Automatic interior lights control, function - GF82.20-P-2200LE
MODEL 216.3, 221.0/1 as of model year 09/YoM 08
Automatic interior lights control in general
The automatic interior lights control implements the actuation of all components of the interior illumination as well as actuation of the warning and exit illumination.
The corresponding requests are generated automatically. The master control unit for the automatic interior lights control is the overhead control panel control unit (N70).
The automatic interior lights control feature comprises the following subfunctions:
- Locator lighting function sequence
- Function sequence for warning and exit illumination
- Function sequence for trunk illumination
- Function sequence for interior illumination with ATA [EDW] alarm (with code (551) Antitheft alarm system (ATA [EDW]))
- Function sequence for interior illumination following an accident with airbag deployment
Additional function requirements for locator lighting
- Door contact ON and OFF switch (N70s3) in automatic interior lights position
- Rain/light sensor (B38/2) reports darkness
- Vehicle unlocking via the central locking system (CL [ZV]) or
- Intentionally leaving the vehicle by removing the transmitter key (A8/1) from the EIS [EZS] control unit (N73)
Locator lighting function sequence
To control the ambient illumination, the following information is read in and evaluated by the overhead control panel control unit:
- Door contact ON and OFF switch status
- Rain/light sensor status
- Status of central locking (CL [ZV]) and circuit 15 status from EIS [EZS] control unit via the interior CAN
The overhead control panel control unit directly actuates the following interior illumination components:
- Front dome lamp (N70e1)
- Left coat hook lamp (E15/24) and Right coat hook lamp (E15/25) (with model 216)
- Left rear interior lamp (E11/1e1) and Right rear interior lamp (E11/2e1) (for model 221)
If the function is requested by unlocking the central locking, the interior illumination is switched off after t = 30 s or immediately, if the vehicle is locked again within t = 3 s of unlocking it.
If the function is requested by intentionally leaving the vehicle, the interior illumination is switched off in accordance with the OFF delay time that has been set via the front central operating unit (A40/9). The duration of the OFF delay time can be set and is sent by the instrument cluster to the central CAN. The central gateway control unit (N93) makes this signal available to the rear SAM control unit on the interior CAN.
The overhead control panel control unit then sends the request to switch on the footwell illumination via the interior CAN to the upper control panel control unit (N72/1) and on model 221 left front seat control unit (N32/1), front right seat control unit (N32/2).
The upper control panel control unit actuates the following footwell illumination components:
- Right front footwell lamp (E17/15)
- Left front footwell lamp (E17/16)
The left front seat control unit actuates the left rear footwell lamp (E17/18) and the right front seat control unit actuates the right rear footwell lamp (E17/17).
Additional function requirements for warning and exit illumination
- Opening a vehicle door
Function sequence for warning and exit illumination
To control the warning and exit illumination, the following signals are read in and evaluated by the overhead control panel control unit via the interior CAN.
Model 216:
- Status of left rotary tumbler switch (A85s1), supplied by the left door control unit (N69/1)
- Status of right rotary tumbler switch (A85/1s1), supplied by right door control unit (N69/2)
Model 221:
- Status of left front rotary tumbler switch (A85s1), supplied by the left front door control unit (N69/1)
- Status of right front rotary tumbler switch (A85/1s1), supplied by the right front door control unit (N69/2)
- Status of left rear rotary tumbler switch (A85/3s1), supplied by the left rear door control unit (N69/3)
- Status of right rear rotary tumbler switch (A85/4s1), supplied by the right rear door control unit (N69/4)
The overhead control panel control unit transmits the switch-on request for the warning and exit illumination as well as the footwell illumination via the interior CAN to the following control units:
- Door control units (model 216)
- Front door control units (model 221)
- Rear door control units (model 221)
- Upper control panel control unit
- Front seat control units (for model 221)
The following warning and exit illumination components are actuated by each door control unit to match the door status.
Model 216:
- Entrance and exit lamp in left door (E17/3)
- Right door entrance/exit lamp (E17/4)
Model 221:
- Left front door entrance and exit lamp (E17/3) - Right front door entrance and exit lamp (E17/4)
- Left rear door entrance and exit lamp (E17/5) - Right rear door entrance and exit lamp (E17/6)
- Front left door warning lamp (E17/19) - Rear left door warning lamp (E17/20)
- Front right door warning lamp (E17/21)
- Rear right door warning lamp (E17/22)
The overhead control panel control unit also actuates the following interior illumination components:
- Front dome lamp
- Coat hook lamps (for model 216)
- Rear interior lights (with model 221)
The upper control panel control unit actuates the front footwell lamps and, on model 221, the front seat control units actuate the rear footwell lamps in each case with a 100% brightness value.
If all vehicle doors are closed again and if the EIS [EZS] control unit supplies the circuit 15 ON terminal status to the interior CAN, the interior illumination is then switched off.
The footwell lamps are then actuated again at the set brightness value for the symbol illumination.
To preserve the on-board electrical system battery (G1), with a circuit status of circuit 15 Off all activated lights are switched off after t = 5 min and when a vehicle door is opened, or t = 8 s after the closing of the last vehicle door.
Additional load compartment illumination function requirements
- Vehicle stationary
- Trunk lid opened
Function sequence for trunk illumination
To regulate the trunk illumination the status of the trunk lid rotary tumbler microswitch (M14/7s3) is read in and evaluated by the rear SAM control unit with fuse and relay module (N10/2). The rear SAM control unit controls the right trunk lamp (E18/4), left trunk lamp (E18/5), the left trunk lid ambient and warning lamp (E40/2), right trunk lid ambient and warning lamp (E40/3) to match this particular status.
To preserve the on-board electrical system battery, the power supply of the trunk lamp is interrupted after t = 30 minutes if the trunk lid is opened.
Additional function requirements for interior illumination with ATA [EDW] alarm
- ATA [EDW] alarm activated
Function sequence for interior illumination with ATA [EDW] alarm
The rear SAM control unit transmits the "ATA [EDW] alarm triggered" signal via interior CAN to the overhead control panel control unit. The overhead control panel control unit sends the request to switch on the footwell illumination via the interior CAN to the upper control panel control unit and, for model 221, also to the front seat control units. The following interior illumination components are actuated:
- Left reading lamp (A67e1)
- Right reading lamp (A67e2)
- Front dome lamp
- Coat hook lamps (for model 216)
- Rear interior lights (with model 221)
The upper control panel control unit actuates the front footwell lamps. The front seat control units actuate the rear footwell lamps.
Additional function requirements for interior illumination following an accident with airbag deployment
- Airbag deployment through the restraint system control unit (N2/7)
- Vehicle stationary
Function sequence for interior illumination following an accident with airbag deployment
The interior illumination is actuated in order to provide better orientation for the occupants and the first air personnel following an accident.
The "crash event" information is sent by the restraint system control unit to the chassis CAN and forwarded by the central gateway control unit to the interior CAN.
The overhead control panel control unit receives this information, then sends the request to switch on the footwell illumination via the interior CAN to the upper control panel control unit and, if necessary, also to the front seat control units.
The following interior illumination components are actuated:
- Reading lamps
- Front dome lamp
- Coat hook lamps (for model 216)
- Rear interior lights (with model 221)
The upper control panel control unit actuates the front footwell lamps. The front seat control units actuate the rear footwell lamps. The interior illumination function following an accident with airbag deployment is deactivated under the following conditions:
- Hazard warning system button (A40/9s3) pressed
- Unlocking the CL [ZV]
- Change in circuit status from circuit 15R to circuit 15 On
- Opening a vehicle door
| Automatic interior lights control electrical function schematic | Model 216 | PE82.20-P-2052-97CAA | |
| Model 221 | PE82.20-P-2052-97SAA | ||
| Front central operating unit, component description | A40/9 | GF54.21-P-4500LE | |
| Restraint systems control unit, component description | N2/7 | GF91.60-P-4048LE | |
| Rear SAM control unit with fuse and relay module, component description | N10/2 | GF54.21-P-6030LE | |
| Left front seat control unit, component description | N32/1 | GF91.29-P-5230LE | |
| Right front seat control unit, component description | N32/2 | GF91.29-P-5240LE | |
| Left door control unit, component description | N69/1 Model 216 |
GF72.29-P-4124LA | |
| Left front door control unit, component description | N69/1 Model 221 |
GF72.29-P-4141LE | |
| Right door control unit, component description | N69/2 Model 216 |
GF72.29-P-4128LA | |
| Right front door control unit, component description | N69/2 Model 221 |
GF72.29-P-4142LE | |
| Rear door control unit, component description | N69/3, N69/4 Model 221 |
GF72.29-P-6020LE | |
| Overhead control panel control unit, component description | N70 | GF82.20-P-5216LE | |
| Upper control panel control unit, component description | N72/1 | GF54.21-P-6040LE | |
| Component description for the EZS control unit | N73 | GF80.57-P-6003LE | |
| Central gateway control unit, component description | N93 | GF54.21-P-4170LE | |
| Inside rearview mirror unit, component description | A67 | GF68.49-P-2105LE |