3315636 - E3051 ELECTRIC REAR WINDOWS - Functional description
Functional description
The integrated services control unit M40 manages the operation of the electric rear windows. The direct supply for the rear electric windows reaches the control unit M40 at pins 4 and 7 of connector C from the line protected by fuses F61 and F62 of junction unit B45. The ignition-controlled supply (15/54) for M40 arrives via relay T1 and fuse F13 of junction unit B2 at pin 11 of connector B; Pins 3 and 20 of connector C of M40 provide the earth. When the switches are operated, they send the command signals (positive and negative) to control unit M40, but only if the safety switch located in the unit H44 is in the enablement position. If it is not, it cuts off the supply to both the switches on the driver's door and the switches on the rear doors. With the safety switch in the enablement position, the switches are illuminated when the ignition is on (MAR). The block switch is also illuminated when the ignition is on, by a specific LED supplied by the ignition-operated line (15/54) for relay T24 of B45 protected by fuse F78 of junction unit B45:The switches send control signals to control unit M40:
- pins 4 and 9 of device H44 send signals to pins 18 and 20 of connector A of M40, respectively, to operate the left rear electric window in the left front door.
- pins 2 and 8 of device H44 send signals to pins 19 and 17 of connector A of M40, respectively, to operate the right rear electric window in the left front door.
- pins 2 and 1 of the electric window switch in the right rear door H54 send signals to pins 19 and 17 of connector A of M40, respectively, to operate the right rear electric window.
- pins 2 and 1 of the electric window switch in the left rear door H53 send signals to pins 18 and 20 of connector A of M40, respectively, to operate the left rear electric window.
The control unit M40 operates the electric windows on the basis of the logic described previously:
- from pins 8 and 9 of connector C it sends commands to the rear left motor N65.
- from pins 1 and 2 of connector C it sends commands to the rear right motor N66.