GM Bulletin No.: 13198
Date: June 2013

Service Bulletin

SERVICE UPDATE
SUBJECT:

Service Update for HVAC System Performance
Expires with Base Warranty

MODELS:

2013 Cadillac ATS (Inventory and Customer Vehicles)
2013 Cadillac XTS (Inventory Vehicles Only)

This service update includes vehicles in dealer inventory and customer vehicles that
return to the dealership for any reason. This bulletin will expire at the end of the involved
vehicle's New Vehicle Limited Warranty period.
PURPOSE
This bulletin provides a service procedure to reprogram the HVAC system control module on
certain 2013 model year Cadillac ATS and XTS vehicles to address multiple HVAC system
performance issues.
The service procedure provided in this bulletin should be completed as soon as possible
on involved ATS and XTS vehicles currently in dealer inventory. It should also be
completed on involved ATS customer vehicles that return to the dealer for any type of
service during the New Vehicle Limited Warranty coverage period.
VEHICLES INVOLVED
All involved vehicles are identified by VIN in the Global Warranty Management System –
Investigate Vehicle History Application. Dealership technicians should always check this site to
confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is
important to routinely use this tool to verify eligibility because not all similar vehicles may be
involved regardless of description or option content.
Additionally, a list of involved vehicles currently in dealer inventory is available on the “Service
Update Bulletin Information” link under the “Service” tab in GM GlobalConnect (US) or attached
to the GlobalConnect message (Canada) used to release this bulletin. Involved ATS vehicles
that return for service, for any reason, and are still covered under the vehicle's base warranty
should also be checked for vehicle eligibility.
PART INFORMATION
No parts are required.
Copyright 2013 General Motors. All Rights Reserved.

Page 2

June 2013

Bulletin No.: 13198

SERVICE PROCEDURE
Do not attempt to order the calibration number from GM Customer Care and Aftersales. The
calibration numbers required for this service procedure are programmed into control modules
via a Multiple Diagnostic Interface (MDI) with the calibration update. When using an MDI for
reprogramming, ensure that it is updated with the latest software version. Use TIS2WEB on or
after 6/28/13 to obtain the calibration. If you cannot access the calibration, call the Techline
Customer Support Center and it will be provided.
1. Verify that there is a battery charge of 12 to 15 volts. The battery must be able to maintain a
charge during programming. Only use an approved Midtronics® PSC 550 Battery Maintainer
(SPS Programming Support Tool EL-49642) or equivalent to maintain proper battery voltage
during programming.
2. Reprogram the HVAC Control Module. Refer to SI and Service Programming System (SPS)
documentation for programming instructions, if required.
2.1 Connect the MDI to the vehicle.
2.2 Select J2534 MDI and Reprogram ECU from the SPS Select Diagnostic Tool and
Programming Process screen.
2.3 Select K33 HVAC Control Module -- Programming from the SPS Supported Controllers
screen.
2.4 Follow the on-screen instructions.
3. Select the “Clear All DTCs” function on the SPS screen at the end of programming.
WARRANTY TRANSACTION INFORMATION
Submit a transaction using the table below. All transactions should be submitted as a ZFAT
transaction type, unless noted otherwise.
Labor Code
Description
9100082
Reprogram HVAC System Control Module

Labor
Time
0.3

DEALER PROGRAM RESPONSIBILITY
Whenever an ATS vehicle subject to this service update enters your vehicle inventory, or is in
your facility for service in the future, and the vehicle is still covered under the New Vehicle
Limited Warranty, you must take the steps necessary to be sure the service update correction
has been made before selling or releasing the vehicle. Dealers must take the steps necessary
to ensure that the service update correction has been made to all involved XTS vehicles in
dealer inventory before selling or dealer-trading the vehicle.

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

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