For 1990-2009 cars

The diagnosis and repair procedures in a GM Service Manual contain both general and specific Cautions, Notices, and 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 . Cautions, Notices, and 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 caution or notice that appears in this service category is referenced from the individual service categories.

### CAUTION Defined

When encountering a CAUTION, you will be asked to take a necessary action or not to take a prohibited action. If a CAUTION 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

• | Serious bodily injury to the driver and/or passenger(s) of the vehicle, if the vehicle has been improperly repaired

### NOTICE Defined

Notices call special attention to a necessary action or to a prohibited action. If a NOTICE 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

### IMPORTANT Defined

IMPORTANT statements emphasize a necessary characteristic of a diagnostic or repair procedure. 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