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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
So far this is looking like a failure of the GEM module.
Do you understand wire diagrams and wire testing and can you do some testing when the locks are failing?
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The GEM is under the left side of the dash. Using the diagrams and tests below can you follow these steps when the locks are not working.