1 wire trick for turning the factory radio amp

[Rede2go]

I did find while searching thru all the posts on radio problems there are a few that talk about a 1 wire trick to power the factory radio amplifier. However i could find nothing telling me where to find this place to apply 12volts to fire the relay to power the AMP.
Can anyone tell me how to find the place i need to run power too? is it a certain pin on the factory 22 pin radio plug? If so which pin or color wire or where the relay is and what pin on the relay? Please help me I really want to get this done for my wife. Thank you all for reading.

 

[nbas]

Check the Service Manual for your vehicle year. Check also the wiring diagrams. The following is for 2004 Liberty:

AMPLIFIER CHOKE AND
RELAY
DESCRIPTION
Vehicles equipped with the premium speaker package
have a amplifier choke and relay. The amplifier
choke and relay is mounted to the lower instrument
panel above the pedals and towards the instrument
panel center stack.
The amplifier choke and relay should be checked if
there is no sound output from the speakers. The
amplifier choke and relay can not be repaired or
adjusted and, if faulty or damaged, the unit must be
replaced.
OPERATION
The amplifier choke and relay is used to control
the supply of fused battery current to the front door
speaker-mounted dual amplifiers. The speaker relay
is energized by a fused 12 volt output from the radio
receiver whenever the radio is turned on. For complete
circuit diagrams, refer to the appropriate wiring
information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, details of wire harness routing and
retention, connector pin-out information and location
views for the various wire harness connectors, splices
and grounds.

 

[LibertyTC]

FSM located here: http://www.colorado4wheel.com/manuals/Jeep/KJ/