Operation

Windows - Front Operation

BCU earth connection
The BCU is earthed from pin C0660-11 on a B wire to earth header C0551.

Front left window up
The left window switch up contact is connected to pin C0660-18 on the BCU by a BS wire. When the switch is set to the up position an Internal supply from the BCU flows along the BS wire through the contacts of the switch and to earth via earth header C0552 on a B wire.

The BCU internal logic monitors the current flow from pin C0660-18 and uses this input as an up signal. The BCU routes power from the permanent feed from pin C0664-7 to pin C0664-4. From pin C0664-4, the power flows to connector interface C0463-6/C0744-6 on an SB wire, and from the connector interface to the LH front window motor on a SU wire. The motor is energised and drives the window mechanism towards the up position.

The front left window motor is earthed via an SK wire to connector interface C0744-7/C0463-7, and an SR wire from the connector interface to pin C0664-1 on the BCU. The BCU completes the earth via pin C0664-5 on a B wire to earth header C0018 LHD/C0017 RHD.

Front left window down
The left window switch down contact is connected to pin C0662-1 on the BCU by a BR wire. When the switch is set to the down position an internal supply from the BCU flows along the BR wire through the contacts of the switch and to earth via earth header C0552 on a B wire.

The BCU internal logic monitors the current flow from pin C0662-1 and uses this input as a down signal. The BCU routes power from the permanent feed from pin C0664-7 to pin C0664-1. From pin C0664-1, the power flows to connector interface C0463-7/C0744-7 on an SR wire, and from the connector interface to the LH front window motor on a SK wire. The motor is energised and drives the window mechanism towards the down position.

The front left window motor is earthed via an SU wire to connector interface C0744-6/C0463-6, and an SB wire from the connector interface to pin C0664-4 on the BCU. The BCU completes the earth via pin C0664-5 on a B wire to earth header C0018 LHD/C0017 RHD.

Front right window up
The right window switch up contact is connected to pin C0660-19 on the BCU by a BU wire. When the switch is set to the up position an internal supply from the BCU flows along the BU wire through the contacts of the switch and to earth via earth header C0552 on a B wire.

The BCU internal logic monitors the current flow from pin C0660-19 and uses this input as an up signal. The BCU routes power from the permanent feed from pin C0664-7 to pin C0664-6, from pin C0664-6 on an SK wire to connector C0326-2 on the RH front window motor. The motor is energised and drives the window mechanism towards the up position.

The front right window lift motor is earthed via an SK wire to connector C0664-2 on the BCU. The BCU completes the earth via pin C0664-5 on a B wire to earth header C0018 LHD/C0017 RHD.

Front right window down
The right window switch down contact is connected to pin C0660-2 on the BCU by a BK wire. When the switch is set to the down position an internal supply from the BCU flows along the BK wire through the contacts of the switch and to earth via earth header C0552 on a B wire.

The BCU internal logic monitors the current flow from pin C0660-2 and uses this input as a down signal. The BCU routes power from the permanent feed from pin C0664-7 to pin C0664-2 From pin C0664-2, the power flows to the RH front window motor on an SU wire. The motor is energised and drives the window mechanism towards the down position

The front right window motor is earthed via an SK wire to connector C0664-6 on the BCU The BCU completes the earth via pin C0664-5 on a B wire to earth header C0018 LHD/C0017 RHD.

Ignition key modes
Depending on the vehicle specification:

The BCU controls operation of the front windows and will allow operation for a period of 44 seconds after the ignition switch is moved to the off position.

On some models if the time is less than 44 seconds and the drivers door (or any door on some models) is opened the BCU will disable the function of the windows.

On some models the BCU disables the windows as soon as the ignition is turned off.

On all models the windows will not operate while the ignition key is turned to the cranking position III.