Re: Mondeo (III) Radio Code Question
- From: Albert T Cone <a.k.kirby@xxxxxxxxxxxx>
- Date: Wed, 03 Jun 2009 16:06:47 +0100
Geo wrote:
On Wed, 27 May 2009 00:06:21 +0000 (UTC), Chris Dugan <chrisdotdugan@xxxxxxxxxx>
wrote:
The EEPROM does not loose its contents; the security software in the radio detects the removal of the permanent 12v feed and goes into code prompt mode as soon as you apply power again.
Ok - I can see two ways of doing this
1. The radio detects loss of power and asks for a code and compares it with
eeprom contents once only after input. The input code is not stored.
2. The input code is stored in RAM and the radio checks the contents of the RAM
against the EEPROM on every switch-on.
In case 1, the EEPROM could theoretically "fail" and no one would notice until
such time as power was lost and input code requested.
In case 2, an EEPROM fault would cause the comparison to fail and the code would
be requested at switch-on.
In either case if the EEPROM remained faulty it would not be possible to input a
matching code.
But the fact that it accepts the code when it is entered means that the PROM/flash is fine. An intermittent break or short on the live feed is the most likely explanation. If it tends to happen when you hit potholes, I'd check the areas where the cabling passes through the bulkhead and clips. If it is completely random, or happens after a particular duration I'd look for areas which could be near a heat source. Intermittent faults are always a pain in the rear to track down...
.
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