Re: Mondeo (III) Radio Code Question
- From: Geo <hw9j-s5hw@xxxxxxxxxxxxxxx>
- Date: Wed, 27 May 2009 12:56:37 GMT
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.
--
Geo
.
- Follow-Ups:
- Re: Mondeo (III) Radio Code Question
- From: Gordon H
- Re: Mondeo (III) Radio Code Question
- References:
- Mondeo (III) Radio Code Question
- From: Gordon H
- Re: Mondeo (III) Radio Code Question
- From: Mrcheerful
- Re: Mondeo (III) Radio Code Question
- From: Mrcheerful
- Re: Mondeo (III) Radio Code Question
- From: Harold Hill
- Re: Mondeo (III) Radio Code Question
- From: Geo
- Re: Mondeo (III) Radio Code Question
- From: Geo
- Re: Mondeo (III) Radio Code Question
- From: Chris Dugan
- Mondeo (III) Radio Code Question
- Prev by Date: Re: citroen c3 brakes
- Next by Date: Re: timing belt: ford puma
- Previous by thread: Re: Mondeo (III) Radio Code Question
- Next by thread: Re: Mondeo (III) Radio Code Question
- Index(es):
Relevant Pages
|
