fuel pipes. Damage to the nylon pipes may result in a fuel leak. Always cover nylon vapor pipes with a wet towel before using a torch near them. Also, never expose the vehicle to temperatures higher than 115°C (239°F) for more than one hour, or more than 90°C (194°F) for any extended period. Apply a few drops of clean engine oil to the male pipe ends before connecting fuel pipe fittings. This will ensure proper reconnection and prevent a possible fuel leak. (During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated.) |
Fuel Pipe Fitting Warning
| WARNING | Always apply a few drops of clean engine oil to the male pipe ends before connecting the fuel pipe fittings in order to reduce the risk of fire and personal injury. This will ensure proper reconnection and prevent a possible fuel leak. During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated. |
Fuel Rail Stop Bracket Installation Warning
| WARNING | The fuel rail stop bracket must be installed onto the engine assembly. The stop bracket serves as a protective shield for the fuel rail in the event of a vehicle frontal crash. If the fuel rail stop bracket is not installed and the vehicle is involved in a frontal crash, fuel could be sprayed possibly causing a fire and personal injury from burns. |
Gasoline/Gasoline Vapors Warning
| WARNING | Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. |
Glass and Sheet Metal Handling Warning
| WARNING | When working with any type of glass or sheet metal with exposed or rough edges, wear approved safety glasses and gloves in order to reduce the chance of personal injury. |
Halogen Bulb Warning
| WARNING | Halogen bulbs contain gas under pressure. Handling a bulb improperly could cause it to shatter into flying glass fragments. To help avoid personal injury: Turn off the lamp switch and allow the bulb to cool before changing the bulb. Leave the lamp switch OFF until the bulb change is complete. Always wear eye protection when changing a halogen bulb. Handle the bulb only by its base. Avoid touching the glass. Keep dirt and moisture off the bulb. Properly dispose of the used bulb. Keep halogen bulbs out of the reach of children. |
Hot Exhaust System Warning
| WARNING | While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system. |
Moving Parts and Hot Surfaces Warning
| WARNING | Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury. |
Protective Goggles and Glove Warning
| WARNING | Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury. |
Relieving Fuel Pressure Warning
| WARNING | Remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete. |
Road Test Warning
| WARNING | Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage. |
Safety Glasses and Compressed Air Warning
| WARNING | Wear safety glasses when using compressed air in order to prevent eye injury. |
Safety Glasses Warning
| WARNING | Wear safety glasses in order to avoid eye damage. |
SIR Inflator Module Handling and Storage Warning
| WARNING | When carrying an undeployed inflator module: Do not carry the inflator module by the wires or connector. Make sure the air bag opening points away from you. When storing an undeployed inflator module: Make sure the air bag opening points away from the surface on which the inflator module rests. Provide free space for the air bag to expand in case of an accidental deployment. When storing a steering column, do not rest the column with the air bag opening facing down and the column vertical. Lay the column on its side. Failure to observe these guidelines may result in personal injury. |
SIR Warning
| WARNING | This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions: Air bag deployment Personal injury Unnecessary SIR system repairs In order to avoid the above conditions, observe the following guidelines: Refer to COMPONENT LOCATOR in order to determine if you are performing service on or near the SIR components or the SIR wiring. If you are performing service on or near the SIR components or the SIR wiring, disable the SIR system. Refer to SIR DISABLING AND ENABLING . |
Valve Springs Can Be Tightly Compressed Warning
| WARNING | Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result. |
Window Retention Warning
| WARNING | When replacing stationary windows, use Urethane Adhesive Kit GM P/N 12346392 (Canadian P/N 10952983), or a urethane adhesive system meeting GM Specification GM3651G, to maintain original installation integrity. Failure to use the urethane adhesive kit will result in poor retention of the window which may allow unrestrained occupants to be ejected from the vehicle resulting in personal injury. |
Work Stall Test Warning
| WARNING | One or more of the following guidelines may apply when performing specific required tests in the work stall: When a test requires spinning the drive wheels with the vehicle jacked up, adhere to the following precautions: Do not exceed 56 km/h (35 mph) when spinning one drive wheel with the other drive wheel stopped. This limit is necessary because the speedometer indicates only one-half the actual vehicle speed under these conditions. Personal injury may result from excessive wheel spinning. If all of the drive wheels are spinning at the same speed, do not exceed 112 km/h (70 mph). Personal injury may result from excessive wheel spinning. All persons should stay clear of the rotating components and the balance weight areas in order to avoid possible personal injury. When running an engine in the repair stall for an extended period of time, use care not to overheat the engine and the transmission. When a test requires jacking up the vehicle and running with the wheels and brake rotors removed, adhere to the following precautions: Support the suspension at normal ride height. Do not apply the brake with the brake rotors removed. Do not place the transmission in PARK with the drive axles spinning. Turn Off the ignition in order to stop the powertrain components from spinning. When running an engine in the work stall, use the exhaust removal system to prevent breathing dangerous gases. |
Belt Dressing Caution
| CAUTION | Do not use belt dressing on the drive belt. Belt dressing causes the breakdown of the composition of the drive belt. Failure to follow this recommendation will damage the drive belt. |
Brake Caliper Caution
| CAUTION | Support the caliper with a piece of wire to prevent damage to the brake line. |
Brake Fluid Effects on Paint and Electrical Components Caution
| CAUTION | Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush the area with water. If any brake fluid comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away the fluid. |
Clearcoat/Ultraviolet Screeners Caution
| CAUTION | Removing more than 0.5 mils of the clearcoat can result in early paint failure. The clearcoat contains ultraviolet screeners. Do not finesse sand more than what is required to remove the defect. |
Component Fastener Tightening Caution
| CAUTION | Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage. |
Damage to Fuel Tank Straps Caution
| CAUTION | Do not bend the fuel tank straps. Bending the fuel tank straps may damage the straps. |
Differential Housing Cover and Gasket Removal Caution
| CAUTION | When removing the differential case from the axle housing, do not damage the cover gasket surface. If the cover gasket surface is damaged, lubricant may leak from the axle and cause premature failure of the axle assembly. |
Excessive Force and Oxygen Sensor Caution
| CAUTION | The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe. |
Exterior Trim Emblem Removal Caution
| CAUTION | Use a plastic, flat-bladed tool to prevent paint damage when removing an emblem/name plate. |
Fastener Caution
| CAUTION | Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Do not use paints, lubricants, or corrosion inhibitors on fasteners, or fastener joint surfaces, unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. When using fasteners that are threaded directly into plastic, use extreme care not to strip the mating plastic part(s). Use hand tools only, and do not use any kind of impact or power tools. Fastener should be hand tightened, fully seated, and not stripped. |
Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution
| CAUTION | Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system: The fuel pipe connections The hose connections The areas surrounding the connections |
Heated Oxygen and Oxygen Sensor Caution
| CAUTION | Do not remove the pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or the connector will affect sensor operation. Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged. This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance. The following guidelines should be used when servicing the heated oxygen sensor: Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance. Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. Ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire. Do not remove or defeat the oxygen sensor ground wire, where applicable. Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance. Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit. Under no circumstances should repairs be soldered since this could result in the air reference being obstructed. |
Heated Oxygen Sensor Resistance Learn Reset Caution
| CAUTION | When replacing the HO2S perform the following: A code clear with a scan tool, regardless of whether or not a DTC is set HO2S heater resistance learn reset with a scan tool, where available Perform the above in order to reset the HO2S resistance learned value and avoid possible HO2S failure. |
Machined Surface Damage Caution
| CAUTION | Do not nick, scratch or damage the sealing surface. The sealing surface is a machined surface. Damage to the machined surface can cause leakage. |
Pin Reuse Caution
| CAUTION | Discard the pin. Replace with a NEW pin. Using an old pin may result in transmission damage. |
Pinion Flange/Yoke Installation Caution
| CAUTION | Do not hammer the pinion flange/yoke onto the pinion shaft. Pinion components may be damaged if the pinion flange/yoke is hammered onto the pinion shaft. |
Power Steering Hose Disconnected Caution
| CAUTION | Do not start the vehicle with any power steering gear inlet or outlet hoses disconnected. When disconnected, plug or cap all openings of components. Failure to do so could result in contamination or loss of power steering fluid and damage to the system. |
Retaining Ring Reuse Caution
| CAUTION | Do not reuse the retaining ring. Install a NEW retaining ring. Reusing the old retaining ring may cause damage to the clutch assembly. |
Ring Gear Removal Caution
| CAUTION | Do not pry the ring gear from the differential case. Prying the ring gear from the differential case may cause damage to the ring gear and/or the differential case. |
Sealant Caution
| CAUTION | Do not allow the RTV sealant to enter any blind threaded hole. RTV sealant that is allowed to enter a blind threaded hole can cause hydraulic lock of the fastener when the fastener is tightened. Hydraulic lock of a fastener can lead to damage to the fastener and/or the components. Hydraulic lock of a fastener can also prevent the proper clamping loads to be obtained when the fastener is tightened. Improper clamping loads can prevent proper sealing of the components allowing leakage to occur. Preventing proper fastener tightening can allow the components to loosen or separate leading to extensive engine damage. |
Seal Reuse Caution
| CAUTION | Do not reuse the seals. Replace with NEW seals. Reusing old seals may cause transmission damage. |
Silicon Contamination of Heated Oxygen Sensors Caution
| CAUTION | Contamination of the oxygen sensor can result from the use of an inappropriate RTV sealant (not oxygen sensor safe) or excessive engine coolant or oil consumption. Remove the HO2S and visually inspect the portion of the sensor exposed to the exhaust stream in order to check for contamination. If contaminated, the portion of the sensor exposed to the exhaust stream will have a white powdery coating. Silicon contamination causes a high but false HO2S signal voltage (rich exhaust indication). The control module will then reduce the amount of fuel delivered to the engine, causing a severe driveability problem. Eliminate the source of contamination before replacing the oxygen sensor. |
Steering Wheel in the Full Turn Position Caution
| CAUTION | Do not hold the steering wheel in the full turn position longer than 5 seconds, as damage to the steering pump may result. |
Test Probe Caution
| CAUTION | Do not insert test equipment probes (DMM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the EL-38125-580 GM Approved Terminal Release Tool Kit in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals. When using the EL-38125-580 GM Approved Terminal Release Tool Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the EL-38125-580 GM Approved Terminal Release Tool Kit label on the inside of the EL-38125-580 GM Approved Terminal Release Tool Kit for the correct adapter along with the connector end view for terminal size. |
Three-Way Catalytic Converter Damage Caution
| CAUTION | In order to avoid damaging the replacement three-way catalytic converter, correct the engine misfire or mechanical fault before replacing the three-way catalytic converter. |
Transfer Case Seal Removal Caution
| CAUTION | Do not damage the sealing surfaces of the transfer cases or the shafts when prying the seals for removal. Damaging the sealing surface may cause leakage or require replacement of the damaged component. |
