Auto highbeams not working

[hturnerfamily]

I've seen this same 'non-auto-high beams' from time to time, and actually, we've noticed it on our EV9, also... it seems that the 'auto' part is not remaining active, when it should... the EV9's 'automatic wipers' is just as annoying - it's either on WAY too much and too fast, or doesn't respond AS SOON as it needs to... and, there's no 'middle ground', either... you either have 'auto mode' or you have 'always on'... there is no 'infrequent' wiper option.
While there is a switch that seems to refer to a 'slower' or 'faster' frequency mode, it doesn't seem to change anything, or make any difference.

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[rugedraw]

@KingConan Got your message, but responding here so the info is out there. Your truck is reporting these codes:

First code is citing an open circuit in the lighting driver control module and the other code cites a component internal failure in the HCM for the left headlamp. Both of these are active and not stored codes. Seems like the headlight may be the toast. If the issue was config or software related, the codes would indicate something along those lines.

Codes are only stored for 60 days at a time on the cloud, and these codes have been there for 60 days and more.

 

[KingConan]

@KingConan Got your message, but responding here so the info is out there. Your truck is reporting these codes:

First code is citing an open circuit in the lighting driver control module and the other code cites a component internal failure in the HCM for the left headlamp. Both of these are active and not stored codes. Seems like the headlight may be the toast. If the issue was config or software related, the codes would indicate something along those lines.

Codes are only stored for 60 days at a time on the cloud, and these codes have been there for 60 days and more.

Thank you for providing this detail I really wish the dealership was as sharp and didn't advise me to try the module first as it appears clear its the headlight.

Do both of these trace to the headlamp assembly itself if I was to purchase and replace myself, or is one to the HCM located elsewhere in the truck?

 

[rugedraw]

Thank you for providing this detail I really wish the dealership was as sharp and didn't advise me to try the module first as it appears clear its the headlight.

Do both of these trace to the headlamp assembly itself if I was to purchase and replace myself, or is one to the HCM located elsewhere in the truck?

Hard to say without being able to plug into the truck and run pin-point tests. Some things are obvious and can be diagnosed remotely, but I don't feel comfortable saying for sure it the headlight based on those codes. Maybe @Jesse-Infotainment can chime in and give his opinion.

 

[Jesse-Infotainment]

Have you checked your front low beam if it is working? I have no idea why they even went for the HCM.. This would be either the Headlamp assembly or the LDCMA(Headlight Module)

If the Low beam is indeed working then My best GUESS would be the actual headlight module.

You would need to confirm the low beam situation first though

 

[KingConan]

chime in and give his opinion.

Have you checked your front low beam if it is working? I have no idea why they even went for the HCM.. This would be either the Headlamp assembly or the LDCMA(Headlight Module)

If the Low beam is indeed working then My best GUESS would be the actual headlight module.

You would need to confirm the low beam situation first though

The center light in the stack of the left headlamp always remained working. The upper/lower light in the stack worked for high-beams manual, but would intermittently turn on for low-beam night driving.

 

[Jesse-Infotainment]

The center light in the stack of the left headlamp always remained working. The upper/lower light in the stack worked for high-beams manual, but would intermittently turn on for low-beam night driving.

Ok. that would have absolutely NOTHING to do with the HCM.

That DTC set when It detects a open circuit from the Low Beam LED

So looking at this my GUESS would be the Headlight itself. The DTC points to an Internal Headlamp issue. COuld be a wireing inside the Headlamp.. you can pull the module and inspect the connector.. verify nothing is damaged or has gotten too hot.

 

[Firebelly]

I have exactly this issue. 2022 Lightning Lariat. Forscan gives me B1559 and B1D00.

Like @KingConan , I first noticed the auto high not working; then later noticed the driver side low beam out.

Took it to the dealer, took 2 days just to "run diagnostics" - result of that is they wanted to remove the assembly for $600 to test it more, but saying it would probably need replaced. I said no.

So - I'm looking for

1. Instructions on removing the headlamp assembly on the 22 lightning
2. Either a used headlamp, as long as it doesn't require expert / dealer programming to work, or
3. A 3rd party headlamp if #2 isn't possible

===HCM DTC B1559:96-8A===
Code: B1559 - Left Headlamp

Additional Fault Symptom:
- Component Internal Failure

Status:
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Headlamp Control Module

Freeze Frame #1:
-ECU_POWER_SUPPLY: 14.3 V - ECU Power Supply Voltage
-EVENT_TIME: 111656839 s (Wed Nov 13 22:14:26 2024) - Event time
-HCM_DiagVehMde: 1 - Diagnostic Vehicle Mode

===END HCM===

===LDCMA DTC B1D00:13-2F===
Code: B1D00 - Left Low Beam

Additional Fault Symptom:
- Circuit Open

Status:
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Lighting Driver Control Module A
===END LDCMA===

 

[rugedraw]

I have exactly this issue. 2022 Lightning Lariat. Forscan gives me B1559 and B1D00.

Like @KingConan , I first noticed the auto high not working; then later noticed the driver side low beam out.

Took it to the dealer, took 2 days just to "run diagnostics" - result of that is they wanted to remove the assembly for $600 to test it more, but saying it would probably need replaced. I said no.

So - I'm looking for

1. Instructions on removing the headlamp assembly on the 22 lightning
2. Either a used headlamp, as long as it doesn't require expert / dealer programming to work, or
3. A 3rd party headlamp if #2 isn't possible

===HCM DTC B1559:96-8A===
Code: B1559 - Left Headlamp

Additional Fault Symptom:
- Component Internal Failure

Status:
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Headlamp Control Module

Freeze Frame #1:
-ECU_POWER_SUPPLY: 14.3 V - ECU Power Supply Voltage
-EVENT_TIME: 111656839 s (Wed Nov 13 22:14:26 2024) - Event time
-HCM_DiagVehMde: 1 - Diagnostic Vehicle Mode

===END HCM===

===LDCMA DTC B1D00:13-2F===
Code: B1D00 - Left Low Beam

Additional Fault Symptom:
- Circuit Open

Status:
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Lighting Driver Control Module A
===END LDCMA===

Attached are the instructions from the workshop manual to fist remove the radiator grill and then the headlamp. I don't think swapping out the headlamp alone requires programming; only the modules, but not 100% sure.

 

[Firebelly]

Wow thanks! One thing though, this is a Lightning so it doesn't really have a grille. What "grille" there is, is part of the frunk so when you open the frunk, it's out of the way. Just looking at it, I think I only need to do steps 4 and 4 from the Grille Removal document.

This seems quite doable, so I will likely try to get a replacement first, and then do the R/R.

 

[KingConan]

Well a full headlight replacement fixed the codes and auto high beams and left low beam are all back to functioning normally.

The cost was $2100 most of which was the headlight ($1800). I had searched on eBay and it looked like new headlight could be had for ~$800, and on YouTube there is a video of lightning bumper removal which gets through all the steps to remove the headlight. For me the ~$1K extra cost over doing it myself was worth it for the warranty that comes with the dealer in case it blows or breaks again. That’s the problem I have no idea why this broke.

 

[bmwhitetx]

Wow thanks! One thing though, this is a Lightning so it doesn't really have a grille.

Here is what I believe is the removal for the Lightning. Pretty simple - once you remove the front bumper and frunk!

 

[Firebelly]

Ooooo so - no grille - but frunk and bumper. Crap. Frunk is easy enough. Bumper IDK. I assume you woulda sent it if you have it.

 

[bmwhitetx]

Ooooo so - no grille - but frunk and bumper. Crap. Frunk is easy enough. Bumper IDK. I assume you woulda sent it if you have it.

I'll DM you

 

[Deleted member 21405]

Well a full headlight replacement fixed the codes and auto high beams and left low beam are all back to functioning normally.

The cost was $2100 most of which was the headlight ($1800). I had searched on eBay and it looked like new headlight could be had for ~$800, and on YouTube there is a video of lightning bumper removal which gets through all the steps to remove the headlight. For me the ~$1K extra cost over doing it myself was worth it for the warranty that comes with the dealer in case it blows or breaks again. That’s the problem I have no idea why this broke.

You made a good case for the extended warranty which I did today thanks to this thread. For anyone considering it, get the extra lighting option as well.

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