Electrical Funk - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 05-19-2015
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Electrical Funk

These issues are on my '04 Ranger.

1. Wipers don't seem to function properly. They will only work on low and high setting and they will not park themselves. I have tried a new motor and have put a new switch in it.

2. The driver auto down does not work. I hear a click in the passenger foot panel when I hit the down button, but the auto down doesn't work. The window rolls down fine as long as you hold it down; just the auto function doesn't work.

Any ideas.
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Old 05-20-2015
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I see adsm08 point you at the GEM(BCM-body control module)

Yes, that would be best place to go for auto-window issue, wiper issue could have been switch but when window is added, GEM is the issue
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Old 05-20-2015
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Originally Posted by RonD View Post
I see adsm08 point you at the GEM(BCM-body control module)

Yes, that would be best place to go for auto-window issue, wiper issue could have been switch but when window is added, GEM is the issue
Where is the GEM located?

Is one of these what I need?
Fast Shipping Ford Mazda Ranger Gem Multifunction Module XL5T 14B205 EC E | eBay

http://www.ebay.com/itm/04-05-FORD-R...891933&vxp=mtr
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Old 05-20-2015
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Behind the radio usually.

Yes those are GEM(BCM) units.

Because of all of the different option packages these usually need to be matched to the vehicle's VIN, some are plug and play others are not.
You will need the number and software from your GEM to match it, but as said Ford Dealer can reprogram it for your VIN.

From professional mechanics magazine article, regarding BCM replacement
Quote:
A typical example is a Ford GEM module (Generic Electronic Module). Ford started using these in the mid-to-late 1990s in various cars, minivans and light trucks. It is essentially a body control module it terms of what it actually does, though the list of control functions will vary depending on the vehicle application and its options. Some of the control functions include interior lighting, daytime running lamps, power windows, warning chimes and lamps, rear window defroster, windshield wipers and washers, perimeter anti-theft alarm, remote keyless entry and battery saver functions.
If a Ford GEM module has to be replaced (which can happen if water infiltrates and corrodes the electronics inside the black box), it usually requires a part number that is specific to the customer’s vehicle. To further complicate matters, Ford says their GEM modules need to be programmed after they have been installed so they will function correctly. But some are simply plug-n’-play and will work right out of the box.
Many modules on many different makes and models of vehicles do require either reprogramming for a specific vehicle application or VIN code, or have to undergo some type of initialization or learning procedure (which may require a scan tool) after they have been installed before they will function normally.
If a DIY customer doesn’t know this, they may think the replacement module you sold them is no good and bring it back with a warranty claim.

Last edited by RonD; 05-20-2015 at 12:06 PM.
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Old 05-20-2015
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Quote:
Originally Posted by RonD View Post
Behind the radio usually.

Yes those are GEM(BCM) units.

Because of all of the different option packages these usually need to be matched to the vehicle's VIN, some are plug and play others are not.
You will need the number and software from your GEM to match it, but as said Ford Dealer can reprogram it for your VIN.

From professional mechanics magazine article, regarding BCM replacement
I will try to find one from a truck that has the same options.

Will I have to get my PATS keys reprogrammed to match it?
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Old 05-20-2015
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No, PATS disables the engine and isn't part of GEM or alarm system, but............GEM is part of keyless entry I believe, so key fobs may need to be reprogrammed into new GEM.
You can look that up on the internet, I think you need to turn the key on 8 times in 10seconds to enter "program mode" for the fobs.

Every model year vehicle makers change things, even Ford shop mechanics often run into issues on a specific year that wasn't an issue the year before or the year after, so when it comes to the electronics/software there is often no pat answer, no absolutes.
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Old 05-20-2015
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Originally Posted by RonD View Post
No, PATS disables engine and isn't part of GEM or alarm system, but............GEM is part of keyless entry I believe, so key fobs may need to be reprogrammed into new GEM
Good info, thanks.

Reprogramming the keyless entry fobs is easy enough.
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Old 05-21-2015
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I figured out it might not be the BCM. I was holding the driver window button down like I have to on my Silverado. If I just tap it the window rolls down automatically.

Still haven't figured out what the wiper issue might be. Any ideas if that is the ONLY electrical issue?
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  #9  
Old 05-25-2015
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Ok, I've got the wipers to park themselves and work on intermediate. They will ONLY work funky on intermediate.

What they are doing is when you first turn the intermediate on they bump up about 2" and stop. Then they delay to the next time the intermediate is supposed to cycle. From then on they function as they should.

Any ideas on this? I have switched both under hood wiper relays with the fog light relays and both still work. I don't think it is a relay issue. I have replaced the wiper motor and the wiper switch without anything changing.
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