GF82.20-P-0002GZ Interior Lighting (IBL) Function

GF82.20-P-0002GZ Interior Lighting (IBL) Function

Component Identification:

Function
The interior lights system (IBL) is responsible for illumination of the vehicle interior depending on various factors (e.g. door open). The master control unit for this is the overhead control panel control unit.
In addition to this, the illumination can be switched on and off manually.

Operating possibilities

^ Manual actuation via operating switches
- Front and rear roof lighting
- Front reading lamp

^ When a door is opened the
- roof lighting
- 2nd seat row reading lamps,
- entrance illumination and
- footwell illumination are switched on.

^ If the standing lamp (circuit 58d) is switched on the
- door inside handle illumination and
- search and function illumination are switched on.

^ If the central locking (ZV) is unlocked the
- roof lighting is switched on in dimmed state. Switch-off is 30 seconds after unlocking.

^ If the transmitter key (A8/1) is removed the
- roof lighting is switched on in dimmed state. Switch-off is automatic in line with the run-on time set in the instrument cluster. The run-on time can be set to 0, 5, 10, 15 or 20 s.

^ If the anti-theft alarm system (ATA [EDW]) code 551 is triggered or in the event of a panic alarm (USA only) the
- roof lighting and
- footwell illumination are switched on without dimming.

^ Actuation via contact switch
- vanity mirror illumination
- glove compartment illumination

Illumination

Entrance and exit illumination
With a present "Night" signal from the rain/light sensor and after opening one of the doors, the rear SAM control unit (N10/8) sends a signal over the CAN-B to the overhead control panel control unit. The overhead control panel control unit then sends the switch-on signal to the respective front door control unit, which switches on the corresponding entrance/exit lamp. The rear entrance/exit lamps are actuated by the rear SAM control unit.

Front and rear door inside handle illumination
For circuit 15R on and with a pending "Night" signal from the rain/ light sensor and after switching on the standing lamp (circuit 58d) the
- left front door inside handle illumination (E17/11),
- right front door inside handle illumination (E17/12),
- left rear door inside handle illumination (E17/13) and
- right rear door inside handle illumination (E17/14) are activated.

The front door inside handle illumination is actuated by the respective front door control unit.
Actuation of the rear door inside handle illumination is performed by the rear SAM control unit.

Footwell lights
The rear SAM control unit reads in the status of all vehicle doors. With a present "Night" signal from the rain/light sensor and after opening one of the doors, the rear SAM control unit sends a signal over the CAN-B to the overhead control panel control unit.

In response, the overhead control panel control unit then sends the switch-on signal for the footwell lamps to the front SAM control unit (N10).

Ambient lamps
The ambient lamps integrated into the outside mirrors are actuated by the front door control units. For this purpose, the overhead control panel control unit receives the unlock signal from the EIS [EZS] control unit (N73). The signal to switch on the ambient lamps in the outside mirrors is then sent by the overhead control panel control unit along with the "Night" signal from the rain/light sensor to the door control unit over CAN-B.

Search and function illumination
If the standing lamp is switched on, the brightness of all illuminated controls is automatically adapted by a photo-transistor integrated into the instrument cluster to the level of brightness in the vehicle interior.

The pushbutton switches instrument and controls illumination button, bright (A1s4) and instrument and controls illumination button, dim (A1s5) on the instrument cluster can be used to set the brightness to suit individual needs.

Roof lighting
The roof lighting contains the manual and automatic switching on of the front interior lamps in the overhead control panel control unit and rear dome lamp.

Front reading lamps
By pressing the corresponding switch in the overhead control panel, the attendant reading lamp in the inside rearview mirror unit is switched on undimmed.

Rear reading lamp
By pressing the lens of the reading lamps integrated in the grab handles of the 2nd seat row, the reading lamps are switched on undimmed. They can be switched off by pressing the lens again.

Glove compartment illumination
The glove compartment illumination with switch is switched on when circuit 15R is on by opening the glove compartment. It is switched off by closing the glove compartment or automatically after 15 minutes of bus idle.

Vanity mirror illumination
By opening the mirror cover in the sun visor, the left front vanity mirror illumination switch (S101) or the right front vanity mirror illumination switch (S102) is automatically actuated and the left front illumination or right front illumination is switched off. It is switched off by closing the corresponding mirror cover or automatically 30 minutes after circuit 15 off.

Load compartment lamps
If the rear-end door is opened, the rear SAM control unit receives a signal from the rear door locking unit. If at the same time the rear SAM control unit receives the "Night" signal via CAN-B from the rain/light sensor, then the rear-end door ambient lamp is switched on. At the same time the rear-end door warning lamp is switched on.
The rear-end door ambient lamp is switched off by closing the rear-end door. The rear-end door warning lamp is switched off similarly by closing the rear-end door or also automatically after 10 minutes by the rear SAM control unit.