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When I ordered the truck, I had requested to the dealer that they install Toyota's back up camera - camera module only.   This is a neat little package with a fisheye lens camera built into the tailgate latch:

Backup camera

So now came up the the question of the connections to it.   I knew it was in the headliner but I didn't see anything that looked like it would be connected to a camera.   A quick drive over to the dealership proved that it was indeed this little connecter towards the front:


...but again, this is not what you would expect video on.   There was four wires taped together as per the schematic:

Toyota wiring diagram

To be safe, I pulled the tailgate apart and checked for continuity on the wires:

Tailgate wiring

Sure enough, these are the right wires.   So I spliced a sheilded RCA cable to the video feed (red V+, grey V-) and a red/black cable for the camera power (black B+, white GND):

Wire Colour Function
Red V+ Video positive (center of coax)
Grey V- Video Negative (sheild of coax)
Black CA+ Camera Supply Voltage (regulated power must be provided to this point - see below)
White CGND Ground (ground must be brought to this point)
Green Active high reverse indicator (switches from 0v to 12v when truck put into reverse)

A Tundra Solutions forum member (1tundradude) discovered in a Toyota document that the supply voltage for the back-up camera is supposed to be between 5 and 7 volts.   Normally, this regulated voltage would be supplied by Toyota's monitor but since I am using the Alpine display, I have to provide it myself.

Toyota document

Luckily, this is an easy fix - all that is required is a Voltage Regulator.

I had on hand an NTE956 which is a generic version of an LM317.   This is an adjustable voltage regulator whose output is set with a simple voltage divider:

Voltage regulator circuit

A couple quick calculations finds my resistor values (R1 = 100ohms and R2 = 420ohms) and I can solder it together.   Of course it is rare to find the exact values for resistors so I had to put a 220 and a 200 in series.

Assembled voltage regulator

Regardless of my input voltage, the output remains steady at 6.76v:

Functioning VR

A bit of heat shrink to protect the connections:

Protected VR

And it is soldered in line:

Connections to monitor connecter

All these cables were fished down the A-pillar and over to the center console.