2004 Chevrolet Cavalier Stereo Wiring Harness - AutoZone Equip cars, trucks & SUVs with 2004 Chevrolet Cavalier Stereo Wiring Harness from AutoZone. Get Yours Today! We have the best products at the right price. 2004 Chevrolet Cavalier Vehicle Wiring Chart and Diagram The engine harness is found next to the battery, below the radiator hose, just above the transaxle.  Non keyless cars, locks are 5wi and they are mastered from the passenger side switch. Keyless cars, locks are positive trigger .