The Junction block is the assembly located under the dash just to the left of the steering wheel. It contains 30 fuses and has many of the electrical circuits used in the Commander. Following is a list of the circuits that are on the Junction Block as well as a link to Chrysler parts for the Junction Block. There are several different part numbers for the Junction Block and it depends on the features for the Commander. If replacing it would be good to take your current one out and take it to the parts department for a new one. Today's listed price was $193.20. I will also include the write up from the service manual of how to remove and replace the Junction Block.
JUNCTION BLOCK
The following circuits are contained on or pass through the Junction Block
Actuator-Blend Door-Rear
Actuator-Mode Door-Rear
Amplifier-Radio
Assembly-Shifter Lever
Circuit Breaker No. 1
Circuit Breaker No. 2 (JB)
Circuit Breaker No. 3
Control-A/C-Heater
Control-A/C-Heater-Rear
Data Link Connector
Fuses 1 thru 30
Glass-Liftgate
Lamp-Cargo
Lamp-Center High Mounted Stop
Lamp-Courtesy-Left Front Overhead
Lamp-Courtesy-Lower-Left
Lamp-Courtesy-Lower-Right
Lamp-Courtesy-Right Front Overhead
Lamp-Dome-Rear
Lamp-Glove Box
Lamp-Grab Handle-Left Front
Lamp-Grab Handle-Right Front
Lamp-Tail/Stop/Turn-Left
Lamp-Tail/Stop/Turn-Right
Lamp-Vanity-Left
Lamp-Vanity-Right
Latch-Flip-Up Glass
Media System-Monitor/Dvd
Mirror-Inside Rearview
Mirror-Outside Rearview-Driver
Mirror-Outside Rearview-Passenger
Module-Antilock Brakes
Module-Compass
Module-Door-Driver
Module-Door-Passenger
Module-Electronic Overhead
Module-Final Drive Control
Module-Front Control
Module-Hands Free
Module-Heated Seats
Module-Integrated Power
Module-Memory Seat
Module-Occupant Classification
Module-Park Assist
Module-Powertrain Control
Module-Sentry Key Remote Entry
Module-Steering Control
Module-Transmission Control
Motor-Blower-Rear
Motor-Rear Window Wiper
Motor/Module-Sunroof
Power Distribution Center
Power Outlet-Console
Power Outlet-Instrument Panel
Power Outlet-Rear
Radio
Receiver-Satellite
Relay-A/C Clutch
Relay-Blower Motor-Front
Relay-Blower Motor-Rear
Relay-Door Lock
Relay-Door Unlock-Driver
Relay-Door Unlock-Passenger
Relay-Flip-Up Glass
Relay-Fuel Pump
Relay-Power Outlet
Relay-Rear Window Defogger
Relay-Run
Relay-Run/Accessory
Relay-Run/Accessory Delay
Relay-Transmission
Relay-Wiper High/Low
Relay-Wiper On/Off
Relay-Wiper-Rear
Sensor-Rain
Switch-Bank-Lower
Switch-Bank-Upper
Switch-Ignition
Switch-Mirror
Switch-Seat-Driver
Switch-Seat-Passenger
Switch-Stop Lamp
Switch-Transfer Case Selector
Switch-Window/Door Lock-Driver
Switch-Window/Door Lock-Passenger
Transponder-Tire Pressure-LeftFront
Transponder-Tire Pressure-RightFront
Transponder-Tire Pressure-RightRear
Wiring-Trailer Tow 7-Way
JUNCTION BLOCK
The following circuits are contained on or pass through the Junction Block
Actuator-Blend Door-Rear
Actuator-Mode Door-Rear
Amplifier-Radio
Assembly-Shifter Lever
Circuit Breaker No. 1
Circuit Breaker No. 2 (JB)
Circuit Breaker No. 3
Control-A/C-Heater
Control-A/C-Heater-Rear
Data Link Connector
Fuses 1 thru 30
Glass-Liftgate
Lamp-Cargo
Lamp-Center High Mounted Stop
Lamp-Courtesy-Left Front Overhead
Lamp-Courtesy-Lower-Left
Lamp-Courtesy-Lower-Right
Lamp-Courtesy-Right Front Overhead
Lamp-Dome-Rear
Lamp-Glove Box
Lamp-Grab Handle-Left Front
Lamp-Grab Handle-Right Front
Lamp-Tail/Stop/Turn-Left
Lamp-Tail/Stop/Turn-Right
Lamp-Vanity-Left
Lamp-Vanity-Right
Latch-Flip-Up Glass
Media System-Monitor/Dvd
Mirror-Inside Rearview
Mirror-Outside Rearview-Driver
Mirror-Outside Rearview-Passenger
Module-Antilock Brakes
Module-Compass
Module-Door-Driver
Module-Door-Passenger
Module-Electronic Overhead
Module-Final Drive Control
Module-Front Control
Module-Hands Free
Module-Heated Seats
Module-Integrated Power
Module-Memory Seat
Module-Occupant Classification
Module-Park Assist
Module-Powertrain Control
Module-Sentry Key Remote Entry
Module-Steering Control
Module-Transmission Control
Motor-Blower-Rear
Motor-Rear Window Wiper
Motor/Module-Sunroof
Power Distribution Center
Power Outlet-Console
Power Outlet-Instrument Panel
Power Outlet-Rear
Radio
Receiver-Satellite
Relay-A/C Clutch
Relay-Blower Motor-Front
Relay-Blower Motor-Rear
Relay-Door Lock
Relay-Door Unlock-Driver
Relay-Door Unlock-Passenger
Relay-Flip-Up Glass
Relay-Fuel Pump
Relay-Power Outlet
Relay-Rear Window Defogger
Relay-Run
Relay-Run/Accessory
Relay-Run/Accessory Delay
Relay-Transmission
Relay-Wiper High/Low
Relay-Wiper On/Off
Relay-Wiper-Rear
Sensor-Rain
Switch-Bank-Lower
Switch-Bank-Upper
Switch-Ignition
Switch-Mirror
Switch-Seat-Driver
Switch-Seat-Passenger
Switch-Stop Lamp
Switch-Transfer Case Selector
Switch-Window/Door Lock-Driver
Switch-Window/Door Lock-Passenger
Transponder-Tire Pressure-LeftFront
Transponder-Tire Pressure-RightFront
Transponder-Tire Pressure-RightRear
Wiring-Trailer Tow 7-Way