Back up light relay

Lost my back up lights on my 2010 4X4. Gen2
bulbs checked, all fuses checked, no apparent wiring issues.
Next step is check the back up light relay.
Found the part number but cannot find the location of the relay.
An online diagram shows it under the dash on the firewall. If so it must be invisible.
Anyone familiar with the location?

 

The *1 next to the wiring for the relay denotes it’s only for column shift trucks. If yours has the shifter in the center console, like most Tundras, it will not have a back up light relay.



Double check fuses shown in diagram. Get a voltmeter and check for power at the tail light connector