Grand Cherokee 2WD V8-4.7L VIN J (2004)
Amplifier: Description and Operation
AMPLIFIER
Models equipped with the Infinity premium speaker package have a separate power amplifier unit. This power amplifier is rated at 180 watts output.
The power amplifier unit is mounted to the rear floor panel under the passenger side rear seat cushion. The power amplifier unit can be accessed for
service by unlatching and tilting the passenger side rear seat cushion forward.
The power amplifier unit should be checked if there is no sound output noted from the speakers. The power amplifier cannot be repaired or adjusted
and, if faulty or damaged, the unit must be replaced.
The power amplifier is energized by a fused 12 volt output from the radio receiver whenever the radio is turned on. The power amplifier receives the
sound signal inputs for four speaker channels from the radio receiver, then sends the amplified speaker outputs for each of those channels to the six
Infinity speakers. 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.