Backstory:
I recently had a bit of an accident where I jumped a curb. Don't ask how. I got stupid. Now, I have my SLIP, TCS, and ABS lights on perpetually, and when I start the car, there's a slight buzzing sound for about 3 seconds coming from around where the brake fluid is located. Brake fluid levels are good, and the car feels fine otherwise. I plugged in Cipher and read the code from the ABS, and it came back with C1103.

Problem:
I can't, for the life of me, figure out what C1103 is. I'm assuming it's an ABS sensor, but I don't know which one. I've been under the car and inspected each one, but they all look fine. One online search landed me in GTR territory and said it was the right rear ABS sensor. Another landed me in the FX35 service manual and told me it was the front right ABS sensor. Searching through my own 2006 350Z FSM told me absolutely nothing. Can somebody with a little more knowledge and experience please tell me what's going on?

 

C1103 - ABS Hydraulic Brake Switch Circuit Failure. All I have found so far.

I will keep looking for you.

Edit I. Found this related to the Brake Switch Circuit Failure. It's not for a Z, but it relates to ABS systems.

Edit II. Found something talking about the ABS pump motor itself.

I would check the connection to the ABS system under the hood.

 

"...when I start the car, there's a slight buzzing sound for about 3 seconds coming from around where the brake fluid is located."

That's the normal self-test the system does each time the engine is started. It's even mentioned in the owner's manual.

 

This is when the key is turned to the "ON" position, when the engine has not been started. And this is certainly a new sound.

 

I need to find out where that is under the hood. It sounds like it's coming from some place I can't reach. I've checked the wired connections in the wheel well where the ABS sensor cable connects, and they all look fine. Perhaps I'm just not looking hard enough. Thanks for helping out thus far. I really appreciate it.

 

No Prob. The ABS system is located on the drivers side under the hood where the brake booster is.

 

The ABS system (at least the module under the "Brake" lid under the hood) seems to be hooked up just fine. Nothing loose or visibly damaged. However, I can feel with my hand that this is the location of the buzzing that I hear when I turn the key to "ON". I'm not sure if this is it trying to do something and failing or if it's a sort of sound just indicating the problem.