L322 Wierd light fault!

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Lonestar

Member
Posts
63
Location
Cheshire
Hi guys,
Got a strange fault and wondering if any one else has had the same issue. My front n/s angel eyes stay on no matter what I havdmve tried. I have to keep disconnecting the head light so it doesn't drain the battery. I've tried the discon the battery and leaving off, I've gone through every fuse and now I'm now having a brain melt! Help someone please!!!!!
TIA.
 
Tganks for coming back, I have a Lynx II and tried to see if it was a fault with the LCM but only tells me about the levelling as they don't work on the upgrades.
 
My guess is a faulty LCM. When mine went my brake lights came on every time I turned the ignition on until I turned the lights on and off after which they were fine until the next start. Was the LCM replaced for a later version with the upgrade? in which case you will need to swap it for like for like. Also the LCM has a backup for the mileage so if the replacement is higher you will need to recode the corrrect mileage as the car will default to the higher of the 2.
I'm also guessing yours or the LCM came from a car with self leveling headlights which as others say is pointless on a self leveling car.
Self leveling headlights has come up a few times due to the discussions around 3 or 6 wire height sensors.


From RAVE
The exterior lighting is controlled by the Light Check Module (LCM). The LCM controls the following vehicle functions:
Control and monitoring of exterior lamps including direction indicators and hazard warning functionality
Illumination dimmer control of instrument pack and all interior switch illumination
Communication and control and monitoring of trailer lighting via the trailer ECU
Control of power supply to automatic headlamp levelling ECU (only with bi-xenon headlamps option)
Monitoring and evaluation of check control inputs from other system ECU's and output of applicable messages
in the instrument pack message centre.
The LCM is connected to the I Bus and communicates with other vehicle systems via the instrument pack. The LCM
contains a microprocessor which performs the control, monitoring and evaluation functions.
Light Check Module (LCM)
The LCM is located on the RH 'A' post, behind the trim panel. The LCM is connected to the vehicle wiring harness
with three multiplugs.
The LCM receives two permanent battery power supplies via the passenger compartment fusebox and power feeds
from the ignition switch positions I (AUX) and II (IGN).
The lighting circuits are not protected by conventional fuses. The control circuitry within the LCM for each individual
circuit can detect and isolate a problem circuit.
A monitoring system within the LCM can determine a bulb failure and indicate this to the driver via the instrument pack
message centre.
 
Apologies Kermit rr,
The problem I have now has only just occurred and hasn't had a problem since buying the car with conversion already done. The DRLs have never been operational as I beleive there wasn't any kit to adapt them at the time. I have thought it to be the LCM and have used a couple of different readers to see where the fault may be. It tells me the n/s front side light is not on but actually is. The only thing I could think of was a relay stuck on maybe. What do you think guys before splashing out on a new LCM?
TIA.
 
backinblack said:
My guess is a faulty LCM. When mine went my brake lights came on every time I turned the ignition on until I turned the lights on and off after which they were fine until the next start. Was the LCM replaced for a later version with the upgrade? in which case you will need to swap it for like for like. Also the LCM has a backup for the mileage so if the replacement is higher you will need to recode the corrrect mileage as the car will default to the higher of the 2.
I'm also guessing yours or the LCM came from a car with self leveling headlights which as others say is pointless on a self leveling car.
Self leveling headlights has come up a few times due to the discussions around 3 or 6 wire height sensors.


From RAVE
The exterior lighting is controlled by the Light Check Module (LCM). The LCM controls the following vehicle functions:
Control and monitoring of exterior lamps including direction indicators and hazard warning functionality
Illumination dimmer control of instrument pack and all interior switch illumination
Communication and control and monitoring of trailer lighting via the trailer ECU
Control of power supply to automatic headlamp levelling ECU (only with bi-xenon headlamps option)
Monitoring and evaluation of check control inputs from other system ECU's and output of applicable messages
in the instrument pack message centre.
The LCM is connected to the I Bus and communicates with other vehicle systems via the instrument pack. The LCM
contains a microprocessor which performs the control, monitoring and evaluation functions.
Light Check Module (LCM)
The LCM is located on the RH 'A' post, behind the trim panel. The LCM is connected to the vehicle wiring harness
with three multiplugs.
The LCM receives two permanent battery power supplies via the passenger compartment fusebox and power feeds
from the ignition switch positions I (AUX) and II (IGN).
The lighting circuits are not protected by conventional fuses. The control circuitry within the LCM for each individual
circuit can detect and isolate a problem circuit.
A monitoring system within the LCM can determine a bulb failure and indicate this to the driver via the instrument pack
message centre.
Click to expand...
Thank you that.
 
If there is power to one light cluster and not to the other equivalent connector then you'd imagine an LCM problem, but i think you do need perhaps a better/different diag that might dig deeper/ second opinion. Plus a dig through rave to see what should happen
 
I don't know the circuitry but I'd assume each headlight has it's own MOSFET and one of yours either has a short circuit input to output or is permanently triggered and I doubt diags will monitor that.
 
Lonestar said:
Apologies Kermit rr,
The problem I have now has only just occurred and hasn't had a problem since buying the car with conversion already done. The DRLs have never been operational as I beleive there wasn't any kit to adapt them at the time. I have thought it to be the LCM and have used a couple of different readers to see where the fault may be. It tells me the n/s front side light is not on but actually is. The only thing I could think of was a relay stuck on maybe. What do you think guys before splashing out on a new LCM?
TIA.
Click to expand...
No relays these days, all switching is done with MOSFET's
 
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