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Hi, my name is***** you checked power to the starter solenoid when turning the key to the start position?
Yes the Pulse Module is the starter relay. You need to check your inputs to the module or just try a known good module. More than likely the module is faulty or you are not getting a terminal 50 signal to the module when you turn the key.
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You should be getting a ground from the ECU on terminal A2 (small pink/red wire) of the pulse module when you turn the key to the start position.
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Are you able to scan the engine and transmission control modules?
If the ECU does not recognize that the car is in park it will not let the starter turn. If the conductor plate in the transmission is bad or if there is a linkage problem it could cause the no crank.
Can your scanner read fault codes and actual values in the DAS control module? It sounds like the DAS control module is bad or the key is bad.
You can either have the customer order a new key or you can replace the DAS control module and see if it will start. Also make sure that there is power to the module. Fuse 35 and 37 power the module. If your scanner can read the actual values of the drive authorization system you can see if the key is being recognized.