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Junction Block explained

30156 Views 14 Replies 4 Participants Last post by  Big Blue, 
rblapham
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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

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Big Blue
I don't see the nice detailed/illustrated photo that use to be attached to this post anymore.....that's unfortunate.

@rblapham do you still have the pic that used to be attached to this post? Maybe you can re-attach it if that's possible.....
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jeep5253
Big Blue said:
I don't see the nice detailed/illustrated photo that use to be attached to this post anymore.....that's unfortunate.

@rblapham do you still have the pic that used to be attached to this post? Maybe you can re-attach it if that's possible.....
Click to expand...
Click the link at the top of the post and also see the attached file at the bottom of the post.
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rblapham
Big Blue said:
I don't see the nice detailed/illustrated photo that use to be attached to this post anymore.....that's unfortunate.

@rblapham do you still have the pic that used to be attached to this post? Maybe you can re-attach it if that's possible.....
Click to expand...
Do you remember what the picture was of? or did Jeep 's post fix it? I looked and do not have any pictures that might fit the post?
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Big Blue
rblapham said:
Do you remember what the picture was of? or did Jeep 's post fix it? I looked and do not have any pictures that might fit the post?
Click to expand...
It was a photo of the junction block & different fuse blocks that had some drawing & writing on it......I assumed it was something that you made.

I'm kicking myself now for not having saved a copy of it over the years.
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Big Blue
jeep5253 said:
Click the link at the top of the post and also see the attached file at the bottom of the post.
Click to expand...
I did that, it's not the link at the top and it's not the PDF attached to the bottom; There used to be a photo of the fuse blocks with some circles & writing that was typed on it.....it was pretty nice, I don't know what happened to it;

I'm wondering if this has something to do with the change they made to the forum.....I know as of a week ago, the photo was still there.
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Big Blue
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rblapham said:
Do you remember what the picture was of? or did Jeep 's post fix it? I looked and do not have any pictures that might fit the post?
Click to expand...
Digging through some of your old posts, I found one of the photos; I'm pretty sure there was one more nicely illustrated photo similar to this that I can't seem to come up with - or maybe it was just my imagination and this was the only one;

Anyway, here is the one I found, maybe it will jog some memories for you @rblapham; I'm going to reinsert this back into your original post where it used to be; I have it saved now for posterity....LOL. I'm attaching another .PDF I grabbed off of one of your old posts too, this seems like a good place for it; see attachment.

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rblapham
Big Blue said:
Digging through some of your old posts, I found one of the photos; I'm pretty sure there was one more nicely illustrated photo similar to this that I can't seem to come up with - or maybe it was just my imagination and this was the only one;

Anyway, here is the one I found, maybe it will jog some memories for you @rblapham; I'm going to reinsert this back into your original post where it used to be; I have it saved now for posterity....LOL.
Click to expand...
Blue
Yes I found that one. Possibly this PDF has the others. That's been a long time ago and I'm not getting any younger.:frown2:

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Big Blue
rblapham said:
Blue
Yes I found that one. Possibly this PDF has the others. That's been a long time ago and I'm not getting any younger.:frown2:
Click to expand...
None of us are my friend...and on that note, thanks for sticking around. :smile2:
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Big Blue
rblapham said:
Blue,
I think this picture would be better
Click to expand...
I'll add it @rblapham. Thank you.

EDIT: Done.
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Big Blue
Too much valuable information in this thread to leave it buried in the archives of the Electronics / NAV Discussion sub-forum, so, the time has come to make this thread a sticky; Now it's easy for everybody on the forum to find if needed.

Many thanks to @rblapham for his contributions.
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Colonel08
Switch-Window/Door Lock-Passenger
Transponder-Tire Pressure-LeftFront
Transponder-Tire Pressure-RightFront
Transponder-Tire Pressure-RightRear
Wiring-Trailer Tow 7-Way
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Just out of curiosity- there is no Transponder for the Left Rear Tire Pressure?
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Big Blue
Colonel08 said:
Just out of curiosity- there is no Transponder for the Left Rear Tire Pressure?
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@Colonel08 ;

I believe all TPM (Tire Pressure Monitor) sensors, are considered transponders and every tire has one - including the spare tire, which is often overlooked.

I can't tell you why it's not listed.
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rblapham
The transponders listed are the receivers mounted near the wheels. The two back tires and the spare use only one.
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Big Blue
rblapham said:
The transponders listed are the receivers mounted near the wheels. The two back tires and the spare use only one.
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Thats good information, which now makes sense & I stand corrected.

I thought the sensors themselves, also functioned as individual transponders.

Thanks for the knowledge @rblapham .
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