Pontiac 2003 Bonneville Owner's Manual page 284

Then, without shutting off the engine, follow these steps:
The transaxle fluid dipstick
top is a round, red loop
and is located next to the
brake master cylinder
behind the engine block.
See Engine Compartment
Overview on page 5-14
for more information
on location.
3.
1. Pull out the dipstick and wipe it with a clean rag or
2. Push it back in all the way, wait three seconds and
paper towel.
then pull it back out again.
4.
Check both sides of the dipstick, and read
the lower level. The fluid level must be in the
cross-hatched area.
If the fluid level is in the acceptable range, push the
dipstick back in all the way.
5-25