Question about 2008 Jeep Wrangler

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I have a 2008 jeep wrangler and the headlights, indicators and wipers are not working. I tried cleaning the ground lugs on the vehicle as well as swapping out the left multifunction switch and still n

HADLIGHTS INDICATORS AND WIPERS NOT WORKING

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  • Jeep Master
  • 20,706 Answers

Same car as mine.
is battery voltage at 12.6vdc rested?
Do the dash lights (warning) all do there self check key on, ? glow?
I bet you didnt scan it.
btw1: this car is 100% computer controlled, 16 puters. on board.
the first thing to do , is check all fuse for BLOWN.
Fuse J11, J13, J20 is wiper and M30

i use and ohmeter, as fuse can look ok but be bad. (hair cracks)
you skipped the first step in all electrical troubleshooting, fuses.
I have the FULL FSM for this car. we can find any fault.
i also have the scan tool.
i scan the car and see , lots of errors, it will even show a DTC (errors)
for blown fuses, today.

the best way to troubleshoot any car, made, is to fix bad head lights
first. that is because they are so simple.
by law the work keys in pocket, way more easy to trouble shoot that.!
the are also hot at all times, (less fuses ) and power comes
directly from the battery, via 1 relay.
How do HL work
the stalk switch is digital, it dont run HL direct like the olden days(pre 07)
the stalk tells the BCM to turn on head lights and the BCM (puter)tells
via the CAN-BUS (network) a command to the TIPM module
in right engine bay, to turn on head lights. (im not kidding)
and this module TIPM sees that command and closes the HL relay
and BAM , head lights happen. even keys in pocket.
in my shop i have a CAN-Bus analyzer (DIY) and can(no pun) see the BCM send the command to the TIPM, so i dont need to test the stalk HL (both the Can and LIN bus)
switch or fiddle grounds risking life or limb with AIR BAG SQUIBS FIRING.. I use my CAN bus tool.
ok , i see that command ,why is the TIPM ignoring it.
i have a 10yo kid throw HL switch and the relay does close.
i see it and hear it, but no HL, i replace it , it still bad.
i find my HL fuse is hair line cracked,
that is why I always use my volt meter to check all fuse.
12v on both sides. means its good, (active circuit this case HL on)
BTW2: the HL stalk switch is in the steering control module
in this car, and the SCM , sends the actual command via the LIN bus
C1-pin3, then the BCM sens the this command out on the can-bus.
the TIPM hears that and the relay CLOSES.
all this can be monitored. guessing is very hard in any system this
complex.
The older cars FSM says, troubleshoot using, conventional ways.
this FSM says opposite.its UN-conventional.

if you need the HL schematic i can send it you, link it.
is page 7363 , HL schem.

yes, all this sucks. but its the future.
im retired, but worked computers from, 1975 to present.
its all SSDD to me, but in cars it's all new...... (networks)
good luck and do defeat those air bags as it says 1000 time in the FSM. for good cause.

Posted on Mar 28, 2014

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