Cavalier MK3 - Astra GTE digital dash wiring guide



First of all remember an astra digital dash does not have :-



1) 4x4 light

2) check control lights



A cavalier dash has 3 connectors:-




1. large connector, fully populated behind rev counter - does most things

2. large connector, few wires behind petrol gauges - does ABS & 4x4

3. small square one for check control only





An astra Digital dash has 2 connectors:-



large connector like cavalier one which does all lights at the bottom of the dash small pins with lots of pins which does everything else





Cavalier Connector 1 Astra

Pin Functions Colour Pin




1

2 Alternator Light Blue/White 1 small pin

3 Speedo Blue/Red 21 small pin (and gear box sender)

4 Earth Brown 9 small, 10 small, 11 small, 15 large

5 Illumination Grey/Black 3 small

6 Engine Temp Blue 17 small

7 Fuel Gauge Blue/Black 4 small

8 Revcounter Green 7 small

9 Ignition Black 15 small, 9 large, 5 small

10 Brake Fluid Brown/Red 4 large

11 Handbrake Brown/White 3 large

12 Engine Man Brown/Blue 11 large

13 Indicator Black/White/Green not connected

14 IGN (Ind Fuse) Black not connected

15 Oil Light Blue/Green 22 small

16 Main Beam White 14 large

Indicator Right Black/Green 1 large

Indicator Left Black/White 16 large

Oil Pressure Blue/Yellow 12 small

Illumination Grey/Green 13 large, 16 small



Cavalier Connector 2 - Astra

Pin Functions Colour Pin



1 Seat Belts

2 Airbag (Brown/Yellow too !)

5 TC

6 Trailer Ind White/Green 12 large

7 4x4 Brown/Black To a spare light large

8 ABS Brown/Yellow 6 large

10 Auto Gear box Brown/Violet

11 Glow plugs

12 CAT






You will need to run 2 wires from the indicator switch to the dash:-

Indicator Right Black/Green 1 large

Indicator Left Black/White 16 large




For the illumination and dimmer to work correctly you will have to connect the
White/Yellow wire (lights on green light) & Grey/Green from pin 16 (relay)
together and run to the fusebox grey/green wire fuse 9 bottom pin.


You will need to add the speedo sender to the gear box and connect:-

black to ignition

brown to ground

blue/red to 21 small pin and Blue/Red wire of the cavalier loom to drive the 4x4 and fuel computer



Speedo calibration



There is a switch on the LCD dash which changes the speedo calibration depending

on what tyres you have and gearbox etc.



There are 2 options on the dash (for astra)



175/70*13 (185/65*14 Astra GTE 16v models)

185/60*14 Astra GTE 8v models



You will have to set this the best you can by trying position 1 and 2 and comparing

the speed reading you get with the fuel computers instant speed reading found

by putting the fuel computer into average speed mode and then resetting it.

Even if you get the fuel computer and speedo matching it may still not be right,

to check follow a car at a constant speed.





To get the oil pressure gauge working you will need to replace your oil pressure switch

with an oil pressure gauge sender and combined pressure switch.



from a cavalier 1984 GL,CD, Astra Mk1 SR/GTE (about Å“44 new)

or Astra Mk2 GTE, Calibra 1995 (about Å“66 new)



The expensive ones have a water proof connector like the cavalier one.

However the Å“44 is just as good !



If you have an expensive one simply plug in the water proof connector to the cavalier loom blue/green

And run a new wire from the other terminal (push on) (blue/yellow) to 12 small.



If you have a cheep sender cut off the water proof plug on the cavalier loom and add a spade. then connect to sender.

And run a new wire from the other terminal (push on) (blue/yellow) to 12 small.