How does the alarm system work?

[NMPastor]

2005 absolutely base Suburban (not even an LS), 356k on the odometer.

Various circuits were starting to go in the driver door harness. Purchased one from a dealer online and had my mechanic put it in. Now every time I unlock and open the driver door the alarm goes off. Mechanic is just shrugging his shoulders.

The stock alarm isn't very sexy or electronic, as far as I know. But can anyone point me to something that discusses exactly how the alarm on this faithful beast works?

Thanks.

 

[Big Mama]

The harness is basically plug and play with no stray wires to solder or splice. Check each connection to ensure they’re tight. You can also disconnect your battery for about 30 seconds to reset the alarm. Some trucks have a reset button too. Does this happen with the key and remote? It’s possible your fob needs reprogramming.

 

[TJ Baker]

2005 absolutely base Suburban (not even an LS), 356k on the odometer.

Various circuits were starting to go in the driver door harness. Purchased one from a dealer online and had my mechanic put it in. Now every time I unlock and open the driver door the alarm goes off. Mechanic is just shrugging his shoulders.

The stock alarm isn't very sexy or electronic, as far as I know. But can anyone point me to something that discusses exactly how the alarm on this faithful beast works?

Thanks.

What are your available resources? Any sort of scanner/scantool/obd2 dongle?

What sort of things were going wrong in the drivers door before replacing the harness?