The horn relay, the wipe/wash module with the wiper stalk and motor, the headlight washer and the washer jet heaters, pin by pin with the real wire colours. Hover or tap a row to see where the wire goes.
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The horn button switches only the relay coil to ground. The relay then feeds both horns from fuse F8.
No horn: listen for the relay click with the button pressed. A click without horns points to F8, the 87 output or the horn grounds; no click points to the button, the steering wheel contact or the brown/red wire.
Redrawn from BMW ETM 6133.0 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.
The wiper stalk only grounds signal lines; the wipe/wash module reads them and switches the motor, the washer pump and the headlight washer itself.
The stalk codes its positions on three lines: pin 9 alone is single wipe or normal, pins 9 and 12 together are fast, pin 13 is intermittent. The road speed from the cluster stretches the interval when the car is standing.
The park switch in the motor (pin 1) lets the module run the blades back to rest after you switch off.
Redrawn from BMW ETM 6160.1 and 6167.1 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out. Not covered: X295 pin 7 (intensive wash, 0.75 mm² black/green) is not used on this module; Touring rear wiper.
Cars without headlight washers have the simpler Low II module: the same wiper and washer pins, but no F3 feed, no headlight washer output and no lights-on input. It is grounded on two pins.
Redrawn from BMW ETM 6160.1 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out. Not covered: pins 4 and 14 are not used: no headlight washer on this module.
With the ignition on, the thermal switch closes in the cold and powers both washer jet heaters, so the jets do not freeze.
Redrawn from BMW ETM 6169.0 (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.