18NA338 Service Bulletin/Repair Instructions

File in Section:

Bulletin No.:
Service Bulletin
Date:
18-NA-338

November, 2018
TECHNICAL

Subject:
Rear Infotainment Audio Output Choppy/Intermittent When Headphones are

Connected VIA Audio Jack or Bluetooth

Model Year:
Brand:
Model:
Buick
Enclave
2018
Equinox
2018
Chevrolet
Silverado

1500 (New

Model)
2019
Traverse
2018
Sierra 1500

(New Model)
2019
Terrain
2018
GMC
from
VIN:

to
from
Engine:
Transmission:
to
2019
Involved Region or Country
North America
Additional Options (RPOs)
SR2, SR3
Condition
Some customers may comment that the audio is choppy/intermittent when the head

phones are connected either by the audio jack or bluetooth.
Cause
This condition may be caused by GUI software version ver1p7p19.
Correction
If vehicle exhibits this condition, install New software release version known as GUI

version ver1p8p7.
Service Procedure

Important: Stable battery voltage is critical during

programming. Any fluctuation, spiking, over voltage or

loss of voltage will interrupt programming. Install the

EL-49642 SPS Programming Support Tool (GM Dealer

Equipment Item #PSC-550) to maintain system voltage.

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.

There is more than one system, so identifying the

proper system needing an update is the first

preliminary step:
5163549
•
Copyright 2018 General Motors LLC. All Rights Reserved.
The software update only supports one type of

Rear Seat Entertainment accessory system as

shown above.
Page 2
November, 2018
Bulletin No.: 18-NA-338
For version 1p7p19 complete the following steps:

1. Go to the service programming system and save

“A33 media disc player” to a USB stick, It is

released to Service under 8–digit data-file part

number 84538707.
5163552
•
The Rear Seat Entertainment system shown

above, cannot be updated with the software

version indicated in this bulletin.

The second preliminary step is to confirm the software

GUI version on your Rear Seat Entertainment system is

older and needing to be updated.

From the main menu, validate the software version by

selecting:

1. Settings

2. Advanced

3. Update

Updates are available for GUI version ver1p7p19 only:

• If you have any other version, no further update is

available.

• If you have the version mentioned, continue with

procedure.
5163565
2. Turn on both monitors of the SR2/3 system.

Note: Wait for the system to completely boot to the

Home screen.

⇒ If the system is booted, but the Home screen is

not shown, press the Home button on the

remote or monitor.
5163590
3. Validate that both monitors are properly connected:

3.1. Settings

3.2. Advanced

3.3. Update

3.4. Validate “M0 Master” and “M0 Satellite” and

confirm there is information shown next

to both.
Bulletin No.: 18-NA-338
November, 2018
Page 3
4. Press the Home button on the remote or monitor to

return to the Home screen.

5. Insert the USB stick with the software update

loaded on it.

⇒ After a few seconds the update process will

start, displaying a progress bar in the middle of

both screens. The full update process will take

about 5 minutes.

Note: Do not disturb until the system returns to the

Home screen.
5163574
⇒ If one of them does not have information

shown, the monitors are not properly connected

to each other. Try turning off power, checking all

connections, then reboot.

⇒ Updates will be to GUI version ver1p7p19.
6. The update process will go through several

phases:

• Progress bar

• Solar system animation

• Android icon with progress bar

• Solar system animation

• GM logo animation

• Home screen

• Update complete

7. Validate that the software is now updated to the

version ver1p8p7 by selecting:

7.1. Settings

7.2. Advanced

7.3. Update

When the software has been confirmed, the update is

complete.
Parts Information

No parts are required for this repair.
Warranty Information

For vehicles repaired under the Bumper-to-Bumper

coverage (Canada Base Warranty coverage), use the

following labor operation. Reference the Applicable

Warranties section of Investigate Vehicle History (IVH)

for coverage information.
5163612
Labor Operation
Description
Labor Time
3481058*
Rear Infotainment Monitor Software Update
0.6 hr
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
Released November 09, 2018
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.
WE SUPPORT VOLUNTARY

TECHNICIAN

CERTIFICATION

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