what controls the relay it dont start when I put my key on to start my car

1992 MERCEDES BENZ 400E
151,000 MILES
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PATRICKTASS
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when priming the trottle body car will start. Relay begins to work when starting the car the relay is not coming on my question what controls the relay
Nov 3, 2011 at 8:25 PM
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RASMATAZ
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Could be the computer has to ground the relay
Nov 3, 2011 at 8:31 PM