DAS might be a stand alone unit in those years. I _think_ only the ML has the DAS / locks linked.

Whenever the ATA (anti theft alarm) started to stay armed even when the key / remote was used on my SL, the remote locks became erratic and would no longer work / resync. I wonder if the anti theft system can shut the engine down if it thinks there is a break in even if a valid key is used. Might be worth unplugging the ATA and RCL.