Bulletin No.:

Service Bulletin

Date:

20-NA-001
January, 2020

TECHNICAL
Subject:

Low Volume Of Air Delivery Through The Defrost Vents During Vehicle Remote Start
This bulletin replaces PIT5656. Please discard PIT5656.

Brand:

Model:

Cadillac

XT4

Model Year:

VIN:

from

to

2019

2019

Involved Region or Country

from

Engine:

Transmission:

All

All

to

North America, N.A. Export Regions

Additional Options (RPOs)
Condition

Some customers may comment that under certain conditions when using the remote
vehicle start the front windshield will not defrost.

Cause

The cause of the condition may be an issue with the HVAC Module software

Correction

Update HVAC module with the latest calibration.

Service Procedure

•

Caution: Before downloading the update files, be sure
the computer is connected to the internet through a
network cable (hardwired). DO NOT DOWNLOAD or
install the files wirelessly. If there is an interruption
during programming, programming failure or control
module damage may occur.
Note: Carefully read and follow the instructions below.
•

Ensure the programming tool is equipped with the
latest software and is securely connected to the
data link connector. If there is an interruption
during programming, programming failure or
control module damage may occur.

•

•

Copyright 2020 General Motors LLC. All Rights Reserved.

Stable battery voltage is critical during
programming. Any fluctuation, spiking, over
voltage or loss of voltage will interrupt
programming. Install a GM Authorized
Programming Support Tool to maintain system
voltage. Refer to www.gmdesolutions.com for
further information. If not available, connect a fully
charged 12 V jumper or booster pack
disconnected from the AC voltage supply. DO
NOT connect a battery charger.
Turn OFF or disable systems that may put a load
on the vehicles battery such as; interior lights,
exterior lights (including daytime running lights),
HVAC, radio, etc.
Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.

Page 2

January, 2020

Bulletin No.: 20-NA-001

5431207

Note: If the Same Calibration/Software Warning is
noted on the SPS screen, select OK and follow screen
instructions. After a successful programming event, the
WCC is located in the Service Programming System
dialogue box of the SPS Summary screen. No further
action is required. Refer to the Warranty section of the
bulletin.

1. Reprogram the HVAC Control Module. Refer to
K33 HVAC Control Module: Programming and
Setup in SI.

Bulletin No.: 20-NA-001

January, 2020

Page 3

5431209

Note: To avoid warranty transaction rejections, you
MUST record the warranty claim code provided on the
SPS Warranty Claim Code (WCC) screen on the job
card. Refer to callout 1 above for the location of the
WCC on the SPS screen.
2. Record SPS Warranty Claim Code on job card for
warranty transaction submission.

Parts Information
No parts are required for this repair.

Warranty Information
For vehicles repaired under warranty, use:
Labor Operation

Description

Labor Time

2811085*

HVAC Control Module Reprogramming with SPS

Use Published Labor
Operation Time

*To avoid warranty transaction rejections, carefully read and follow the instructions below:
• The SPS Warranty Claim Code must be accurately entered in the “SPS Warranty Claim Code” field of the transaction.
• When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty
Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the “SPS Warranty Claim
Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided
by SPS.

Page 4

January, 2020

Bulletin No.: 20-NA-001

Warranty Claim Code Information Retrieval
If the SPS Warranty Claim Code was not recorded on
the Job Card, the code can be retrieved in the SPS
system as follows:
1. Open TIS on the computer used to program the
vehicle.
2. Select and start SPS.
3. Select Settings.
4. Select the Warranty Claim Code tab.
The VIN, Warranty Claim Code and Date/Time will be
listed on a roster of recent programming events. If the
code is retrievable, dealers should resubmit the
transaction making sure to include the code in the SPS
Warranty Claim Code field.
Version

1

Modified

Released January 06, 2020

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 equipment, tools, 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 GM dealer for information on whether your vehicle may benefit from the
information.

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CERTIFICATION