Lighting Module: what it does and what each make calls it

What does this module do?

The lighting module drives exterior lighting and monitors lamp circuit current. With LED and matrix headlights each segment is driven separately, so this module carries more codes than a conventional bulb system.

What do the makes call this module?

The name of a module doing the same job changes from make to make. The names below are the actual definition names used under this type in the CarCoding scan map (63 distinct names):

Module name	Address
AHLM Headlamp Leveling (29-bit)	`18DA71F1`
Adaptive Driving Beam LCU	`18DA71F2`
Adaptive Driving Beam Left	`18DA72F2`
Adaptive Driving Beam Right	`18DA73F2`
Adaptive Front Lighting	`75C`
Ceiling Light Module	`17FC1626`
Ceiling Light Module	`17FC1626`
Central control for digital matrix light (MEB/EVO)	`17FC009B`
Central control for digital matrix light (MEB/EVO)	`17FC009B`
Dynamic front left turn signal (MEB/EVO)	`17FC1767`
Dynamic front left turn signal (MEB/EVO)	`17FC1767`
Dynamic front right turn signal (MEB/EVO)	`17FC1768`
Dynamic front right turn signal (MEB/EVO)	`17FC1768`
FLM (Front Lighting)	`18DA70F1`
FL_L/FMPL	`770`
FL_R	`771`
HCM	`734`
HCM (Headlamp Control)	`734`
HLM_LT (29-bit)	`18DA23F3`
HLM_RT (29-bit)	`18DA24F3`
Headlamp (2019-)	`606`
Headlamp Control Module	`734`
Headlamp Levelling / AFS	`6B7`
Headlamp leveling (29-bit)	`18DA80E0`
Headlight Control Module B	`7C3`
Headlight Range Control	`754`
Headlight Range Control	`754`
Headlight control left 2 (MEB/EVO)	`17FC0096`
Headlight control left 2 (MEB/EVO)	`17FC0096`
Headlight control right 2 (MEB/EVO)	`17FC0097`
Headlight control right 2 (MEB/EVO)	`17FC0097`
Headlights	`747`
High Beam Assist	`730`
High Beam Assist	`730`
High Beam Assist (alt)	`748`
High Beam Assist (alt)	`748`
High Beam Lighting System	`751`
Hospitality Light ECU	`18DA70F2`
Interior Light Module 2	`17FC1739`
Interior Light Module 2	`17FC1739`
Interior light module (MEB/EVO)	`17FC161E`
Interior light module (MEB/EVO)	`17FC161E`
LED Driver Left Headlamp	`597`
LED Driver Right Headlamp	`5B7`
LED Headlamp Powermodule 2 Left	`17FC160C`
LED Headlamp Powermodule 2 Left	`17FC160C`
LED Headlamp Powermodule 2 Right	`17FC160D`
LED Headlamp Powermodule 2 Right	`17FC160D`
Left Headlamp Module	`650`
Left Headlamp Power Output Stage	`17FC1614`
Left Headlamp Power Output Stage	`17FC1614`
Left Headlamp control (29-bit)	`18DA42E0`
Left LED headlight control 1 (MEB/EVO)	`17FC160A`
Left LED headlight control 1 (MEB/EVO)	`17FC160A`
Left tail lamp 1 (MEB/EVO)	`17FC1625`
Left tail lamp 1 (MEB/EVO)	`17FC1625`
Left tail lamp 2 (MEB/EVO)	`17FC170E`
Left tail lamp 2 (MEB/EVO)	`17FC170E`
Light Control Left	`17FC0082`
Light Control Left	`17FC0082`
Light Control Right	`17FC0083`
Light Control Right	`17FC0083`
Light Switch	`17FC1603`
Light Switch	`17FC1603`
Matrix Headlamp Powermodule 1 Left	`17FC166B`
Matrix Headlamp Powermodule 1 Left	`17FC166B`
Matrix Headlamp Powermodule 1 Right	`17FC166C`
Matrix Headlamp Powermodule 1 Right	`17FC166C`
Projection module in left matrix headlamp (MEB/EVO)	`17FC0098`
Projection module in left matrix headlamp (MEB/EVO)	`17FC0098`
Projection module in left matrix headlamp (MEB/EVO)	`17FC0099`
Projection module in left matrix headlamp (MEB/EVO)	`17FC0099`
RLM (Rear Lighting)	`18DA2BF1`
RL_L/TL_L/TL_R/CIL	`721`
Rain Light Recognition Sensor	`17FC1602`
Rain Light Recognition Sensor	`17FC1602`
Rear Lamps / BAAST	`732`
Right Headlamp Module	`656`
Right Headlamp Power Output Stage	`17FC1615`
Right Headlamp Power Output Stage	`17FC1615`
Right Headlamp control (29-bit)	`18DA7FE0`
Right LED headlight control 1 (MEB/EVO)	`17FC160B`
Right LED headlight control 1 (MEB/EVO)	`17FC160B`
Right rear tail lamp 1 (MEB/EVO)	`17FC170F`
Right rear tail lamp 1 (MEB/EVO)	`17FC170F`
Right rear tail lamp 2 (MEB/EVO)	`17FC1710`
Right rear tail lamp 2 (MEB/EVO)	`17FC1710`
Seatbelt reminder / Lighting Module	`723`
Smart Beam	`18DA75F1`
Smart Light 2	`1804002D`
Smart Light 2	`1804002D`
Smart Light 3	`1804002E`
Smart Light 3	`1804002E`
Smart Light 4	`18040032`
Smart Light 4	`18040032`
Smart Light 5	`18040033`
Smart Light 5	`18040033`

Which makes define it?

The map holds 97 definitions for this type, spread across 13 make groups:

Address and protocol

Every definition in the map is marked as UDS. 24 of the addresses are 11-bit CAN identifiers (three digits, such as 7E0) and 73 are 29-bit extended identifiers (such as 18DA10F1). The most frequent addresses for this type are: 734 (3), 17FC0082 (2), 17FC0083 (2), 17FC0096 (2).

An address being defined in the map does not mean the module can be read on every vehicle. Reaching modules outside the mandatory OBD-II emissions channel depends on the manufacturer protocol and on the vehicle itself.

Related fault codes

Fault codes stored in this module usually belong to these groups:

Looking for what a fault code means? Fault code library.

Other module types

← All ECU modules

Lighting Module on your own vehicle

With an ELM327-based BLE OBD2 adapter, CarCoding scans the vehicle’s modules, reads fault codes from those it can reach and explains every code in plain language. Which modules are reachable depends on the make and on the vehicle. The app is free to download.

Download on the App Store Get it on Google Play

Some advanced features require an in-app purchase.

Data source: the CarCoding ECU scan map (ecuDatabase.ts). The addresses and names in the table are definitions from the map; they can differ depending on the hardware and software version in your vehicle.

Disclaimer: This page offers general information and does not replace an inspection by a qualified workshop. Any work carried out on the vehicle is your own responsibility.