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Boxster no start

Electrical and Electronic

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster; Year: 1998; Engine (type, size, modifications): stock; Total Mileage: 79111; Transmission: Manual;

The vehicle was towed in for a no start condition. The vehicle would not crank but had good battery voltage. I did an automatic system scan of the vehicle and the alarm control module could not be found. There was code 39 (P1571) Anti-drive-off feature stored in the DME. I checked the diagnostic line between the DME and the alarm control unit for continuity, short to ground, and short to B+. The alarm control module had no signs of being wet or corrosion on the connectors. The vehicle is also having strange electrical problems (spoiler operating erratically, warning lights coming on, engine died while driving.) So I started looking at the instrument cluster, I found that when the cluster is unplugged the pst2 will see the alarm control module and the vehicle will start. But when the cluster is plugged in there is no communication with the alarm control module and the vehicle will not crank. I replaced the instrument control module but when I tried to code it I could not code the mileage through total distance so I had to do it through reading out the old control module and saving the values into the new module. When I did that the new module was coded with 1.8 million miles and the problem has not been fixed. I have also replaced the alarm control module with no results. When the PST2 will not communicate with the alarm control unit it will still communicate with the DME which if I understand correctly the diagnostic line to the DME runs through the alarm control unit. Vehicle has factory radio. We have tried a known good instrument cluster. I am really at a loss here an suggestions are very much appreciated.Adam Brunson

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