Windshield intermittent wiping, function

P82.30-2358-09

Shown on rain sensor (B38)

up to 31.5.03

A1 Instrument cluster

B38 Rain sensor (with code (345a) rain sensor up to 31.5.03)

B38/2 Rain/light sensor (with code (345a) rain sensor as of 1.6.03)

M6/1 Wiper motor

S4 Combination switch

S17/3 Left front door contact switch

S17/4 Right front door contact switch

S62 ATA hood switch

A Reading in of combination switch (S4) up to 30.6.03

B Reading in of combination switch (S4) as of 1.7.03

CAN-B Controller area network bus
class B (interior compartment) (CAN B)

N10/1 Front SAM control unit with fuse and relay module

N10/1kL Wiper relay, stage 1-2

N10/1kQ Wiper ON and OFF relay

N10/2 Rear SAM control unit with fuse and relay module

N70 Overhead control panel control unit

N73 DI control unit

N80 Steering column module

Function prerequisites:

 Circuit 15R ON

 Engine hood and front doors closed

Operating procedure

 The intermittent wiping function can be switched on by turning the combination switch (S4) to position "I".

 The position of the combination switch (S4) is read by the EIS control unit (N73) or the steering column module (N80) and is relayed as a message to the CAN-B.

 The front SAM control unit with fuse and relay module (N10/1) receives this message and triggers a wiping cycle (if the wipers were already in motion, this wiping operation is first completed).

 After a wiping cycle the wiper motor (M6/1) is braked.

 The intermittent pause is started.

 After expiration, the intermittent pause of the next wiping operation is started.

-----------------------------------------------------------------------------------------

Control of wiper motor

The front SAM control unit with fuse and relay module (N10/1) actuates the wiper motor (M6/1) via the wiper stage 1 and 2 relay (N10/1kL) and the wiper ON/OFF relay (N10/1kQ) so that the wipers are operating in speed 1.

Interruption of intermittent pause

If another wiper function is requested during an intermittent pause, this function is executed without taking the intermittent pause into consideration. After completion of this function, the intermittent pause is started again.

Intermittent pause function on vehicles without code (345a) rain sensor

Regardless of the wetting degree the intermittent pause time is

approx. 5 s

-----------------------------------------------------------------------------------------

Intermittent pause function on vehicles with code (345a) rain sensor

The intermittent pause is dependent on the degree of wetting of the windshield. In order to achieve this, the front SAM control unit with fuse and relay module (N10/1) evaluates the data from the rain sensor (B38) or the rain/light sensor (B38/2).

The data exchange between the front SAM control unit with fuse and relay module (N10/1) and the rain sensor (B38) or the rain/light sensor (B38/2) takes place viar the CAN-B. The overhead control panel control unit (N70) serves as interface.

If the rain sensor (B38) or the rain/light sensor (B38/2) fail, then the intermittent time is set to approx. 5 s.