I N S TA L L AT I O N I N S T R U C T I O N S
AXSUB-GM3
AxxessInterfaces.com © COPYRIGHT 2024 METRA ELECTRONICS CORPORATION REV. 3/5/24 AXSUB-GM3
• AXSUB-GM3 interface
• AXDSPX-GM3 vehicle T-harness (LD-DSP-GM30)
• Bass knob (LD-BASSKNOB)
NOTE: SELECT VEHICLES EQUIPPED WITH RPO: IOU/IOS/IOT
INTERFACE FEATURES
GM (Add a SUB) Interface
2019-UP
Visit AxxessInterfaces.com for more detailed informaon
about the product and up-to-date vehicle specic applicaons
INTERFACE COMPONENTS
•
Can be used in non-amplified models only
• Easy behind the radio installation with pre-wired harness
• Bass knob included for level control of subwoofer amp
• Micro-B USB updatable
TOOLS REQUIRED
TABLE OF CONTENTS
Connections.................................................................2
Programming..............................................................3
Testing..........................................................................3
Specifications...............................................................3
Troubleshooting..........................................................4
ATTENTION: With the key out of the ignition,
disconnect the negative battery terminal before
installing this product. nsure that all installation
connections, especially the air bag indicator
lights, are plugged in before reconnecting
the battery or cycling the ignition to test this
product.
NOTE: Refer also to the instructions included
with the aftermarket radio.
• Crimping tool and connectors, or solder gun,
solder, and heat shrink • Tape • Wire cutter
• Zip ties • Multimeter
www.AxxessInterfaces.com
www.MetraOnline.com
MetraOnline.com may be used to assist with
dash assembly instructions. Simply enter your
Year, Make, Model vehicle into the vehicle fit
guide and look for the Dash Kit Installation
Instructions.
If the vehicle is equipped with Active noise
cancelation (ANC) microphones, they will
need to be bypassed. Please refer to www.
Axxessinterfaces.com for ANC bypass
harnesses offered for select
vehicles.
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