Junction Block explained - Jeep Commander Forums: Jeep Commander Forum
Electronics / NAV Discussion This section contains discussion about the electronics system and NAV system in the Jeep Commander.

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post #1 of 10 (permalink) Old 06-08-2016, 07:51 AM Thread Starter
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Junction Block explained

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
Attached Files
File Type: pdf Junction block remove.pdf (162.7 KB, 455 views)
File Type: pdf Junction block pictures.pdf (232.1 KB, 55 views)
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Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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Last edited by Big Blue; 04-04-2019 at 11:11 PM.
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post #2 of 10 (permalink) Unread 04-01-2019, 06:41 PM
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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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post #3 of 10 (permalink) Unread 04-02-2019, 02:04 AM
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Quote:
Originally Posted by Big Blue View Post
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 the link at the top of the post and also see the attached file at the bottom of the post.

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post #4 of 10 (permalink) Unread 04-02-2019, 07:01 AM Thread Starter
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Join Date: May 2009
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Current Mileage: 103,000
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Quote:
Originally Posted by Big Blue View Post
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.....
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?

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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post #5 of 10 (permalink) Unread 04-02-2019, 02:27 PM
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Join Date: Oct 2015
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Quote:
Originally Posted by rblapham View Post
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?
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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Last edited by Big Blue; 04-02-2019 at 02:47 PM.
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post #6 of 10 (permalink) Unread 04-02-2019, 02:30 PM
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Join Date: Oct 2015
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Quote:
Originally Posted by jeep5253 View Post
Click the link at the top of the post and also see the attached file at the bottom of the post.
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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post #7 of 10 (permalink) Unread 04-02-2019, 05:58 PM
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Quote:
Originally Posted by rblapham View Post
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?
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.


Attached Files
File Type: pdf Junction block pictures.pdf (232.1 KB, 27 views)


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Last edited by Big Blue; 04-02-2019 at 06:13 PM.
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post #8 of 10 (permalink) Unread 04-02-2019, 06:15 PM Thread Starter
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Join Date: May 2009
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Current Mileage: 103,000
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Quote:
Originally Posted by Big Blue View Post
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.


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.
Attached Files
File Type: pdf Junction block pictures.pdf (232.5 KB, 26 views)

06 Commander Limited Hemi - QDII,
Past -89 Comanche, 98 Grand Cherokee (2WD), 2000 Cherokee, 05 Grand Cherokee Limited 4.7
Had to replace the brakes - they opened more gas stations in town
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post #9 of 10 (permalink) Unread 04-02-2019, 06:18 PM
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Join Date: Oct 2015
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Model year: 2008
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Quote:
Originally Posted by rblapham View Post
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.
None of us are my friend...and on that note, thanks for sticking around.


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post #10 of 10 (permalink) Unread 04-04-2019, 11:03 PM
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Join Date: Oct 2015
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4WD
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Current Mileage: 102,100
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Quote:
Originally Posted by rblapham View Post
Blue,
I think this picture would be better
I'll add it @rblapham. Thank you.

EDIT: Done.


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Last edited by Big Blue; 04-04-2019 at 11:12 PM.
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