Headlight switch off delay function - GF82.10-P-2011LE
MODEL 216.3, 221.0/1 as of model year 2009/YoM 08
Function requirements for headlamp switch-off delay (SWA), general
- No overvoltage or undervoltage (operating voltage range U ≥ 7 ≤ 17.5 V)
- Function activated via the COMAND controller unit (A40/3)
- Engine switched off and transmitter key (A8/1) removed
- Rain/light sensor (B38/2) signals "Darkness detected"
- Rotary light switch (S1) in position "AUTO" (with code (494) USA version)
SWA, general
The SWA is used for leaving and finding the vehicle safely in darkness by switching on the vehicle ambient illumination.
The headlamp switch-off delay (SWA) function consists of the following subfunctions:
- Function sequence for headlamp switch-off delay (SWA)
- Function sequence for locator lighting (AFB)
Function sequence for headlamp switch-off delay (SWA)
The following signals are evaluated by the front SAM control unit with fuse and relay module (N10/1) for output of the headlamp switch-off delay function:
- Activated "Locator lighting" function provided by COMAND control unit to the central CAN (CAN F) and relayed by the central gateway control unit (N93) via the interior CAN (CAN B)
- Circuit 15 status provided by the EZS control unit (N73) to the interior CAN
- Circuit 61 status provided by the CDI control unit (N3/9) (on diesel engine) or by the ME-SFI [ME] control unit (N3/10) (on gasoline engine) to the chassis CAN (CAN E).
- Status of rain/light sensor provided by the overhead control panel control unit (N70) to the interior CAN
- Status of rotary light switch (with code (494) USA version) provided by the upper control panel control unit (N72/1) to the interior CAN
After switching off the engine, the vehicle ambient illumination is switched on for an adjustable time interval of t = maximum 60 s. When a vehicle door or the trunk lid is opened, the time interval starts again. When all vehicle doors are closed again, the function is initiated again for the configured time interval.
The time interval can be adjusted in 15 s increments from t = 0 to 60 s.
Status of corresponding vehicle door sent to the interior CAN:
- Model 216:
- Driver door by left door control unit (N69/1)
- Passenger door by right door control unit (N69/2)
- Model 221:
- Driver door by left front door control unit (N69/1)
- Passenger door by right front door control unit (N69/2)
- Left rear door by left rear door control unit (N69/3)
- Right rear door by right rear door control unit (N69/4)
The rear SAM control unit with fuse and relay module (N10/2) sends the status of the trunk lid to the interior CAN.
The front SAM control unit receives all the relevant information, evaluates it and transmits a corresponding signal via the interior CAN to the following control units.
- Left door control unit (model 216)
- Right door control unit (model 216)
- Left front door control unit (model 221)
- Right front door control unit (model 221)
- Rear SAM control unit
- Trailer recognition control unit (N28/1) (with code (550) Trailer hitch)
The following components of the vehicle ambient illumination are actuated by the front SAM control unit:
- Left standing light/parking light (E1e3)
- Right standing light/parking light (E2e3)
For model 216 as of 1.9.10 and with model 221 as of 1.6.09 with code (615) Bi-xenon headlamp unit with integrated curve illumination or code (616) Bi-xenon headlamp unit with integrated asymmetrical curve illumination or code (621) Intelligent Light System (left-hand traffic) or code (622) Intelligent Light System (right-hand traffic) light-emitting diodes (LED) are used for the output of the parking lights and standing light functions instead of conventional bulbs. For this purpose the left standing and parking light voltage converter is located at the bottom of the left front lamp unit (E1) E1n5 and the right standing and parking light voltage converter at the bottom of the right front lamp unit (E2). E2n5 They are supplied with voltage by the front SAM control unit.
- Model 216 up to 31.8.10, model 221 up to 31.5.09, model 216 as of 1.9.10 and model 221 as of 1.6.09 without code (236) Daytime running lights in LED version:
- Left front fog lamp (E5/1)
- Right front fog lamp (E5/2)
- Vehicles with code (494) USA version:
- Left front side-marker lamp (
E6/1)
- Right front side-marker lamp (
- Left front side-marker lamp (
The left door control unit receives the request and actuates the left outside mirror ambient lamp (M21/1e1).
The right door control unit receives the request and actuates the right outside mirror ambient lamp (M21/2e1).
The rear SAM control unit receives the request and actuates the following components in the vehicle's ambient illumination:
- Left brake light, taillight and parking light (E3e9)
- Right brake light, taillight and parking light (E4e9)
- Left license plate lamp (E19/1)
- Right license plate lamp (E19/2)
- Vehicles with code (494) USA version:
- Left rear side marker lamp
- Right rear side marker lamp
- Left rear side marker lamp
The trailer recognition control unit receives the request and actuates the corresponding components for the lighting system on the trailer through the trailer hitch socket, 13-pin (X58).
By briefly switching on circuit 15 after switching off the engine, it is possible to discretely leave the vehicle without activating the headlamp switch-off delay.
The active headlamp switch-off delay is terminated immediately by switching on circuit 15 or by triggering an antitheft alarm system (ATA [EDW]) alarm (with code (551) Antitheft alarm system (ATA [EDW])).
Function sequence for AFB
The vehicle ambient illumination is switched on for a period of approx. t = 40 s when the vehicle is unlocked by means of the transmitter key (A8/1). The EZS control unit transmits the request "Unlock vehicle" via the interior CAN to the front SAM control unit.
The front SAM control unit issues the request "Switch on vehicle ambient illumination" via the interior CAN to the corresponding control units. The components are actuated as described for the headlamp switch-off delay (SWA) function.
The AFB function is terminated by opening a vehicle front door, by inserting the transmitter key into the EZS control unit or by triggering an ATA [EDW] alarm.
The headlamp switch-off delay and locator lighting functions run in parallel if necessary. An active headlamp switch-off delay (SWA) function is not terminated by a requested AFB function and vice versa.
| Electrical function schematic, headlamp switch-off delay (SWA) | Model 216 | PE82.10-P-2062-97CAA | |
| Model 221 | PE82.10-P-2062-97SAA | ||
| Component description for COMAND controller unit | A40/3 With code (526) COMAND with single DVD drive (without navigation system) or with code (527) COMAND APS with single DVD drive (with navigation system) |
GF82.85-P-3136LE | |
| With code (529) HIGH Class Japan | GF82.85-P-3136LEJ | ||
| With code (530) COMAND APS USA (with navigation system) | GF82.85-P-3136LEU | ||
| Component description for CDI control unit | N3/9 Model 221 with engine 629.9 |
GF07.16-P-6000OA | |
| Model 221 with engine 642.8 | GF07.16-P-6000OHS | ||
| Model 221 with engine 642.9 | GF07.16-P-6000OHL | ||
| Component description for ME-SFI [ME] control unit | N3/10 With engine 156 |
GF07.61-P-6000MAS | |
| With model 221 with engine 272 (except 272.974) | GF07.61-P-6000MIS | ||
| Model 221 with engine 272.974 | GF07.61-P-6000MEH | ||
| With engine 273 | GF07.61-P-6000MLS | ||
| With engine 275 | GF07.61-P-6000MOS | ||
| Model 221 with engine 276 | GF07.61-P-6000MMB | ||
| On engine 157, 278 | GF07.61-P-6000MMC | ||
| Component description for front SAM control unit with fuse and relay module | N10/1 | GF54.21-P-6070LE | |
| Component description for rear SAM control unit with fuse and relay module | N10/2 | GF54.21-P-6030LE | |
| Component description for trailer recognition control unit | N28/1 For model 221 with code (550) Trailer hitch |
GF31.19-P-4050LE | |
| Component description for left door control unit | N69/1 Model 216 |
GF72.29-P-4124LA | |
| Component description for left front door control unit | N69/1 Model 221 |
GF72.29-P-4141LE | |
| Component description for right door control unit | N69/2 Model 216 |
GF72.29-P-4128LA | |
| Component description for right front door control unit | N69/2 Model 221 |
GF72.29-P-4142LE | |
| Rear door control unit, component description | N69/3, N69/4 On model 221 |
GF72.29-P-6020LE | |
| Component description for overhead control panel control unit | N70 | GF82.20-P-5216LE | |
| Upper control panel control unit, component description | N72/1 | GF54.21-P-6040LE | |
| EZS control unit, component description | N73 | GF80.57-P-6003LE | |
| Component description for central gateway control unit | N93 | GF54.21-P-4170LE |