Key to power position blows CECU BATT POWER 1

Probably corrosion somewhere causing high resistance.
@Goodysnap @spsauerland

 

Wont be easy to track down. Any moisture or evidence of water inside any of the CECU connectors? May not be a short but rather an over amperage situation. Disect the wiring schematic, checking the circuit for continuity to ground and see if it branches anywhere else other than the CECU that may lead you to the source of excess amp draw on the circuit.

 

Exactly which fuse (picture of location) and last six of VIN.

 

Here is the diagram. If wiring checks ok, I would try unplugging gauges and MCS one @ a time to see what is pulling excess amperage. Someone that could hook up with ESA might get you some more clues.

 

I was wondering if you ever came up with a solution. I have a truck doing the exact same thing

 

Did you ever figure the problem? I have a truck doing the exact same thing

 

The batt 1 wire to the cecu only goes to one place which is the cecu. Only a few things I see that could blow the fuse, one is something is wrong inside the pdc which is unlikely but possible. the wire between the pdc and cecu has a rubbed point on metal somewhere in the dash. or the cecu is failing and draws too much current on the batt 1 circuit once supplied an ignition wakeup signal and powers up. you could isolate the ignition wakeup and supply you own with a jumper form the battery and see if the fuse blows.