AXDSPH-NI2
I N S TA L L AT I O N   I N S T R U C T I O N S
AxxessInterfaces.com  © COPYRIGHT 2022 METRA ELECTRONICS CORPORATION  REV. 8/12/22 INSTAXDSPH-NI2
ATTENTION: With the key out of the ignition, 
disconnect the negative battery terminal 
before installing this product. Ensure 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 accessory before 
installing this device.
TABLE OF CONTENTS
Installation Options ...............................................2
Installation .............................................................2
20-Pin Harness Pinout...........................................3
Adding A Subwoofer To A Factory System...........4
Adding A Full-Range Amp and  
   Subwoofer To A Factory System ........................5
AX-DSP T-Harness
The Axxess T-harness is a basic and simple plug-n-play harness for 
easy installation of the AXDSP-X   AXDSP-L or (sold separately) for 
vehicle specific applications. Most T-harnesses created by Axxess 
will have an 8-pin harness, with the speaker wires pinned. If you are 
installing a 4-channel amplifier with one of the AXDSP interfaces, 
leave these connectors disconnected. The only reason for connecting 
these harnesses together would be if the AXDSP interface is being 
used for adding a subwoofer amplifier only. Some T-harnesses 
require additional wiring and/or installation steps, see page 2. 
Refer to page 3 for a pinout legend for the 20-pin harness, and also 
additional wiring and notes.
APPLICATIONS
Visit AxxessInterfaces.com for more detailed 
information about the product and  
up-to-date vehicle specific applications. 
Visit Metraonline.com AxxessInterfaces.com or 
for harness and interface options.
Visit 
AxxessInterfaces.com 
for current application list.