PROJEKT36 · WIRING

Computer, clock & check control

The dashboard electronics above the radio: the on-board computer, the multi-function clock and on-board display, the check control module that watches the bulbs and fluid levels, and the gong. Hover or tap a row to see where the wire goes.

Standard petrol E36 sedan from the 1998 BMW wiring manual; two-door and Touring rear lamp pins differ. On a phone, scroll the diagram sideways.

projekt36.com/wiring/clock-computer-check-control/

SW blackRT redGN greenBL blueGE yellowBR brownWS white GN/SW = green with black stripe supply / ground of a part shown elsewhere

On-board computer X1070

fuse F23 5A fuse F45 7.5A 0.35 SW/GN starter 30h, splice X276 0.35 GR/RT light switch dimmer 0.35 BL/BR/GE cluster X17 pin 26 0.35 BR/GR sensor B21 X770 pin 1 0.35 SW/WS cluster X17 pin 2 0.35 BL/VI/WS cluster X17 pin 24 0.35 BR/GR brake light switch X78 pin 3 0.35 BL/RT brake light switch X78 pin 2 0.5 WS/BL check control X1074 pin 5 0.5 WS/GN check control X1074 pin 7 0.5 WS/GR check control X1074 pin 3 0.35 WS/RT gong H10 X518 pin 2 0.35 WS/BL gong H10 X518 pin 3 X1070 On-board computer BC V, 18-pin 9 Ignition (15) 14 Radio position (R) 8 Cranking signal (30h) 16 Display lighting (58g) 6 Check lamp in the cluster 12 Outside temperature sensor 13 Road speed 15 Dimmer signal 1 Brake light test 2 Brake lights on 3 Check control data 4 Check control data 5 Check control data 11 Gong 10 Gong

How it works

X1070 is the main connector of the on-board computer: supplies, lighting, the cluster links (check lamp, road speed, dimmer), the brake light inputs, the data lines to the check control module and the gong.

The multi-function clock and the on-board display use the same X1070 layout, so these pins carry the same signals on those units.

Redrawn from BMW ETM 6581.2 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.

On-board computer X1071

0.35 RT/GE fuse F31 5A ground X10012 0.35 WS/SW cluster X16 pin 21 0.35 WS/GR cluster X17 pin 10 0.35 SW/GN EWS X1659 pin 15 0.35 BR/RT indicator stalk S7 via X32 pin 10 0.35 WS/GE diagnostic link 0.35 WS/VI diagnostic link 0.5 SW/WS/GE relay K450 pin 4 X1071 On-board computer BC V, second plug 8 Battery (30) 13 Ground 6 Fuel consumption (TI) 9 Fuel level 1 Code (immobiliser) 4 Program mode 7 Diagnosis RxD 5 Diagnosis TxD 14 Independent ventilation

How it works

The second plug carries the permanent feed, the fuel inputs for consumption and range, the code and timer functions, and the diagnosis lines.

Check on your car

  • The schematic does not mark every pin with its plug. Pins 1, 4, 5, 7 and 13 are put on X1071 because the clock and display pages use those numbers on X1070 for other signals; confirm at the plug.

Redrawn from BMW ETM 6581.2 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.

Multi-function clock / on-board display X1070

fuse F31 5A fuse F23 5A fuse F45 7.5A ground X10012 0.35 SW/GN starter 30h, splice X276 0.35 GR/RT light switch dimmer 0.35 BL/BR/GE cluster X17 pin 26 0.35 BR/GR sensor B21 X770 pin 1 0.35 SW/WS cluster X17 pin 2 0.35 BL/VI/WS cluster X17 pin 24 0.35 BR/GR brake light switch X78 pin 3 0.35 BL/RT splice X181 0.5 WS/BL X1074 pin 5 0.5 WS/GN X1074 pin 7 0.5 WS/GR X1074 pin 3 0.35 WS/RT gong X518 pin 2 0.35 WS/BL gong X518 pin 3 X1070 Multi-function clock clock N10 / display A35 18 Battery (30) 9 Ignition (15) 14 Radio position (R) 17 Ground 8 Cranking signal (30h) 16 Display lighting (58g) 6 Check lamp in the cluster 12 Outside temperature 13 Road speed 15 Dimmer signal 1 Brake light test 2 Brake lights on 3 Check control data 4 Check control data 5 Check control data 11 Gong 10 Gong

How it works

The multi-function clock (N10) and the on-board display (A35) share this plug. Without check control only the supplies, lighting, check lamp and outside temperature pins are wired.

Redrawn from BMW ETM 6213.2 and 6214.0 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out. Not covered: pins 1–5, 10, 11, 13 and 15 are used only with check control.

Analogue clock

fuse F31 5A 0.5 GR/RT light switch ground X10012 X1155 Analogue clock analogue clock N5 1 Battery (30) 3 Clock lighting 2 Ground

How it works

The analogue clock needs only a permanent feed, a ground and the lighting wire.

Redrawn from BMW ETM 6213.1 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.

Check control X1074

fuse F45 7.5A fuse F12 7.5A fuse F11 7.5A 1 GE/GN left headlight E13 1 GE/BL right headlight E14 0.75 GR/VI light switch X503 pin 6 0.75 GR/GE light switch X503 pin 2 1 BL/RT brake light switch X78 pin 2 0.75 GR/SW light switch X503 pin 1 0.5 BR/VI level switch S64 X109 pin 2 0.5 BR/WS level switch S63 X112 pin 2 0.5 WS/GN X1070 pin 4 0.5 WS/BL X1070 pin 3 0.5 WS/GR X1070 pin 5 X1074 Check control module check control A4, inputs 6 Radio position (R) 15 Left low beam feed 8 Right low beam feed 12 Left low beam out 13 Right low beam out 10 Left tail feed (58L) 11 Right tail feed (58R) 9 Brake light feed (54E) 14 Licence plate feed 1 Washer fluid level 2 Coolant level 7 Data to computer / clock 5 Data to computer / clock 3 Data to computer / clock

How it works

The check control module sits in the lamp feeds: every monitored bulb current passes through a measuring resistor inside it. A blown bulb or a low fluid level is sent to the clock, display or computer on three data lines.

Redrawn from BMW ETM 6581.2 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.

Check control X1075

ground X13009 0.75 GR/VI/GE H37 in E46 0.75 GR/GN/GE H25 in E46 0.75 GR/WS/GE H39 in E47 0.75 GR/BL/GE H30 in E47 0.75 BL/BR H24 in E46 0.75 BL/RT H31 in E47 0.75 BL/RT H34 X413 pin 2 0.75 GR/SW E43 X709 pin 2 0.75 GR/SW/GE E44 X710 pin 2 1 BL/RT trailer socket X630 pin 6 1 GR/VI trailer socket X630 pin 7 1 GR/GE trailer socket X630 pin 5 X1075 Check control module check control A4, lamp outputs 9 Ground 6 Left tail light (outer) 12 Left tail light (lid) 4 Right tail light (outer) 10 Right tail light (lid) 15 Left brake light 8 Right brake light 14 Third brake light 2 Left licence plate light 1 Right licence plate light 7 Trailer brake (54) 5 Trailer tail left (58L) 3 Trailer tail right (58R)

How it works

With check control, the rear lamps are fed from the module instead of straight from the light switch and brake switch. Each lamp has its own output, so the module knows which bulb is out.

Redrawn from BMW ETM 6581.2 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out. Not covered: Touring and two-door rear light pin numbers (in the steps where they differ).

Gong H10

0.5 RT/GE fuse F31 5A ground X173 0.35 SW/RT cluster X17 pin 9 0.35 WS/RT X1070 pin 11 0.35 WS/BL X1070 pin 10 0.35 BL/GR PDC X300 pin 21 0.5 BL/GE selector switch X511 pin 3 H10 Gong gong I X522·3 Battery (30) X522·1 Ground X522·2 Cluster warning tone X518·2 Computer tone X518·3 Computer tone X363·1 Park distance control tone X1426·1 Reverse (automatic)

How it works

One gong serves the cluster warnings, the computer or clock, the park distance control and (automatic) reverse.

Redrawn from BMW ETM 6213.2 and 6581.2 (05/99), standard petrol E36 (316i–328i); diesel and M3 parts are left out.

Reading the wire codes

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.