The cruise control module with its stalk, cancel switches and throttle actuator, and the park distance control with its four rear sensors. Hover or tap a row to see where the wire goes.
projekt36.com/wiring/cruise-pdc/
The cruise module reads the stalk, road speed and engine speed, and moves the throttle with the actuator motor. The actuator's magnetic clutch only engages while cruise is active, so the throttle is free otherwise.
The brake light switch and the clutch switch both cancel it; on automatics the selector switch blocks it outside the drive positions.
Redrawn from BMW ETM 6571.0 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.
The PDC switches on in reverse, measures with four ultrasonic sensors in the rear bumper and beeps through the shared gong.
Redrawn from BMW ETM 6621.0 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.
Each sensor has one shielded wire: the core carries the signal, the shield is the second pin.
Redrawn from BMW ETM 6621.0 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.
BMW labels every wire with its size and colour, for example 2.5 SW/GE: 2.5 mm², black (schwarz) with a yellow (gelb) stripe. Connectors are numbered X…, followed by the pin. The wires in these diagrams are drawn at relative thickness, so the 25 mm² battery cable stands out from a 0.35 mm² signal wire.
Codes used here: SW = black, RT = red, GN = green, BL = blue, GE = yellow, BR = brown, WS = white.