Hello, looking for help. My AC clutch, radio, cruise control, and turn signals are not working. I have checked all fuses and relays that I can find, all good. From what I have read, these are not part of the GEM function. Does anyone know what I need to check next!
Thanks

 

This is a 2002 4x2 ranger pickup

 

Welcome to FTE.

Use your ELM327 scan tool running FORScan on the viewing device of your choice as discussed here https://www.ford-trucks.com/forums/1...-scantool.html to have a in depth look for computer/controller trouble code clues by being able to scan All of the vehicle computer/controllers & then post All code Numbers, as they can help focus your trouble shoot.

Is this a auto tranny & did the problems come about suddenly after some event, or slowly over time?

Is this a flood vehicle?

Do you have lit or blinking CEL/SES/ABS/OD light/s? If so & you don't have a scan tool, or don't want to wait to come by the ELM scan tool, most auto parts stores will scan for codes at no charge, but most of their code readers can't do an in depth scan, as they only look at the engine computer/controller.

 

I changed the passenger side mirror. Wire matched right up. Simple plug and same colors. I will take it by the parts store and see if they will scan it. I know Auto Zone will. I have sense unplugged the mirror I change an still have the problem. No blinking of the lights. I found a relay board under the dash, all which test good. All these problems can't be from one fuse unless it is a feeder to another fuse block. I am a I&E, the electrical is easy, just finding the place to look. One guy at the parts store told me it was the GEM, after research, do not read where these functions are controlled by the GEM.
Thanks for your reply, and any other thoughts would be very helpful!

 

Carey:My AC clutch, radio, cruise control, and turn signals are not working.

The radio and turn signals are controlled by the GEM/SJB depending on year. The 'keep powered' after key OFF function is a GEM product. There is a relay that provides radio power, along with power window power, for a time after you turn off the engine. If that quits working, no power will be provided.
I do not have a clue as to why changing the power mirror had any effect on GEM operation.
I don't have the schematic to know the color of the 'power' wires for the individual items, but some are definitely routed through the GEM. The turn signal circuits along with the CHMSL are operated by the GEM. The cruise control is either GEM or ECM, but interfaces with the brake switch or combination switch that cuts cruise when the brakes are applied.
Have you used a VOM to check voltage across the individual fuses? The plastic-shrouded fuses have a little square opening you can probe w/o removing the fuse, and there should be zero volts across them if the fuse is conducting.
tom

 

As tomw posted, the GEM does have a say in these systems operation & strangely enough so apparently does the auto tranny TRS=Transmission Range Selector, so the reason for my question on which tranny you have!!!

The inexpensive ELM scan tool running FORScan or the like software can take a in depth look into the various computer/controllers for trouble code clues on where best to look next, so can be a real help on numerous problems as you seem to have, so imo it's worth the low cost & slight trouble to come by one. Makes a really nice tool for our electronic tool box, that can pay for itself on its first use, the one I broke down & bought back in 2011 sure did!!!!

Again, did the problems come about suddenly after some event & is this a flood vehicle???

Here is a link you can use by entering your Ranger particulars, to view various system electrical pictorials & wiring color codes that might prove helpful in your trouble shoot. Search Wiring Diagrams

As you likely well know, ground loops can cause all sorts of strange anomalies in computer controlled systems & is another reason for my is it a auto tranny question.
So make sure All of your electrical cable connections, especially grounds, are clean, bright & tight. Thus, B+ to the under hood drivers side firewall power distribution box & B- battery to engine & body & body to engine grounds should be closely inspected, cleaned & tightened & checked for under load voltage drop, if you haven't already done so.

More thoughts for consideration, let us know how your trouble shoot goes.

 

Go to the "Tech Info" thread atop this forums thread index page & click to open it & scroll down to the "Miscellaneous" section to find GEM info & open it. Scroll down to posts 7 & 8 by Ken00 to read about what all the GEM does.

 

Thanks for info. Will do. Gonna get by my parts store and see if they will scan it. Will update findings. Thanks again!