[szefuncio512]

Hi,
I replaced the LM1 with an LM2 in a 2005 E61.
The car originally had adaptive xenon headlights, but I replaced them with standard non-adaptive LCI xenon headlights.
The rear lights are still pre-LCI.
After coding $522 and making a few manual coding changes, the front xenon headlights work perfectly. The rear lights also work, except for the rear position/tail lights.

The rear position lights come on for about 20 seconds, then they switch off and I get an error in iDrive.
I also get iDrive error messages for:

position lights — they work for about 20 seconds, then switch off and an error appears
brake lights — they work normally, but iDrive still reports a fault
rear turn signals — they work, but flash very fast as if a bulb was missing

What I’m trying to achieve is a fully working setup with:
LCI front xenon headlights + pre-LCI rear lights + LM2.

The main issue is getting the rear position/tail lights to stay on instead of being switched off after about 20 seconds.

I didn’t change any pins when installing the LM2. I just plugged the LM2 into the existing LM1 wiring

Has anyone done this combination before, or knows which LM2 coding/PWM/pin configuration settings are needed for pre-LCI rear lights?


errors from tool32
---------------------------------------

Date:      02.09.2026 14:26:00
ECU:      LM_AHL_2
JobStatus: OKAY
Variant:  LM_AHL_2

---------------------------------------
RESULT: 7 error in error memory !
---------------------------------------

A8B9 - Schlusslicht/Bremslicht rechts defekt

Signal oder Wert oberhalb Schwelle
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: A8 B9 61

---------------------------------------

A8B8 - Schlusslicht/Bremslicht links defekt

Signal oder Wert oberhalb Schwelle
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: A8 B8 61

---------------------------------------

9CB6 - LWR-Spulenabriss

kein Signal oder Wert
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: 9C B6 64

---------------------------------------

A8C5 - Tagfahrlicht rechts defekt;
RR02: Begrenzungslicht rechts defekt

kein Signal oder Wert
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: A8 C5 64

---------------------------------------

A8C3

E63/E64 bis 09/07, E65:
Fahrtrichtungsanzeiger rechts vorne 2 defekt

E60/E61 ab 03/07:
Bremslicht rechts innen defekt

RR US:
Fahrtrichtungsanzeiger rechts hinten 2 defekt

kein Signal oder Wert
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: A8 C3 64

---------------------------------------

A8C4 - Tagfahrlicht links defekt;
RR02: Begrenzungslicht links defekt

kein Signal oder Wert
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: A8 C4 64

---------------------------------------

A8C2

E63/E64 bis 09/07, E65:
Fahrtrichtungsanzeiger links vorne 2 defekt

E60/E61 ab 03/07:
Bremslicht links innen defekt

RR US:
Fahrtrichtungsanzeiger links hinten 2 defekt

kein Signal oder Wert
Testbedingungen erfüllt
Fehler momentan vorhanden und bereits gespeichert
Fehler würde kein Aufleuchten einer Warnlampe verursachen

Error code: A8 C2 64

=======================================

[Emelint]

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 Mon for 1st time.

---

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 min for 1st time.

---

---

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 min for 1st time.

---

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 Mon for 1st time.

[szefuncio512]

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 Mon for 1st time.

---

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 min for 1st time.

---

---

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 min for 1st time.

---

Just code out cold/hot check and report from turn signal 2 (it is BFD), turn on toggle sense resistor for rear turn signal and correct pwm for rear turn signal and rear standing lights. It's ёд5у, 5 Mon for 1st time.

i believe i did that for every light (brake, turn and standing) and still doesnt work
but i will check again

[Emelint]

You can give me your TRC file, I'll check.

[dumitru.o]

2005 what month? post the VIN here, it s important. you modified the month/year in the VO?

you should code the module with 03/05 whatever month you have in 2005.

i hope you did added (and re pinned) the wires for the xenon headlights modules as the adaptive ones have less wires......otherwise your headlights won t move up-down