1999 Mercury Mystique troubleshoot

Tiny
MSS1970
  • MEMBER
  • 1999 MERCURY MYSTIQUE
  • 176,000 MILES
My keyless remote, my radio and the theft light all stopped at the same time and I would like to know how to fix it. It is a mercury mystique 1999. Please let me know what I need to do in order to fix my problem
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Sunday, August 18th, 2013 AT 6:28 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
The logical thing to do would be to check for a blown fuse either inside the car or under the hood.
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Monday, August 19th, 2013 AT 1:52 AM
Tiny
MSS1970
  • MEMBER
I did check the fuses and none seemed to be blown.I checked the radio fuse I didn't know what other fuses to look at
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Monday, August 19th, 2013 AT 1:22 PM
Tiny
CARADIODOC
  • EXPERT
There's not a simple answer to "how do I fix it". That's the easy part, once you know the cause. Diagnosing the cause is the hard part. In this case the assumption is all the dead circuits are related to a single cause which typically is a large fuse under the hood. Besides that there is all the wiring leading to and from the fuse box. You would need the manufacturer's wiring diagram and would have to know how to follow it. Unfortunately my computer won't let me into either of the online service manual companies and I gave up trying to figure out the problem. The Ford wiring diagram book is better anyway and relatively inexpensive.

One place you can start is by removing the radio and measuring the voltages on the plug to see which one is missing. One will have 12 volts all the time for the radio memory, and one will have 12 volts only when the ignition switch is turned on. The radio is usually easier to access than the computers and knowing which power circuit is dead will tell you which wire to follow back in the wiring diagram.
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Monday, August 19th, 2013 AT 1:58 PM

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