Question about 2007 Jeep Grand Cherokee Overland
Please i really need help
Posted by Anonymous on
2007? WK, (i own a 2010 with all docs)
it dont work at all like a 1993, back in the day of running power through switches to run things.,
or with banks of relays, to fail.
every year,less relays like we did long ago in industry, (pure electronics)
i deleted all my fsm quotes.
it's to wordy.. (but accurate to a fault)
it's now networked + brains (puters),
the network map is below.
if you look at said map, the CAN-BUS network.
is a 2 wire, network for all communications
saving a ton of wire. (times all WK made world wide)
What happens is , you turn the switch
and it has this binary/resistance mux logic in the switch that goes to the SCM brain.
the SCM knows what you did, and converts your actions into a data stream, "a command".
to the can-bus.
it arrives, (if lucky)
to the FCM and the cluster brain CCN. (IP)
the cluster sees that and flashes the click sonic device, and flashes the blinker icon, lamps.
If you can't heare that ,this means the command was never arrived.at CCN.
the FCM hears this command and it in turn drives
the blinker bulbs on the 4 external lamps.
does hazards work, that be first fact to know..
and that FCM fuses, must not be bad.
we scan it next. to see if there are errors
on the can-bus.
or FCM sees garbled data
or CCN errors.
or more.... lots more,
or FCM not responding,
the FCM is over $800 so doing the diagnosis correctly can save a lot of cash.
guessing here can exceed $2000.
here are the can-buss signals, (using my scope)
wanna Gue$$ or Test.?
Posted on May 08, 2016
Bad flasher relay. Does your hazards work if not replace relay. Get back to me on this
Posted on May 08, 2016
I just changed both bulbs in my 1998 Grand Cherokee. These solutions made it possible, but i will offer some clarification and photos. First of all, all 4 screws are torx T20 as emoesmoe mentions, none are phillips. there are two bulbs that blink: the larger amber bulb is the turn signal light--dealer was cheaper than autozone and only had to purchase one bulb; the other bulb is called a side marker and it also blinks with a turn but stays on with the headlights. see photos that go along with the first two solutions. the first photo shows step one the first screw to take out. second and third photo are step two removing the second screw. the last photo shows the exposed screws to the turn signal housing after the uper light houseing has been removed:
Posted on Mar 12, 2009
Tips for a great answer:
Jul 03, 2014 | 2007 Jeep Grand Cherokee
Apr 26, 2012 | 2000 Jeep Grand Cherokee
Dec 06, 2010 | 2001 Jeep Grand Cherokee
Nov 06, 2009 | 1994 Jeep Grand Cherokee
Oct 15, 2009 | 1997 Jeep Grand Cherokee
Aug 12, 2009 | 2000 Jeep Grand Cherokee
Jan 26, 2009 | 2000 Jeep Grand Cherokee
Jan 11, 2009 | 1993 Jeep Grand Cherokee
Jul 22, 2008 | 1994 Jeep Grand Cherokee
105 people viewed this question
Usually answered in minutes!