1992 Lexus LS 400

Electrical problem
1992 Lexus LS 400 V8 Two Wheel Drive Automatic 250, 00 miles

my car cranks over but wont start. My alarm system is not working. When I lock the door the red light wont flash or when I shake or open door the alarm wont sound. I wiggled the main engine relay and my car started. But I really dont no if its the relay or the security system. Can you please tell me also what does the main engine relay control and can a security malfunction cause my car to not start?
August 23, 2008.

I have the same car and I'm having the same problem. Were you able to fix that problem? If so, what had to be done to fix it?

Jan 13, 2012.