1990 Cadillac DeVille

1999 CADILLAC DEVILLE
128,000 MILES • V8 • FWD
Avatar
ELR3
  • MEMBER
  • 4 POSTS
I have a code of P1660 that came up on the meter at the local parts store. They did not know what the code meant. It means the Fan Relays are not allowing the cooling fans to come on but what I need to know is how to test the relays. Can someone help with that? Thanks
Aug 13, 2011 at 4:18 PM
Advertisement
Avatar
FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
You could bench test the relays by the use of jumper wires, a meter, and a power source(battery). On the side of the relay case is a layout of the circuitry with corresponding terminal numbers. About all you can do is power the control circuit, and use an ohmmeter to verify continuity through the relay switched contacts. Is there also an overheating concern that goes along with the fans code, and have you cleared the code to see if it returns?
Aug 14, 2011 at 5:31 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.