2003 Saturn L - AC seems to do its own thing

Maintenance/Repairs
1

ac/heater comes on by itself with no prompting from driver or passengers.
What could cause this? Is it the control module or a computer problem?

2

The BCM controls the HVAC system functions.

2008-09-17_170452_SHOT1017
2008-09-17_170452_SHOT1017512×582 36.8 KB

Tester

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