Location of air bag module for 2013 gmc terrain

Body Control Module (BCM)
In the center of the instrument panel, behind the HVAC control module and below the radio.
Doesn't use a turn singnal relay (flasher) the BCM flashes the turn signals an hazard lights . Do yourself a favor an take it to a qualified repair shop ,not the dealer .

Unless you have a GM tech 2 scan tool your best bet would be to take your vehicle to the dealer . The BCM - body control module turns those light's on . Probably has DTC'S - diagnostic trouble code's stored .

There is a procedure for this condition. GM says to flush the core with a cleaning agent they sale. I have found Lysol Fresh scent does a much better job of curing the condition.Spray the Lysol in the outside air intake vent while the vehicle is running with it set to max a/c and fan speed also on max. It will take about 1/4th can to fully clear the mildew smell and stop it from growth. When parking the vehicle always put it in max a/c position so the fresh air outside the vehicle will dry out the coil.

These videos should help:
DIY How To Install Cabin Filter 2010 2013 Chevy Equinox GMC Terrain Chevrolet Equinox Cabin Air Filter Replacement 2010 2015 Equinox

Disable/Remove Onstar - YouTube

? 7:58
www.youtube.com/watch?v=KAbTy_jFcbc
Jul 3, 2013 - Uploaded by Bash Smith Remove the 6 T10 screws from the bottom of the Onstar Module. 3. Pull up on the main board to separate it ...

1) Front End Sensor - Right--Located under the front hood in the engine compartment (2) I/P Air Bag--Located at the top right under the instrument panel (3) Roof Rail Air Bag - Right--Located under the headliner, extending from the passenger front windshield pillar to the passenger rear windshield pillar (4) Side Impact Sensor (SIS) - RF--Located under the right front door trim near the lower rear of the door frame (5) Sensing and Diagnostic Module (SDM)--Located underneath the vehicle carpet under the center console (6) Seat Belt Pretensioner - RF--Located under the trim near the bottom of the center pillar (7) Side Impact Sensor (SIS) - RR--Located under the right rear door trim near the lower rear of the door frame (8) Roof Rail Module - Right--Located behind the garnish molding on the upper rear pillar (9) Roof Rail Module - Left--Located behind garnish molding on the upper rear pillar (10) Side Impact Sensor (SIS) - LR--Located under the left rear door trim near the lower rear of the door frame (11) Seat Belt Pretensioner - LF--Located under the trim near the bottom of the center pillar (12) Side Impact Sensor (SIS) - LF--Located under the left front door trim near the lower rear of the door frame (13) Roof Rail Air Bag - Left--Located under the headliner, extending from the driver front windshield pillar to the driver rear windshield pillar (14) Steering Wheel Air Bag--Located on the steering wheel (15) Vehicle Battery--Located at the front left of the engine compartment. (16) Front End Sensor - Left--Located under the front hood in the engine compartment

Has to be removed from inside the vehicle. Remove the covers and you can get to the assembly from inside.

Try the simplist first. Remote batteries good?

If you're finding it difficult to service/repair your car, get one of those online manuals. You'll not have to wait for others to answer, or rely on mechanics and all. Plus i know a website that has very good manuals online,
without expiry i.e. for lifetime.

www.reliable-store.com

the module is located under the center console , CAUTION WHEN WORKING ON AIR BAG SYSTEM, A CERTIFIED TECH SHOULD BE THE ONLY ONE TO WORK ON SYSTEM. this will avoid false deployment or failure of system in a crash.