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OnStar(R) - Loss of GPS Signal/Hands Free Issues
Emergency Contact Module: Customer InterestOnStar(R) - Loss of GPS Signal/Hands Free Issues
Bulletin No.: 02-08-46-007C
Date: November 19, 2007
INFORMATION
Subject:Information on OnStar(R) System - Possible Loss of GPS Signal, Hands-Free Calling Minutes Expire Prematurely and/or Inability to Add Hands-FreeCalling Minutes
Models:2001-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn)2003-2008 HUMMER H22006-2008 HUMMER H32005-2008 Saab 9-7X
with OnStar(R) System (RPO UE1)
Supercede:
This bulletin is being revised to add the 2008 model year, warranty information and to provide GPS signal recovery steps (under Dealer Action heading)to do PRIOR to determining if the VIU/VCIM needs replacement. Please discard Corporate Bulletin Number 02-08-46-007B (Section 08 - Body &Accessories).
If the vehicle currently has analog-upgradable OnStar(R) hardware, then the customer should be made aware of the digital upgrade program per the latestversion of Service Bulletin # 05-08-46-006. Any analog OnStar system that is not upgraded prior to the end of 2007 will be deactivated due to theupcoming phase-out of the analog cellular network in the U.S. and Canada. If the vehicle has recently been upgraded or has had a service replacementunit installed, this bulletin may not be applicable.
Certain 2001-2008 model year vehicles equipped with OnStar(R) may exhibit a condition with the Global Positioning System (GPS) that causesinaccuracies in the GPS clock. The GPS system is internal to the OnStar(R) Vehicle Interface Unit (VIU) or the Vehicle Communication InterfaceModule (VCIM). This inaccuracy can result in a symptom where the OnStar(R) Call Center is unable to obtain an accurate GPS signal, hands-FreeCalling minutes expire prematurely and/or the inability to add Hands-Free calling minutes.
Customer Notification
OnStar(R) will notify the customer by mail with instructions to contact their dealership service department.
Dealer Action
Not all vehicles will require VIU/VCIM replacement.
The GPS signal in some vehicles may be recoverable. To determine if the signal is recoverable, simply connect the Tech2(R) and using the GPSinformation data display option, observe the GPS date and time. If the date/time stamps are equal to a date approximately 19 years in the future, the GPSclock has exceeded its capacity and the VIU/VCIM will need to be replaced. If the date/time stamp is in the past or near future, the GPS clock has simplygenerated an inaccurate value and may be recoverable by performing the following power-up reset.
To initiate a power-up reset, battery voltage (batt. +) must be removed from the VIU/VCIM. The preferred methods, in order, of initiating the reset areoutlined below.