Electrical - Aftermarket Devices May Interfere With OnStar(R)
INFORMATION
Bulletin No.: 08-08-46-004A
Date: November 30, 2012
Subject: (R)Information on Aftermarket Device Interference with OnStar Diagnostic Services
Models:
2013 and Prior GM Passenger Cars and Trucks
Equipped with OnStar(R) (RPO UE1)
Supercede:
This bulletin is being revised to add the 2010-2013 model years. Please discard Corporate Bulletin Number 08-08-46-004 (Section 08 - Body and
Accessories).
This bulletin is being issued to provide dealer service personnel with information regarding aftermarket devices connected to the Diagnostic Link
Connector (DLC) and the impact to OnStar(R) diagnostic probes and Vehicle Diagnostic e-mails.
Certain aftermarket devices, when connected to the Diagnostic Link Connector, such as, but not limited to, Scan Tools, Trip Computers, Fuel
Economy Analyzers and Insurance Tracking Devices, interfere with OnStar's ability to perform a diagnostic probe when requested (via a blue
button call) by a subscriber. These devices also prohibit the ability to gather diagnostic and tire pressure data for a subscriber's scheduled OnStar(R)
Vehicle Diagnostic (OVD) e-mail.
These aftermarket devices utilize the Vehicle's serial data bus to perform data requests and/or information gathering. When these devices are
requesting data, OnStar(R) is designed not to interfere with any data request being made by these devices as required by OBD II regulations.
The OnStar(R) advisor is unable to definitively detect the presence of these devices and will only be able to inform the caller or requester of the
unsuccessful or incomplete probe and may in some cases refer the subscriber/requester to take the vehicle to a dealer for diagnosis of the concern.
When performing a diagnostic check for an unsuccessful or incomplete OnStar(R) diagnostic probe, or for concerns regarding completeness of the
OnStar(R) Vehicle Diagnostic (OVD) e-mail, verify that an aftermarket device was not present at the time of the requested probe. Regarding the
OVD e-mail, if an aftermarket device is interfering (including a Scan Tool of any type), the e-mail will consistently display a "yellow" indication in
diagnostics section for all vehicle systems except the OnStar(R) System and Tire Pressure data (not available on all vehicles) will not be displayed
(i.e. section is collapsed). Successful diagnostic probes and complete OVD e-mails will resume following the removal or disconnecting of the
off-board device.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 3
