Why won't Reverse lights work no matter what I do?

I have 2010 and all books on jeeps, (88 to 2010)
did you check all fuses first (small)?
what transmission, AUTO?
mine has NAG1,(german MB made)
my answers are only USA , not else where, and you never told that. WJ model jeep it is. unless Diesel.
2wd or 4wd drive? may not matter but... not told

4.7s came 5-45rfe transmissions ( reverse TRS) reverse
PRNDL switch must close for R or there will be no reverse lamps but the gear shift works, and drives reverse so.
did you forget to scan the PCM (TCM) with a scan tool and see OMG TRS errors? first,???
the car moves in reverse but the reverse pressure sensor is bad
or the backup fuse. F20 named. blew.

I'd look first after fuse for trailer hitch wring hacks, sure would
then scan the PCM next.
this is not 1980 with old easy to fix bad external TRS switches.


I have the real service manual
the PRNDL in R, the box goes to R and drives
but the pressure switch (or fuse) in the box that signals I am in REVERES is failing, Scan it and see what's up?
get a shop to scan the PCM even for free.


from the factory real service manual above schematic;.
the fuse must be good F20. ok>? if is scanning is next.

the shifter tells the TCM to go to Reverse
the Rev solenoid, energizes and is tested to see it did at SOL pins
then the reverse clutch closes and car moves in reverse.
the TCM quickly sees if the Pressure for sensors, agrees it is REVERSE and fails the back up lamp fails and DTC errors are stored.
not scanning the PCM you miss all of that.
it is a double fail safe design, and also rules the park lockout too.
if fuse is good the switch left side is failing or OMG all reverse lamps are burned out or the wire to them are cut
a tech checks all that out, using a voltmeter and is covered in the




output above
input sense below

Have you checked the fuse and the switch for power ?

Check the trailer hitch tap connector in the frame near the rear bumper for corrosion. Use dielectric grease and reconnect the connector

if you changed the right fuse then you could have a bad neutral switch not working to turn on the reverse lights or power or ground is lost going to the bulbs either a bad wire or bad sockets this will have to be checked out with a test light.

COULD HAVE WRONG TYPE LIGHT BULBS.YOUR TRUCK USE COMBINATION LIGHT BULBS.

Did you check for power at the fuse? Have you applied power to the fuse from the battery to see if the lights work?

There is a small plasic acess cover (1/2" x1/2") on the base of the shifter. Pry it open and press the button. You should immediately be able to shift. The button is needed because the sensor on your brake pedal is broken (won't activate your brake lights either). Use the button on your shifter to get your car home or to the mechanic so you can get the brake switch fixed. Remember whern you drive you have no brake lights. -Mark

Have you checked under the hood in the engine compartment? I do believe there is a fuse box there with fuse for the brake/reverse.

have you tryed crossing out the starter ? thar are fused wires that goes to the starter . you might have to use a test light

wires are pinched and shorting together near the left (drivers side) trunk hinge. brake light power is feeding back through the reverse light wiring. this will also turn on the check engine light with a neutral safety switch malfunction code as the computer also sees this voltage in the reverse light circuit. Find and repair the wiring, pull the EFI fuse in the panel under the hood to clear the code. Hope this helps