1990 Cadillac Seville STS Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Cadillac Seville STS
Verified by mechanics, reported by drivers like you
1990 Cadillac Seville STS ProblemsCar Won't Start Because of Anti-Theft System That Uses Raised-Chip Key
Problems with anti-theft systems using the raised-chip key can prevent the car from starting. The wires in the steering column to the ignition lock cylinder tend to break. The key and ignition lock cylinder should be replaced to correct this condition.
The high-pressure power steering lines are known to leak.
This powertrain control module (PCM) may develop a fault with its electrical ground location at the front of the engine block near the starter motor.