Hello I have a 2000 GMC Yukon Denali that is intermittently

Posted on Feb 6, 2014

A 2000 GMC Yukon Denali that is intermittently losing power to the radio, power windows and wipers. I know these are all fed from the RAP relay but I find it hard to believe the relay could be failing at such random intervals with no apparent pattern. Could the BCM be failing If so how can I check this Any help would be appreciated, it`s driving me crazy! Thanks, Josh

Hello I have a 2000 GMC Yukon Denali that is intermittently
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I haven`t been able to check much. Just tried to recognize a pattern, but there doesn`t seem to be one. Sometimes it doesn`t happen at all and sometimes it cycles on/off a couple times a minute. It started by tripping when you pushed the window button but now will do it without touching anything and with the radio on or off. At first I checked the power window wiring and grounds but I can`t find anything wrong (obviously). One more thing, when it`s tripped sometimes you can get to come on by locking/ unlocking the doors quickly, but not always. According to the service documents, there is no RAP relay. The control of the power to the components you mentioned is done by the BCM, so yes, it could be a problem with that module. But what is more common is that a connector or fuse is coming loose, especially when the vehicle goes over bumps or there are temperature changes (connectors expand & contract). In the mean time, I would check the socket of that main fuse (IGN B), and if you have access to the BCM connectors, see if there are any "obvious" loose connectors or wires, especially the Dark Blue wire at pin C2 of Connector C2. Here are the connector C304 pins. Pins B9 & G2 are where the power comes out and in, and are the pins of interest. This an "inline" connector, and is also suspect. You might want to wiggle these wires and connectors and see if you can reproduce the problem. A test light or multimeter would also be...

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