Hummer H2 2004,ignition on, the reversing camera is activated and the display stays on even while the vehicle is running. The reversing light normally operates without problems.

Your half way there. All you need is a wiring diagram to trace the wire from the ignition to that fuse. Most likely it is one wire from the ignition, then it splices to the different fuses. In my experience the splice fails(corrosion), Some times you loose one area, some times all. Depends on which side of the splice is corroded the most. Splices are hard to find. Even harness diagrams can be as much as 2 feet off. I usually find the color code of the wire and run a new wire. In your case, it would be from the ignition switch to the fuse panel.

Circuit/System Description
When the transmission is placed into REVERSE, a 12 volt signal is sent to the rearview camera image display module indicating that camera operation is requested. The rearview camera image display module then supplies ignition voltage and ground to the rear vision camera. The rear vision camera sends video information through the rearview camera image display module to the inside rearview mirror through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

Rearview Camera Image Display Module (UVC)
In the instrument panel behind the driver side knee bolster to the right of the steering column
Do you know how to do electrical testing ?

Rear Vision Camera System Does Not Display
Ignition OFF, disconnect the harness connector at the rear view camera image display module.
Test for less than 1.0 ohm between the ground circuit terminal 3 and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
? If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
Ignition ON, park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the control circuit terminal 1 and ground.
? If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
Ignition OFF, connect the harness connector at the rear view camera image display module. Disconnect the harness connector at the rearview camera.
Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the rear view camera image display module.
Ignition ON, park brake applied, vehicle in REVERSE, test for 5.8-6.2 volts between the 6-volt reference circuit terminal A and ground.
? If less than the specified range, test the 6-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear view camera image display module.
? If greater than the specified range, test the 6-volt reference circuit for a short to voltage. If the circuit tests normal, replace the rear view camera image display module.
Ignition OFF, disconnect the harness connector at the rear view camera image display module.
Test for less then 1 ohm between the shield ground circuit terminal 10 at the rear vision camera display module harness connector and terminal D at the rear vision camera harness connector.
? If greater than the specified range, test the shield ground circuit for an open/high resistance.
Ignition ON, test for less than 1 volt between the signal circuit terminal 9 and ground.
? If greater than the specified range, test the signal circuit for a short to voltage.
Test for infinite resistance between the signal circuit terminal 9 and ground.
? If not the specified value, test the signal circuit for a short to ground.
Test for less then 1 ohm between the signal circuit terminal 9 at the rear vision camera display module harness connector and terminal C at the rear vision camera harness connector.
? If greater than the specified range, test the signal circuit for an open/high resistance.
Ignition OFF, disconnect the harness connector at the inside rearview mirror.
Ignition ON, test for less than 1 volt between the following signal circuits at the inside rearview mirror harness connector and ground:
• Video + signal circuit terminal 6
• Video - signal circuit terminal 7
Test for infinite resistance between the following signal circuits at the inside rearview mirror harness connector and ground:
? If greater than the specified range, test the signal circuit for a short to voltage.
• Video + signal circuit terminal 6
• Video - signal circuit terminal 7
? If greater than the specified value, test the signal circuit for a short to ground.
Test for less then 1 ohm between the following signal circuits:
• Signal circuit terminal 12 at the rearview camera image module and terminal 6 at the inside rearview mirror.
• Signal circuit terminal 11 at the rearview camera image module and terminal 7 at the inside rearview mirror.
? If greater than the specified range, test the signal circuit for an open/high resistance.
If all circuits test normal, test or replace the rear vision camera.
Ignition ON, park brake applied, vehicle in REVERSE, verify a clear rear vision image is displayed on the radio.
? If a clear rear vision image is not displayed, test or replace the inside rearview mirror

IMMO cuts fuel. that is its job, fix that secuity system.
the FSM covers this.
if you tried both the key fobs , that came with car?
do so... now....!

if not why not?
are you using only a single key , to test this? do so.
no other keys near ignition switch.
do have this, the oper guide?
page 14?

http://justgivemethedamnmanual.com/jeep/jeep-compass-owners-manuals/

next is to read the IMMO sections (immoblizer) in FSM
or alldata.com to find true cause of IMMO tripped.

quote page 14, (it's clear , no?)
SENTRY KEY
The Sentry Key Immobilizer System prevents unauthorized
operation of the vehicle by disabling the engine.
The system will shut the engine off after 2 seconds of
running if an invalid key is used to start the vehicle. This
system utilizes ignition keys which have an electronic
chip (transponder) embedded into them. Only keys that
have been programmed to the vehicle can be used to start
and operate the vehicle.
The Sentry Key Immobilizer System does not need to be
armed or activated. Operation of the system is automatic
regardless of whether or not the vehicle is locked or
unlocked. During normal operation, the Theft Alarm/
Immobilizer Light will come on for three (3) seconds
immediately after the ignition switch is turned on for a
bulb check. Afterwards, if the bulb remains on, this
indicates a problem with the electronics.
If the bulb begins to flash after the bulb check, this
indicates that an invalid key has been used to start the
vehicle. Both of these conditions will result in the engine
being shut off after two (2) seconds of running.
Keep in mind that a key which has not been programmed
is also considered an invalid key even if it is cut to fit the
ignition lock cylinder for that vehicle.
If the Theft Alarm/Immobilizer Light comes on during
normal vehicle operation (vehicle has been running for
longer than 10 seconds), a fault has been detected in the
electronics and the vehicle should be serviced as soon as
possible.
14 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
end qoute:

there is many contacts in the ignition switch sounds like the switch is bad

Hello Stacy, My name is Mike. I am thrilled that you choose me to help you with your problem. I am sorry, it took me a few hours to get back to you. I have been helping other customers. Here is where I am with this on your cranking and not starting issue. Oh, by the way great job on your part eliminating some of the other potential suspects.

First of all, I try and tackle the easiest things first,to see if we get lucky.

Pull the start/run relay out for a couple minutes, then put it back in and reset it might reset the passlock box and start right up.

Now, why did I say that? I believe your problem is with your Passlock indicator.( which has to do with your anti theft system)The way I just described is a 50/50 chance to have it work, but don't worry. I always have a plan B and C.

Here is some questions to your symptoms: Stay with me now, wait for it.

Perform the re-learning procedure

Turn ON the ignition, with the engine OFF.

Attempt to start the engine, then release the key to ON (vehicle will not start).

Observe the SECURITY light, after approximately 11 minutes the light will turn OFF.

Turn OFF the ignition, and wait 10 seconds.

Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( the vehicle

is now ready to relearn the Sensor Data Code and/or passwords on the next ignition switch transition from OFF

to CRANK).

Important: The vehicle learns the relearns Sensor Data Code and/or password on the next ignition switch

transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

Start the engine (the vehicle has now learned the Sensor Data Code and/or password).

Here is Plan C as promised, but I personally would not suggest, Even though GMC offers a bypass procedure.

Link for a Bypass Solution:

http://newrockies.com/installation-instructions/hummer/h2/2003-hummer-h2/

Plan D, would be have to check into possibility of bad ECM, but lets hope that is just a worst case scenario.

Thanks So Much,Mike. Please Keep Me Informed of progress.

not the wiring here thats at fault i think but the bulbs are loose or fitted in the wrong way around

Hi!
You did not specify the yr and model of your vehicle, but the procedure is the same, remove the tail light assembly as specified on your owners manual to replace a light bulb. Apply the Parking Brake and turn the ignition switch to the RUN position (do not start the vehicle), press the brake pedal and place the Shifter in REVERSE. Remove the Reverse light bulb and use a test light grounded to the vehicle chassis to find which one of the two wires going into the reverse light socket is the 12v+, once located, replace REVERSE light bulb, place shifter lever in PARK and turn key OFF.
Splice the 12v+ wire and connect the 12v+ lead from your camera to it, get your Ground (-) from the vehicle chassis.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

My 2006 Hummer H3 is not coming out of lock position. Indicator light says its in the normal 4 wheel drive but it doesn't feel like that when i am making a hard turn. I tried driving in reverse as well as letting it sit in the garage overnight. What is prob?

This is the problem with faulty reverse light switch which is in the transmission, replace the switch it will the problem ...

Good luck....

i know gms have a light sentinal in the dash. when it says it's dark out, it will automaticaly turn your lights on. dose your hummer have one? if so, try cleaning it off.