SOLVED: Bed Lamp works left side only

[SilverPigeon]

Hi all, when I picked up my KR late last year, one item that they needed to address was the right side bed lamp not coming on when the left came on. Switch or zone lighting, same behaviour.

When I got the truck back, the dealer said it was an invalid configuration in the BCM. I immediately backed up my BCM configuration in FORScan when I got home. It has worked up until last Friday, when I again got it back from a service. They said they had performed some software updates and I'm guessing the BCM was one. Probably not the most recent one as I'm so far behind in updates (I will fix that in FDRS soon).

I have tried the following to fix it, all to no avail:
1. Re-seated the right side bed lamp connector
2. Re-booted the BCM in FORScan
3. Saved the BCM config and compared it to a previously good config from last May - matched.
4. Re-wrote the BCM config from last May and compared with last Friday's BCM config from the dealer service - matched
5. Re-booted the BCM again.
6. Checked FORScan easy mode config and disabled, set lamp type to none. Re-enabled those two options.
7. Checked as-built line by line wrt bed lamps - all good.

I am at the stage of believing that there is some procedure in FDRS that resets the BCM config or operation in a way that FORScan can't. If anyone knows anything more, I'd be grateful for the help.

P.S. I did search everywhere on the forum for "bed lamp" and "bed lamp switch", but the only discussions are around neither bed lamp working ?‍

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[fordtruckman2003]

I would be inclined to think it is a wiring issue if one works and one does not. Weird that it would be software related. When you reseated connector do you mean under the bed or on the back of the light? I assume they already tried swapping left and right lights to rule out the light itself.

 

[SilverPigeon]

I would be inclined to think it is a wiring issue if one works and one does not. Weird that it would be software related. When you reseated connector do you mean under the bed or on the back of the light? I assume they already tried swapping left and right lights to rule out the light itself.

Re-seated the connector at the back of the light only at this stage. The reason I think it's software related is that the first time they fixed it that's what they said was wrong. This time there was nothing for them to fix, but when I picked it up, it was not working again. It would be an incredibly bad coincidence for it to turn out to be wiring related this time, but I'll at least try more connectors and swapping the light units over and report back. Thank you ?

 

[fordtruckman2003]

I agree would be strange coincidence. The situation makes no sense at all so could be anything is my thought. Theads on adding bed lights mention up to 4 lines to change for them to work. Others say they had them working with only 2 lines.

 

[SilverPigeon]

I agree would be strange coincidence. The situation makes no sense at all so could be anything is my thought. Theads on adding bed lights mention up to 4 lines to change for them to work. Others say they had them working with only 2 lines.

All set correctly there and no changes from when the lights did work properly, which is why I'm thinking something can be done in FDRS, maybe (but hopefully short of) a PMI ?‍

 

[SilverPigeon]

Ok, weather is better tomorrow for checking the wiring and swapping the lights. Today I did some more searching and in another forum Jesse fixed Saleen's both lights not working by changing
726-50-02 1107-5064-034E - WLCC TRAILER to
726-50-02 1107-5064-044F - WLCC BED_LAMP

The very last character before the checksum is WLCC. Even when my lights were working properly, it was set to 3. I tried changing it to 4 and both lights stopped working, so I don't know what's going on with that setting, except 4 doesn't exist on the 2024 BCM, so maybe my 2023 BCM is a later than normal BCM ?‍. I will look for other inconsistencies and do the physical stuff ?

 

[fordtruckman2003]

I'm sure you'll get it figured out but I'm also a bit confused how it isn't something for dealer to sort out. I know you paid a lot of money for the truck and the right drive conversion. Seems they should have given you truck 100% working. ?‍

 

[SilverPigeon]

I'm sure you'll get it figured out but I'm also a bit confused how it isn't something for dealer to sort out. I know you paid a lot of money for the truck and the right drive conversion. Seems they should have given you truck 100% working. ?‍

All true, but the dealer is an hour and a half away, then they'll send it to the converter company to address and it'll be back in my hands in a few weeks. If it turns out to be software, I'll know what to do so that those weeks are avoided. Certainly if I can't find the solution, I'll have no choice; but it's such a small matter that I would then get it addressed at the next service ?

 

[fordtruckman2003]

Hope you find it.

I think you posted you plan to update with FDRS so maybe that will help resolve it as well once you get it done. Only the latest BCM update isn't able to install. Older updates as far as I know still install.

 

[SilverPigeon]

Found it. Thank you @fordtruckman2003 for making me investigate the other connectors in the line; the connector at the bottom of the under-bed loom (which goes to the bed light only) was not seated and latched, but loose. I was not able to latch it successfully so the dealer can fix that next service ?.

What made me waste all that time in FORScan was the fact that everyone else has
726-50-02 1107-5064-044F - WLCC BED_LAMP
to make their bed lamps work, but mine only work with
726-50-02 1107-5064-034E - WLCC TRAILER.
It's definitely a 2023 BCM because the 2024 BCM has different addresses for the bed lamp configuration. My guess is that because they have customised the trailer connections for Australian plugs, they've had to make some other changes in the BCM or the TRM. Chalk up another point of uniqueness for me ?

 

[fordtruckman2003]

Dang that is unfortunate it doesn't connect together properly. Probably have to order the wiring harness for it or at least the connector.

 

[SilverPigeon]

I turned on the bed light switch, got the boss to look while I pressed the plug into the socket, she saw it light up. I turned the lights off, unhooked the socket (larger loom) from the mount and cleaned all around the gap between the socket and its sheath, examined the latch, all looked fine. The plug looked fine, including the ramp that the latch clicks over, but try as I might, I could not get it to latch. I then got the boss to confirm operation as before and left it sitting unlatched for them to fix ?

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