Subaru Outback Wiring Diagram - GM Specific Models. 2002 Cadillac STS I looked under the hood and popped the cover off the fuse box. Under the lid is a diagram of the fuses with labels. One of them (#24 on my model car) said "DRL" on it. I pulled that fuse and voila!. Engine compartment fuse block. The fuse block is located in the engine compartment on the driver side of the vehicle. Chevrolet Express – fuse box – engine compartment fuse block. A: You might need to have the problem diagnosed properly at a dealer or auto repair shop. If the charcoal canister assembly will need to be replaced, as often is the case, the repair could run as high as $600 - $800 including diagnostic; the charcoal canister assembly is not a cheap part..