Owners manual, positive.
Depending on what type engine you have, the ignition module may be an integral part of the distributor cap.
The 1990 Chevy Celebrity engine is distributorless, the ignition is handled by a combination of the engine control module(computer) and the ignition control module. You did not mention which engine the car has. If your car has the 4 cylinder engine the ignition control module is below the intake manifold at the rear of the engine. You can follow the spark plug wires to it. The coils are mounted to the ignition control module. If your car has the V6 the ignition control module is near the starter and again you can follow the spark plug wires to it. Again the coils are mounted to the ignition control module.
Try the following link. You can get any vehicle diagram. The fees are reasonable. I bought the entire wiring diagram for my blazer. http://www.ahdol.com/
10 degrees
1-6-5-4-3-2
Ignition control device
The Ignition Control Module is on the top left hand side of the engine under the Ignition Coils.
wiil a 1999 blazer engine fit a 2002 blazer
what is the engine control switch feed wire on a distributer
Where can I find a engine schematic on line, for a 1999 Oldsmobile Intrigue 3.5 V6.
Which engine does your car have?
top right rear of engine.