
Crux Interfacing Solutions • 6860 Canby Ave., Suite 104, Reseda, CA  91335
phone: (818) 609-9299 • fax: (818) 996-8188 • www.cruxinterfacing.com
rev.021419
BTGM-33
Bluetooth Handsfree + 4 Channel Audio Streaming for
GM LAN 29 Bit Vehicles  
1 of 2
-  Adds Bluetooth Handsfree Calling to the OEM radio.
-  Adds 4 channel Bluetooth Music streaming to the OEM Radio.
-  Maintains the use of the factory XM radio, if equipped.
-  Automacally pauses BT Streaming when a call is received, and resumes when the call is ended.
-  Allows user to answer, end calls track up and track down using the steering wheel controls. 
-  DSP and Echo-Cancellaon allows for clear conversaons on both sides of the phone call. 
-  Automacally mutes any source as soon as a call is received, and resumes when call is ended.
-  Allows any previously paired mobile phone to automacally re-connect to the Bluetooth interface.
-  Fully retains OnStar funconality.
-  Hear Navigaon App voice prompts from the factory speakers while in Bluetooth mode.
-  Magnec Phone Mount Included.
INSTALLATION INSTRUCTIONS:
1.  Remove the radio to gain access to 
the connectors.
2.  Unplug the factory radio connectors 
and plug them into the BTGM-33 
T-harness.
3.  Plug the male connectors of the 
BTGM-33 T-harness to the radio.
4.  Mount the microphone to a desired 
locaon. We recommend mounng it 
by the rearview mirror or the A pillar. 
Point the microphone towards the 
driver.
5.  Run the microphone wire along the 
front headliner, down the A pillar and 
towards the radio. Plug the 3-pin plug 
of the microphone cable to the mang 
connector on the BTGM-33 T-harness.
6.  Plug the 12-pin Molex connector to 
the BTGM-33 module.
NOTE ON iPhone / iOS DEVICES: It can take approximately 2 minutes for the phone to reconnect aer the vehicle is restarted.