M45x AWD V8-4.5L (VK45DE) (2008)
When rear window defogger relay is turned to ON,
Power is supplied
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through rear window defogger relay terminals 5 and 7
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through fuse block (J/B) terminal 2C
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through 10A fuse [No. 8, located in the fuse block (J/B)] and
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through fuse block (J/B) terminal 5B
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to door mirror (LH and RH) terminal 4.
Door mirror (LH and RH) terminal 8 is grounded through body grounds M16 and M70.
With power and ground supplied, door mirror defogger filaments heat and defog the mirror.