Reset service indicator

If the 4WD service light comes on when you start your Hummer H2, it could indicate a problem with the four-wheel drive system. This warning light could indicate a problem with the transfer case, the drive shaft, the front or rear differential, or other components of the 4WD system.
It is recommended to take your vehicle to a certified mechanic or a Hummer dealership for proper diagnosis and repair. The service light coming on could be a sign of a serious problem, and it is important to address it promptly to avoid further damage to your vehicle and ensure safe operation.

so what 4wd system is there, we can guess that.
ever.
part time, or AWD full time.
if part time stop doing that on pavement free of ice .
part time is for ice or dirt only
to be real tech savvy , on PT, it means, one tire on ice or dirt.
only.
lost the operators guide, ? in the glove box?
its here.
posted over 300 times.
http://www.jeep.com/en/owners/manuals/


read page 226 yet.?
4WD Indicator - Vehicles Equipped with
Command-Trac (its part time, 4wd for ice or dirt only)

SERV (Service) 4WD Indicator Light - If Equipped
The "SERV 4WD Indicator Light"

page 230
4WD Indicator - Vehicles Equipped with
Selec-Trac II
read page 322 carefully for this,,,
full time, but not in LOCK.!!!!

why not post a photo of your 4wd controls
and then get real savvy answers.
sorry cant guess, what opted 4wd came with your car.
lacking photos....

Hummer 4wd service light reset Questions & Answers - Fixya

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Hummer h2 2003 55000 mill ... service 4wd the liht is on all time Remote the battery wire from the car for 20 ... My 2006 H3 will not come out of 4 wheel drive?

Hi there:
The FDCM has a code, and for me to be able to correctly diagnose your vehicle..You will need to get that code retrieved by a scantool.\.

The service 4WD indicator gives an indication to the vehicle operator when the Final Drive Control Module (FDCM) has recorded a Diagnostic Trouble Code (DTC) for an electronic transfer case circuit or component malfunction. This indicator is controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received by the cluster from the FDCM over the Controller Area Network (CAN) data bus.

The service 4WD indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the OLED service 4WD indication will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the service 4WD indicator for the following reasons:

Service 4WD Indicator Lamp-On Message - Each time the cluster receives an electronic service 4WD indicator lamp-ON message from the FDCM, the service 4WD indicator will be illuminated. The indicator remains illuminated for about five seconds, until the cluster receives a lamp-OFF message from the FDCM, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.

The FDCM continually monitors the electronic transfer case control circuits and transfer case shift motor/mode sensor assembly to determine the condition of the system. The FDCM then sends the proper lamp-ON or lamp-OFF message to the instrument cluster, also known as the Cab Compartment Node (CCN).

For proper diagnosis of the FDCM, the CCN, the CAN data bus or the electronic communication related to service 4WD indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

This sounds like the factory service light what is the mileage?

The Service 4wd indicator illuminates when there is a problem with the 4wd system (its the "check engine light" for your 4wd system)
There will be a diagnostic trouble code stored
Most likely scenario...the module is bad (thats the switch on the dash) but have it diagnosed before throwing a part at it

I would advise you to check your fuses in the block under the hood and on the driver's side of your dash. If that doesn't fix your problem, you probably need a new transfer case selector motor. A quality aftermarket replacement can be purchased for around $250, and is fairly easy to change. Hope this helps!

The fuse number is

#16 - 5 Amp (Tan)

Gauges & Indicator Lights: Low Oil Light, Low Washer Light, Service Reminder Light, Transmission Oil Light, Brake Warning Light, Anti-Lock Brake Warning Light, Fuel Pacer Light, 4WD Indicator Light, Malfunction Indicator Light, Warning Buzzer, Overdrive Switch (1992-93); Transmission Oil Temperature Lamp, 4WD Lamp, Overdrive Module Seat Belt Warning Buzzer
(1994-95).

i had the same problem in my 99,i replaced the switch assembly on the dash and all is well,hope this helps

I have a 2002 chevy trailblazer LT 4.2 l w/ approx 85000 miles on it and I left key in car after rolling down windows for about 2 hours drainging battery. After charging battery and running car for a little bit the service 4 wheel drive light came on. I have had no problems with the truck and I am wondering if it is because the battery was drained and the computer needs to be reset or something?