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08-08-46-004A Information on Aftermarket Device Interference with OnStar Diagnostic Services - (Nov 30 2012)

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Subject:Information on Aftermarket Device Interference with OnStar® Diagnostic Services

#08-08-46-004A: Information on Aftermarket Device Interference with OnStar Diagnostic Services - (Nov 30, 2012)

Models: 2013 and Prior GM Passenger Cars and Trucks
Equipped with OnStar® (RPO UE1)

This bulletin is being revised to add the 2010-2013 model years. Please discard CorporateBulletin Number 08-08-46-004 (Section 08 – Body and Accessories).

This bulletin is being issued to provide dealer service personnel with informationregarding aftermarket devices connected to the Diagnostic Link Connector (DLC) andthe impact to OnStar® diagnostic probes and Vehicle Diagnostic e-mails.

Certain aftermarket devices, when connected to the Diagnostic Link Connector, suchas, but not limited to, Scan Tools, Trip Computers, Fuel Economy Analyzers and InsuranceTracking Devices, interfere with OnStar's ability to perform a diagnostic probe whenrequested (via a blue button call) by a subscriber. These devices also prohibit theability to gather diagnostic and tire pressure data for a subscriber's scheduled OnStar®VehicleDiagnostic (OVD) e-mail.

These aftermarket devices utilize the Vehicle's serial data bus to perform data requestsand/or information gathering. When these devices are requesting data, OnStar® is designednot to interfere with any data request being made by these devices as required byOBD II regulations.

The OnStar® advisor is unable to definitively detect the presence of these devicesand will only be able to inform the caller or requester of the unsuccessful or incompleteprobe and may in some cases refer the subscriber/requester to take the vehicle toa dealer for diagnosis of the concern.

When performing a diagnostic check for an unsuccessful or incomplete OnStar® diagnosticprobe, or for concerns regarding completeness of the OnStar® Vehicle Diagnostic (OVD)e-mail, verify that an aftermarket device was not present at the time of the requestedprobe. Regarding the OVD e-mail, if an aftermarket device is interfering (includinga Scan Tool of any type), the e-mail will consistently display a “yellow” indicationin diagnosticssection for all vehicle systems except the OnStar® System and Tire Pressure data (notavailable on all vehicles) will not be displayed (i.e. section is collapsed). Successfuldiagnostic probes and complete OVD e-mails will resume following the removal or disconnectingof the off-board device.

GM bulletins are intended for use by professional technicians,NOT a "do-it-yourselfer".  They are written to inform thesetechnicians of conditions that may occur on some vehicles, or toprovide information that could assist in the proper service of avehicle.  Properly trained technicians have the equipment,tools, safety instructions, and know-how to do a job properly andsafely.  If a condition is described, DO NOT assume that thebulletin applies to your vehicle, or that your vehicle will havethat condition.  See your GM dealer for information on whetheryour vehicle may benefit from the information.

#08-08-46-004A: Information on Aftermarket Device Interference with OnStar Diagnostic Services - (Nov 30, 2012)

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