When you press the key fob and the lights don't flash or there is no chime tells me the power lift-gate module is not getting that signal. This will also explain why the other options to open the lift-gate are not working.
I suspect the PLGM has failed or there is a wiring issue going to it where it cannot open the gate.
I attached the operation of how this works. You will see that the buttons are hard wired but the key fob is sent via the CAN network to the PLGM which opens and closes the door. The fact that none of them are working points to this being the issue.
If we have a scan tool we can confirm all of this, otherwise we will need to access the module and check power and ground. However, if you are not familiar with CAN bus diagnostics then we will need to walk through that separately.
Basically on the CAN + you need 2.7 volts and CAN - you need 2.3 volts at the module. If you don't have any of these then we have a wiring issue.
Images (Click to make bigger)
Tuesday, October 15th, 2019 AT 2:54 PM