Did something stupid, now having electrical issues
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Cross-Country
Joined: Dec 2009
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Did something stupid, now having electrical issues
I had to jump start my 2005 Expedition. I was in a hurry, and didn't pay enough attention and hooked the cables up backwards on the trunk.
Now I am having some electrical issues.
The dome light doesn't work, I was able to turn on the front map lights by pushing on them, but now that doesn't work either.
The radio doesn't work, the release for the rear glass doesn't work and the 4 wheel drive doesn't work and the 4x4 high and 4x4 low lights flash when it is running.
So I obviously damaged something, but I am not sure where to start looking.
I checked the fuses and they are good, plus the rear window is on the same fuse as the power windows and they work.
Any help would be appreciated.
Now I am having some electrical issues.
The dome light doesn't work, I was able to turn on the front map lights by pushing on them, but now that doesn't work either.
The radio doesn't work, the release for the rear glass doesn't work and the 4 wheel drive doesn't work and the 4x4 high and 4x4 low lights flash when it is running.
So I obviously damaged something, but I am not sure where to start looking.
I checked the fuses and they are good, plus the rear window is on the same fuse as the power windows and they work.
Any help would be appreciated.
Fleet Owner
Joined: Apr 2008
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For this you'll need to go to the dealer and have them hook up their diagnostic equipment. It sounds like one or more modules have blown and only their equipment will be able to tell you which ones are not communicating with the others.
Posting Guru
Joined: Dec 2014
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Boy, this could get expensive, at the very least I'd say the instrument cluster is affected, this controls the dome lights. Depending on what it shows about the 4x4 is real or a false readout due to it being damaged, then the 4x4 system might be affected which is integral in the PCM unit. The radio is fairly self contained. In addition you have a few more modules.
If you want to save a trip to the dealer, you can try to get an OBD2 scanner and use it with FORScan which is free on Windows, costs 5 bucks on iOS or Android. The best OBD2 scanner for this is the ODBLink MX, but it will run you about 99 bucks, but at least you'll have it for future use rather than handing that money over to the dealer.
If you want to save a trip to the dealer, you can try to get an OBD2 scanner and use it with FORScan which is free on Windows, costs 5 bucks on iOS or Android. The best OBD2 scanner for this is the ODBLink MX, but it will run you about 99 bucks, but at least you'll have it for future use rather than handing that money over to the dealer.
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Cross-Country
Joined: Dec 2009
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Thanks, I remembered about FORScan yesterday.
I got the following codes in the instrument cluster module, B1318-20, U2013-60, U1900-60.
I think the main ones are the B1318 low voltage and the U1900 CAN Bus receive error. The other one is for the compass not responding, but the truck doesn't have a compass display anyway.
I also got a U1900 on the ABS module which if I understand how the 4x4, especially the auto setting, works could cause the 4 wheel drive to not work.
The other errors was another low voltage on the Restraint Control Module, I am not sure if that is from the battery going dead, or a new issue. The other RCM one is a sensor that has been an issue for a while.
I did find this about basic CAN bus troubleshooting. NO Communication and wiring problem solutions for 2005 Ford F150 vehicles!
Although I don't have time to work on it this week, it at least gives me a direction to go in.
I am assuming the Instrument Cluster Module is part of the instrument cluster?
I got the following codes in the instrument cluster module, B1318-20, U2013-60, U1900-60.
I think the main ones are the B1318 low voltage and the U1900 CAN Bus receive error. The other one is for the compass not responding, but the truck doesn't have a compass display anyway.
I also got a U1900 on the ABS module which if I understand how the 4x4, especially the auto setting, works could cause the 4 wheel drive to not work.
The other errors was another low voltage on the Restraint Control Module, I am not sure if that is from the battery going dead, or a new issue. The other RCM one is a sensor that has been an issue for a while.
I did find this about basic CAN bus troubleshooting. NO Communication and wiring problem solutions for 2005 Ford F150 vehicles!
Although I don't have time to work on it this week, it at least gives me a direction to go in.
I am assuming the Instrument Cluster Module is part of the instrument cluster?
Posting Guru
Joined: Dec 2014
Posts: 1,792
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There is a compass display in the instrument cluster, but that's not important for driveability.
The U1900 errors indicate communication issues. If it's indicated on the ABS module, that may indicate that the ABS module was damaged by the power surge. It's unlikely that it's a wiring problem if it worked normally just before you hooked the battery up in reverse. I wouldn't worry about the low voltage codes, those are normal when you've had a flat battery, write down all the codes you have and which modules they belong to, then clear the codes and see what comes back. If the battery is good now, I'm sure the low voltage codes won't come back.
The U1900 errors indicate communication issues. If it's indicated on the ABS module, that may indicate that the ABS module was damaged by the power surge. It's unlikely that it's a wiring problem if it worked normally just before you hooked the battery up in reverse. I wouldn't worry about the low voltage codes, those are normal when you've had a flat battery, write down all the codes you have and which modules they belong to, then clear the codes and see what comes back. If the battery is good now, I'm sure the low voltage codes won't come back.
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Cross-Country
Joined: Dec 2009
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Thanks for the info. I cleared the codes and the u1900 came back on the ABS and the IC modules, so looks like I need to replace the ABS module and the instrument cluster.
On the plus side, it looks like I can get both of them for about $100 on Ebay, so not too expensive of a fix, just my time to put them in.
On the plus side, it looks like I can get both of them for about $100 on Ebay, so not too expensive of a fix, just my time to put them in.
Posting Guru
Joined: Dec 2014
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Before you do that, check if the ABS module and the instrument cluster is receiving all the 12+ inputs and that all the grounds are present. Might be something in the power delivery which is causing the malfunctions after the power surge. If 12+ and GND is present on all the necessary pins and you still get a communication error, and of course making sure that the network wires are properly connected and has continuity, then the problem is most likely internally in the modules. Depending on your skill level with electronics, it may or may not be easy to fix the damage in the modules. Reverse polarity or power surges usually don't damage the entire module, it's usually limited to the power inputs and voltage regulator circuits on the board.
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