Left front door control unit, component description

P72.29-2352-04

N69/1 Left front door control unit

Location

The left front door control unit is located in the upper area of the left door inside.

Task

The left front door control unit is connected with the controller area network bus class B (interior compartment) (CAN-B) for exchanging data and has the following purposes:

Scans the switches:

 Power window and outside mirror adjustment switch group, driver (S20/1):

- Rear side windows child safety lock switch (S20/1s5)

- Outside mirror fold-in/out switch (S20/1s9)

- Outside mirror adjustment rocker switch (S20/1s12)

- Open vent window switch (S20/1s15)

- Close vent window switch (S20/1s16)

- Outside mirror adjustment switch (S50)

 Open and close switch for rear-end door, driver (S15/3)

 Left interior CL switch (S85/5)

Reads in sensors:

 Left front IR receiver (A26/1)

 Hall sensor for left front power window motor (M10/3)

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 Mirror up/down adjustment potentiometer (M21/1r2)

 Mirror in/out adjustment potentiometer (M21/1r3)

Switches loads via internal semi-conductor switches:

 Left outside mirror turn signal lamp (E6/5)

 Left front door entrance/exit lamp (E17/3)

 Left front door inside handle illumination (E17/11)

 Left front power window motor (M10/3)

 Left front door CL motor (M14/6)

 Left electrically adjustable and heated outside mirror (M21/1)

 Left outside mirror ambient lamp (M21/1e1)

 Automatic mirror dimming (M21/1h1)

 Mirror fold-in motor (M21/1m3)

 Mirror heater (M21/1r1)

 Illumination for power window and outside mirror adjustment switch group, driver

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 The power window and outside mirror adjustment switch group, driver is read in by the left front door control unit via a LIN-BUS.

 The left interior CL switch and the open and close switch for rear-end door, driver is read in voltage-coded by the left front door control unit.

Purpose in connection with air conditioning system

The left front door control unit senses the window position of the left front vehicle door and stores this information on the CAN-B bus.

The AAC control and operating unit (N22) or comfort AAC control and operating unit (N22/7) reads in the signal for the window position "Driver door ON" to achieve better standard quality in the open position.

Recirculated air convenience closing, purpose

When the air recirculation switch (N22s2 or N22/7s2) is pressed for longer than 1.5 s, the convenience closing function is activated.

The left front door control unit stores the momentary window position and closes it, if open, in the automatic mode.

When the convenience closing function is completed, the window is returned to the stored position when the air recirculation switch is pressed for longer than 1.5 s.