Headlight switch off delay, function - GF82.10-P-2011FL

MODEL 212.0 /2 up to 28.2.13 

Function requirements, general 

• No overvoltage or undervoltage (operating voltage range U ≥ 7 ≤ 17.5 V)
• "Ambient illumination" function activated in "Settings" menu under "Light" in the instrument cluster (A1)
• Rain/light sensor (B38/2) signals "Darkness detected"
• Exterior lights switch (S1) in position "A"

Headlamp switch-off delay (SWA), general 

The SWA is used for leaving and finding the vehicle safely in darkness by switching on the vehicle's exterior lights (ambient illumination).

The SWA function is comprised 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) 

After the driver switches off the engine (change in status of circuit 15 ON to circuit 15R ON) the SWA function is then requested.

The following information is evaluated by the front SAM control unit with fuse and relay module (N10/1) for output of the headlamp switch-off delay function:

• Activated SWA function, sent by the instrument cluster via interior CAN (CAN B)
• Status of circuit 15, sent by the electronic ignition lock control unit (N73) over interior CAN
• Status of rain/light sensor read in via wiper/inside rearview mirror LIN (LIN 2)
• Status of exterior lights switch via instrument panel LIN (LIN 1) in model 212.0 up to 30.11.09 except model 212.077, and read in directly in model 212.077, 212.2 and model 212.0 as of 1.12.09)

After switching off the engine, the ambient illumination is switched on for a fixed time interval of t = 60 s. The time interval starts again by opening a vehicle door. The trunk lid (model 212.0) or the liftgate (model 212.2) is considered a vehicle door. If all vehicle doors are closed again, this time interval is limited to t = 15 s.

The status of the front doors is sent by the left front door control unit (N69/1) or the right front door control unit (N69/2), the status of the rear doors, the trunk lid or the liftgate is sent by the rear SAM control unit with fuse and relay module (N10/2) over the interior CAN to the front SAM control unit.

The front SAM control unit evaluates all of the relevant information and transmits the request to switch on the ambient illumination via interior CAN to the following control units:

• Rear SAM control unit
• Left front door control unit
• Right front door control unit
• Trailer recognition control unit (N28/1) (with code (550) Trailer hitch)

The front SAM control unit actuates the following ambient illumination components:

• Left front lamp unit (E1)
  • Left front standing light and parking light (E1e3)
• Right front lamp unit (E2)
  • Right front standing light and parking light (E2e3)
• Additionally in vehicles 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):
  • Left xenon bulb with integrated ignition module (E1e10)
  • Right xenon bulb with integrated ignition module (E2e10)

The left xenon bulb with integrated ignition module is actuated by the left xenon light control unit (E1n1) and the right xenon bulb with integrated ignition module by the right xenon light control unit (E2n1).

• Additionally, in vehicles with code (498) Japan version up to 31.5.10 or without code (615) Bi-xenon headlamp unit with integrated curve illumination and without code (616) Bi-xenon headlamp unit with integrated asymmetric curve illumination and without code (621) Intelligent Light System (left-hand traffic) and without code (622) Intelligent Light System (right-hand traffic):
  • Left front fog lamp (E5/1)
  • Right front fog lamp (E5/2)
• Additional with code (460) Canada version or code (494) USA version:
  • Left front side marker lamp (E6/1)
  • Right front side marker lamp (E6/2)

The following ambient illumination components are actuated by the rear SAM control unit:

• Left rear lamp unit (E3)
  • Outer left brake light and taillight (E3e11)
  • Outer left background light (E3e15)

• Inner left rear lamp unit (E3/1)
  • Inner left brake light and taillight (E3/1e4)
  • Inner left background light (E3/1e6)

• Right rear lamp unit (E4)
  • Outer right brake light and taillight (E4e11)
  • Outer right background light (E4e15)

• Inner right rear lamp unit (E4/1)
  • Inner right brake light and taillight (E4/1e4)
  • Inner right background light (E4/1e6)

• Left license plate lamp (E19/1)

• Right license plate lamp (E19/2)

The left front door control unit actuates the left outside mirror ambient lamp (M21/1e1) in the left outside mirror (M21/1). The right front door control unit actuates the right outside mirror ambient lamp (M21/2e1) in the right outside mirror (M21/2). The trailer recognition control unit actuates the following components of the trailer lighting over the trailer socket (X58):

• Taillamps and parking lamps
• License plate lights

In model 212.0 up to 30.11.09 except model 212.077, briefly switching on circuit 15 after switching off the engine makes it possible to leave the vehicle without activating the headlamp switch-off delay (SWA).

The active headlamp switch-off delay is immediately terminated 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 

When unlocking the vehicle using a radio frequency or infrared, the ambient illumination is switched on for a period of t = 40 s (time for the automatic relocking). The electronic ignition lock control unit sends the status of the central locking via interior CAN to the front SAM control unit.

The front SAM control unit evaluates this and sends the "ambient illumination ON" request over interior CAN to the rear SAM control unit, the front door control units and the trailer recognition control unit. The components of the exterior lights are actuated as described for the headlamp switch-off delay function.

The locator lighting (AFB) function is terminated when a door is opened, when circuit 15C is switched on or when an ATA [EDW] alarm system alarm is triggered.

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)		PE82.10-P-2062-97DAA
	Overview of exterior lights system components		GF82.10-P-9998FL