Both batt term 30 and ignition term 15 appear at the rear SAM. If you understand that terminology then a good wiring diagram will tell you the rest of what you need to know to tap these circuits. I didn't reply before as it would be unprofessional of me not to warn you about tying into these systems involved without a thorough knowledge of what you are doing.

The SAM is a finicky device and I've seen as little as running the battery down do it in.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician