20 Most Recent 2003 Jeep Grand Cherokee Questions & Answers

2003 jeep GC, or WJ jeep, it is..?
there are no 50a fuses in any JB,
there are just 4 in the PDC. engine bay.
so, JB is wrong, input to me.
ill assume F15 is correct, and not F3/7/12 in PDC
F15 feeds JB via a pink wire. (pk-wt)
this main F15 feed JB , F5,7,8,9 fuse in cab.

so pull fuse 5 to 9 there and the one that ends the drain
is the load that is leaking, (phantom drains)
easy, huh, just 4 fuse to pull.
Cab box, only. called JB on all jeeps.
jb fuse 5 is radio.
jb fuse 7 is HVAC zone control (heat?) skim mod. & auto head lamp sensor & BCM memory, (yes lots)
jb fuse 8 is (12 courtesy lamps , intrusion module(export) and VICS, vehicle info center(memory)
jb fuse 9, front12vdc power outlets (cig ports modern) Cell Phone arked there?

or login at alldata.com and see all that, in the wiring pages.

2003 Jeep Grand... | Answered on Feb 06, 2017

Check the black fuse box under the hood near the battery ! Check it out on you tube !

2003 Jeep Grand... | Answered on Nov 20, 2016

Your probably running hot or you need antifreeze !

2003 Jeep Grand... | Answered on Nov 20, 2016

some engine bay huh ..thats a jeep for you

held on by two long bolts

would think if you cant get it out from the bottom

lots of parts will need parts/plastics
will need to be undone to get the space to take it out
through the top




2003 Jeep Grand... | Answered on Sep 04, 2016

Here's the link and I'm sure you will get the solution of your problem.
Jeep Grand Cherokee Service Repair Manual 1999 2000 2001 2002 2003 2004

2003 Jeep Grand... | Answered on Aug 06, 2016

Dear sir

I think there is something too much tight the cap of coolant box that's why inside the box pressure build.
Kindly use open air type cap to remove moisture inside

Hope answer the question

2003 Jeep Grand... | Answered on Jul 20, 2016

this is a USA forum, and your car is not HERE! a fact !
we dont have 2003 Cherokees here.
Grands yes, not , non grands.
so your car is our.(kinda near) our Liberty
is it gas or diesel.? even saying engine size wins 10 points.
GAS (petrol) answers (wild guessing on my part)
all ways to lose power, in unstated engine,

bogging or misfiring
ever try fresh spark plugs on this puppy.

2003 Jeep Grand... | Answered on Jun 14, 2016

possibly a broken or cracked vacuum hose that is altering the mixture when stopping
could be a brake booster failure

2003 Jeep Grand... | Answered on May 28, 2016

It could be the crankshaft position sensor, but instead of replacing parts on guesswork have vehicle scanned with diagnostic code reader, it will be cheaper in the long run,
let me know how it goes

2003 Jeep Grand... | Answered on May 19, 2016

You need to consult the dealer for special testing. There may be a Technical Service letter on this problem.

2003 Jeep Grand... | Answered on Apr 08, 2016

Likely a bare spot in the wiring somewhere. Not always easy to find. You can try visually inspecting as much of it as you can. There are any number of short finder tools you can buy to help find it. Plenty of videos on youtube showing you how to use them.

2003 Jeep Grand... | Answered on Mar 27, 2016

It's the transfer case position switch. Try unplugging it, if the code clears then replace the switch.

2003 Jeep Grand... | Answered on Feb 13, 2016

Bad grounds. Ground point is on the drivers side, near the rear lights, mounted to the frame.

2003 Jeep Grand... | Answered on Jan 01, 2016

Could be connected, but could also be two different problems.
It could be something in the key switch, or a wiring problem. Or it could be a wiring problem with the temp gauge and something else causing the engine not to start.
Do you have spark and fuel pressure at the injectors ? And does the gas gauge work ?

2003 Jeep Grand... | Answered on Nov 13, 2015

all windows dead? not just drivers? (not stated)
all park lamps dead, all 9 outside lamps dead??????? 3 rear
2 front and sides.? dead, with HL switch to park position?

correct step 1 are fuses
step 2 scan it, the BCM will tell you why it can do its job.
it will.. in most cases.

there are 2 ways (and more) to check fuses.
1: test them all, works every time and takes no knowledge of system complexity. (using ohm meter or voltmeter)
2: read he operator guide and read fuse page. its there. lost that.?
3: read the FSM book or at alldata.com and it there. for sure.

can i assume all else works?, and drive car at night)???????
03 WJ jeep, it is , I have WK 10

so windows can go down so cant test up. on all doors.
Tail lamps. 03.
so front parking lamp work but not rear tail nor rear license plate lamps? that it? the parking lamps is the better name
other wise the front tail lamps out sounds funny.
JB box Fuse 6 runs all park lamps front rear sides and license
so did you miss those lamps?
the relay that runs the run all lamps. all park lamps. lots.
the BCM controls (computer body) controls that relay.
so if main battery is weak the BCM will go nuts. does car drive ok at night
headlights bright?
there is no common demoninator for park and windows.
besides the BCM. it controls 31 major things in the body.
ill check that next. but not windows.
window motors
fuse 12 runs this. PDC fuse box under hood. 50 amps (huge)

ok there is a link from dead parks to windows
that is because the BCM sees you operate the switches
then sends serial commands on the CAN/PCI buss to the door window controllers.
so if you had scanned the pcm , and say gross can buss errors.
then bingo
why not get the car scanned first and show DTC error you have

do the 31 other things work like wipers.
door locks dead.

drive to any shop and say scan my car and get all DTC errors , not just 1 of many.

2003 Jeep Grand... | Answered on Nov 07, 2015

The gauge is showing your temperature not coolant level. Open the hood and remove the coolant cap and top up. Burp the systems by squeezing the hoses. Top up again and replace the radiator cap. Now remove the cap on the water reservoir and fill that to the line. Use antifreeze not water.

Or take it to a garage.

2003 Jeep Grand... | Answered on Oct 09, 2015

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