Question about 1993 Jeep Grand Cherokee

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Computer message service 4wd switch

Computer message service 4wd switch

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This is common in jeeps i researched the same thing for mine becuase mine flashes but most everyone says its pretty much a dummy light and alot of people have replaced the information center in there jeeps and still had the same problem so i just let it be it doesnt really bother me to much.

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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4 wheel will not work. the selector switch will show it is in but front tires will not engage No messages on control center


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Jan 21, 2016 | 2008 Chevrolet Tahoe LTZ

1 Answer

Service 4wd please give me some ideas


Well your mistake was letting them work on it they like to dink people around because they know whats wrong with there computer gadget my thoughts are the plug for the switch try to pull it out and then when you have this issue see if you can wiiggle some wires to see if theres a faultly connection... by the way mechanics prey for and on people like you with multiple codes going for the ones they can claim as the problem even tho they haave had this same issue before but they wont tell you that

Oct 05, 2012 | 2002 Chevrolet Silverado 2500HD

1 Answer

1998 Chevy Suburban - service 4wd light comes on after running 4x4 for 2 mins


Well it could be the selector switch, but I doubt it.
Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities.
The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash.
You should be able to have a shop scan the body computer for trouble codes and proceed from there.
A basic code reader may not access the body computer.

Jul 05, 2012 | 1999 GMC Suburban

1 Answer

Service 4wd bad accelerator


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.

Jun 23, 2012 | 2000 Chevrolet Blazer

1 Answer

My abs light is on along with my parking brake? How do I fix that? also my service 4wd keeps showing up in the message center but it goes into 4wd fine? Also my a/c does not blow hard or cold?how do I fix...


adjust switch or replaced it and disconnect post battery and wait few minute until computer clear it self and for a/c check your blow fan and check your freon.

Mar 29, 2011 | 1999 Chevrolet K1500

1 Answer

Service 4wd light on when switched to 4wd hi mode


This means theres a problem with the 4wd, you will need to scan the computer to the trany to see whats going on, may be a soleniod problem or a switch, when ever the computer sees a problem and turns on a service light it stores a code in memory telling you what the problem is, a scan tool is needed to retrive the codes.

Jan 12, 2011 | 2000 GMC Yukon

2 Answers

Service 4wd


If you had the switch and encoder motor replaced 5 months ago, then you have warranty. You need to return to the dealer and have them pull codes to see if it is the C0327 again. Some of these trucks also had grounding issues for the 4wd module. If it is the same c0327 code stay on them and make them confirm their original diagnosis.

Nov 23, 2008 | 2005 Chevrolet Silverado 1500HD

2 Answers

Service 4wd switch


remove switch and spray it with contact cleaner, insure the switch is operational and 4wd engages, it may be dirty, when completed disconnect battery for 15 min and see if message comes up again.

Nov 08, 2008 | 1996 Jeep Cherokee Country

1 Answer

Message center states service 4wd


not sure about the fuel gauge, but I am willing to bet you need a new 4wd switch. This is pretty common on these trucks.

The fuel thing might be a bad cluster. This is also a common problem on the gm vehicles. I have 2 silverados, an impala and a malibu and they all have had funky problems with the clusters.

Brew

Jun 13, 2008 | 2000 Chevrolet Silverado 1500

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