Keyless Entry - Remote(s) Are Inoperative
TIE Technical JournalTitle P1X MY 2008/2009 renotes inop on Non-keyless vehicles
Ref No US19752.13 en-GB
Issuer -
Partner 3 US 7510 Volvo Cars North America
Func Group 3669
Func Desc miscellaneous
Status Released
Status Date 2010-12-20
Issue Date 2010-12-20
Reference
Attachment
Vehicle Type
CSC
DTC
Text
***************See attachment for more information****************
NOTE!
THIS DOCUMENT SUPERSEDES THE PREVIOUS VERSION OF RETAILER TECHNICAL JOURNAL 19752 DATED 01-28-2010.
Changes to this document are:
CSC "XI" added
DESCRIPTION:
All of the functions on one or more remotes may become completely inoperative.
For example;
^ Approach light
^ Panic alarm
^ Tailgate unlock
^ Lock
^ Unlock
Once the symptom is present it is permanent. In most cases only one remote is affected but it is possible although rare for both remotes to be inoperative at the same time. Analysis has revealed the root cause as a random synchronization (SI) counter error.
The SI counter is an electronic security feature to prevent someone from recording the encrypted message sent by the remote and playing it back to open the car. The counter should increase in the CEM (Central electronic module) and the KIR (key integrated remote) at the same time a remote button is depressed.
The SI counter contained in the KIR could at random increase or decrease above or below the limit allowed. This will cause the remote(s) to become inoperative until the counter is reset.