Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

Under dash photo request 09 H3 3.7

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Old Apr 29, 2026 | 09:26 AM
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gaber6's Avatar
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Default Under dash photo request 09 H3 3.7

RESOLVED: Found plug. I tried plugging in a wire that was spliced behind the OBD to another spot that looked close. Got the same beep beep beep on startup but then the port communicated with the scan tool. I'll just have to do that before getting my emissions test from now on.

I had a aftermarket security module cut out because of a horn beep on startup and didn't realize the cheap fix I paid did what I didn't want to happen if I did it myself. The OBD port now doesn't connect. I have some cut wires and wonder where the red and black off the back of the OBD might connect to. #3 & #4.

Any help would be awesome. Thanks!



 

Last edited by gaber6; Apr 29, 2026 at 09:50 AM. Reason: Found problem
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