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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Which door is showing ajar?
With the iphone plugged in, what is powering on and off?
A scan tool can be used to see which door as well as a volt meter. Do you have either of these tools?
No you will not be checking codes. You will be checking to see which doors are showing open.
Since your scan tool sill not do what is needed, then a new voltmeter needs to be purchased to see which sensor is sending ground to hte VSM using the diagram below.
Can you monitor fuses 39 and 41 for the power points and let me know if they too are losing voltage?
Please read this:
Thanks for using Just Answer, Chris
Were you getting a door ajar warning when doing the tests? If so but none were showing ajar then the VSM is faulty.
You test the fuse by touching the test pins on there face with a red volt meter lead.
Hello again Chris here,
Glad you found the issue. Hopefully my wire diagram assisted you.