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Old 08-16-2011, 11:57 PM   #7
derklug

 
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Drives: 12 Boss 302
Join Date: Sep 2009
Location: Grand Rapids, Mi
Posts: 1,369
I no longer work at a dealership, but consider this. In 1982, most cars had 1 relay(starter) and no computers. When a dome light stayed on, you disconnected door jamb switches untill the light went out. Now the dome light has no connection to the door jamb switches. The switches tell the body control module to turn on the dome light. The typical car has 25 or more relays and at least 3 and as many as 11 control modules. If one of those modules or relays had an intermittent problem that didn't set a code, throwing parts at the problem won't help. In such a situation, if the fault isn't currently happening, testing gets you nowhere. The problem HAS to happen while the car is at the dealership for them to find it.
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