Memory Steering Column Power Distribution

Memory Steering Column Power Distribution

Feed from the positive battery terminal (C0192) is supplied to the seat relay and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to the seat relay (C0585) on a G wire. The seat relay is located in the passenger compartment fuse box and is earthed (C0585) on an N wire.

Steering Column Switch

Movement of the steering column is controlled via the 4 way switch mounted on the LH side of the steering column. The seat memory ECU (C0773) is connected to the switch (C1393) as follows:

If forward movement is selected, an earth path is created via the switch on an NU wire If backward movement is selected, an earth path is created via the switch on an NR wire If upwards movement is selected, an earth path is created via the switch on an NB wire If downwards movement is selected, an earth path is created via the switch on an NW wire.

The switch is earthed on an NB wire.

Seat Memory ECU

The seat memory ECU (C0773) interprets the signals received from the steering column switch (C0773) and adjusts the steering column as follows:

If vertical adjustment is requested, the seat memory ECU provides a feed to the height motor (C1395) on a B wire If height adjustment is requested, the seat memory ECU provides a feed to the telescope motor (C1394) on a BU wire.

Both motors are earthed on N wires.