Corvette V8-6.2L (2008)
Keyless Starting System: Technical Service Bulletins
Keyless Access System - Information/Operation
INFORMATION
Bulletin No.: 08-08-47-001
Date: March 13, 2008
Subject:
Keyless Access System Description, Operation and Possible Customer Concerns
Models:
2006-2008 Cadillac XLR, XLR-V
2004-2008 Chevrolet Corvette
Attention:
A copy of this bulletin may be given to your customer to assist you in explaining the proper operation features and possible symptoms of external
radio frequency interference on the Keyless Access System.
This bulletin is designed to offer some guidance on the expected and proper operation of the Keyless Access System. The Keyless Access System is
essentially both a "wireless" and portable technology that transmits and receives radio frequencies. These types of technologies whether being your cell
phone a wireless computer or other electronic devices are susceptible to external interference which may temporarily affect system performance. This
does not indicate that any defect in the system exists nor should any components be replaced for this type of concern. The information below will further
acquaint you and your customer with the identification of external interference and the back-ups available to easily restore expected system operation.
System Description
The Keyless Access System is a vehicle entry and starting system that allows you to operate the vehicle without removing the key fob
(transmitter/receiver) from a purse or pocket. With the vehicle locked the operator simply walks up to either door and squeezes the door handle switch. If
a known fob is recognized the door will unlock and open. After entering the vehicle (with a valid fob) the owner presses the brake pedal and pushes the
start button. When the fob is recognized the vehicle will start.
Explanation of Passive Entry
A passive entry event is one where the fob is automatically recognized when the door handle switch is activated (no buttons are pressed on fob to unlock
door prior to opening). Passive door unlocking can be configured in the DIC personalization menu so that just the driver door unlocks when a passive
entry event occurs or both doors unlock. When doing passive entry at the passenger door both doors will always unlock.
The vehicle has several antennas inside and outside the vehicle to detect if a fob is present. For example, when the driver door handle switch is pressed,
the vehicle first transmits a signal to any fob on the INSIDE of the vehicle to NOT respond. This is called a sleep command. The sleep command
temporarily instructs any fobs on the inside of the vehicle not to respond to the door antennas. The sleep command is used so that if you have someone
sitting in a locked vehicle with a valid fob, the fob inside the vehicle will not allow a door to open from the outside handle switch. After the sleep
command, the driver door antenna turns on so that it can detect a fob on the outside of the driver door. If one is found, the door is unlocked.
Possible Concerns
Whenever you are using a complex radio frequency system to judge proximity and location, there are certain limitations and variables that may arise.
