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| Vectra (X25XE) Wiring information for Mk2 Astra (injection models)The following table is my compilation of the wiring necessary to fit the Vectra X25XE V6 engine into a Mk2 Vauxhall Astra (or Kadett-E in Europe). I’ve used this information twice for my own conversions and have proven it to be correct, however as with all information you find for free on the internet, I can’t take responsibility for any mistakes made in wiring, or indeed in my information presented here. Sorry for the small text – I could have deleted the pin numbers, or wire sizes to make it smaller, but some colours are reused and it’s better to be safe than sorry!
Connections marked in Blue are the ones that are typically needed, the ones in grey are simply cut back and ignored for a car with a manual gearbox, no air conditioning, traction control or (Vectra) ABS / alarm. For completeness I have included the 16-pin diagnostic switch wiring, although in general it’s more practical to connect the blink code request and diagnostic ‘K’ line to the standard 10-pin diagnostic connector near the passenger side suspension turret. This guide assumes that you want to retain the standard Vectra immobiliser – in fact there’s no reason not to. The simplest way is to obtain an ignition barrel lock from any later (94 on) Vauxhall Astra / Corsa or Cavalier etc and then insert the Vectra transponder chip into the key. The Vectra immobiliser transceiver (the ring that fits around the ignition lock) can be fitted inside the standard Astra cowl, but it’s a tight squeeze. Well worth it just for the extra security. |
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| Please see the footnotes at the bottom of the page regarding copying this information, it’s provided free here for all to use. If you want to take a print out, please feel free – I’d suggest landscape format to fit it all in. 😉 |
| Connector | Pin | Colour | Size | Purpose | ECU pin | Astra Mk2 | Connects to (On new chassis) |
| X5 (Green) | 1 | ||||||
| X5 (Green) | 2 | Blue/White | 0.50 | Alternator light | None | Engine loom – blue/white | Instruments (Warning lamp) |
| X5 (Green) | 3 | Blue/Green | 0.50 | Oil Pressure Switch | None | Engine loom – blue/green | Instruments (Warning lamp) |
| X5 (Green) | 4 | Black/Yellow | 0.75 | Reversing switch Live / AT Switch Live | None | Engine loom – black (pin 8 ) | Ignition Live |
| X5 (Green) | 5 | White/Yellow | 0.75 | AT Gear Selector | None | ||
| X5 (Green) | 6 | Black/White | 0.75 | Reversing Light Switch | None | Engine loom – black/white | Reverse Lights |
| X5 (Green) | 7 | ||||||
| X5 (Green) | 8 | Black/Red | 2.50 | Starter motor solenoid input | None | Engine loom – black/red | Ignition Switch |
| X5 (Green) | 9 | ||||||
| X5 (Green) | 10 | White | 0.75 | AT Gear Selector | None | ||
| X5 (Green) | 11 | Brown/Green | 0.50 | Oil level Switch | None | Engine loom – brown/green | MID / Check control |
| X5 (Green) | 12 | Green | 0.75 | AT Gear Selector | None | ||
| X5 (Green) | 13 | Grey | 0.75 | AT Gear Selector | None | ||
| X7 (Black) | 1 | Red/Blue | 1.50 | Fuel pump supply | None | Engine loom – thick red/blue | Fuel pump relay |
| X7 (Black) | 2 | Black | 2.50 | Ignition Live feed | 56 | Engine loom – thick black | Ignition Switch (15) |
| X7 (Black) | 3 | Brown/White | 0.50 | Engine ECU K Line | 88 | Diag connector – brown/white | X13 Diagnostic connector |
| X7 (Black) | 4 | Brown/Yellow | 0.50 | Engine ECU blink request | 87 | Diag connector – brown/yellow | X13 Diagnostic connector |
| X7 (Black) | 5 | Brown/Blue | 0.50 | Ground – engine warning light | 8 | Engine loom – brown/blue | Instruments |
| X7 (Black) | 6 | Grey | 0.75 | Torque control | 48 | ||
| X7 (Black) | 7 | Not Used | |||||
| X7 (Black) | 8 | Red/Black | 2.50 | SAI – Valve solenoid | None | ||
| X7 (Black) | 9 | Not Used | |||||
| X7 (Black) | 10 | Blue/Red (3) | 0.50 | Signal lead – Odometer frequency sensor / IMO input | 79 | Engine loom – blue/red | Immobiliser IMO signal |
| X7 (Black) | 11 | Blue | 0.75 | Coolant temperature sensor (instruments) | None | Lighting loom – blue (spade) | Instruments |
| X7 (Black) | 12 | Black/Brown | 0.75 | Fuel consumption signal | 47 | Dash loom – black/brown (2) | MID |
| X7 (Black) | 13 | Green | 0.75 | RPM signal | 80 | Engine loom – green | Instruments |
| X7 (Black) | 14 | Not Used | |||||
| X7 (Black) | 15 | Black/Blue | 0.75 | Signal lead – AC High / Low pressure switch | 43 | ||
| X7 (Black) | 16 | Brown/Violet | 0.75 | AC Compressor Relay (Ground) | 36 | ||
| X7 (Black) | 17 | Black | 1.00 | Ignition Live – Coolant pump | None | Coolant pump positive (only if you fit one) | |
| X7 (Black) | 18 | Not Used | |||||
| X7 (Black) | 19 | Not Used | |||||
| X7 (Black) | 20 | Black | Auto Box ECU – Ignition Live | None | |||
| X7 (Black) | 21 | Black/White | 0.75 | Signal lead – AC Compressor switch | 12 | ||
| X7 (Black) | 22 | Brown/Grey | 0.75 | Ground – SAI pump relay | 37 | SAI relay coil | |
| X7 (Black) | 23 | Red/Black | 0.75 | Signal lead – SAI pump relay | 54 | SAI relay coil | |
| X7 (Black) | 24 | Red/Black | 0.75 | Load signal to AT control unit | 82 | ||
| X13 (Diag) | 1 | Not Used | |||||
| X13 (Diag) | 2 | Not Used | |||||
| X13 (Diag) | 3 | Brown/White | Immobiliser ECU, Alarm and AT | Immobiliser ECU – brown/white | Immobiliser ECU | ||
| X13 (Diag) | 4 | Brown | 0.75 | Ground | Ground | Chassis, or a solid brown (earth) wire | |
| X13 (Diag) | 5 | Brown | 0.75 | Ground | Ground | Chassis, or a solid brown (earth) wire | |
| X13 (Diag) | 6 | Brown/Yellow | 0.50 | Engine ECU blink request | 87 | Diag connector – brown/yellow | Engine IO connector X7, pin 4 |
| X13 (Diag) | 7 | Brown/White | 0.50 | Engine ECU, Instruments and Radio | 88 | Diag connector – brown/white | Engine IO connector X7, pin 3 |
| X13 (Diag) | 8 | Brown/White | 0.50 | Cruise Control, TID/MID | |||
| X13 (Diag) | 9 | Not Used | |||||
| X13 (Diag) | 10 | Not Used | |||||
| X13 (Diag) | 11 | Not Used | |||||
| X13 (Diag) | 12 | Brown/White | 0.50 | ABS/TC and Airbag | |||
| X13 (Diag) | 13 | Not Used | |||||
| X13 (Diag) | 14 | Not Used | |||||
| X13 (Diag) | 15 | Not Used | |||||
| X13 (Diag) | 16 | Red | 0.75 | Permanent Live | 5A fused 12V | Permanent live (for Tech2) | |
| K117 (Immob ECU) | 1 | Brown/Violet | 0.50 | Alarm input | |||
| K117 (Immob ECU) | 2 | Brown/Blue | 0.50 | Engine Management Light | EM light – brown/blue | Instruments, or X7, pin 5 | |
| K117 (Immob ECU) | 3 | Not used | |||||
| K117 (Immob ECU) | 4 | Brown | 0.50 | Ground | Ground | Chassis, or a solid brown (earth) wire | |
| K117 (Immob ECU) | 5 | Black | 0.50 | Ignition Live | Fuse box – black | Ignition switched live | |
| K117 (Immob ECU) | 6 | Blue/Red | 0.50 | Speed input from ABS ECU | ABS ECU | ||
| K117 (Immob ECU) | 7 | Blue/Black | 0.50 | Speed input (via resistor?) / engine ECU IMO signal | 79 | Engine loom – blue/black | Engine ECU Vehicle speed input |
| K117 (Immob ECU) | 8 | Brown/White | 0.50 | Diagnostic line | Diag connector – brown/white | Astra Diag connector, or 16 pin connector | |
| K117 (Immob ECU) | 9 | Red | 0.50 | Permanent live | Fuse box Red | Permanent live | |
| Notes: | |||||||
| (1) Vectra engine was from a manual car, so is already coded to MT, otherwise connect Engine ECU pin 69 (0.5mm Black/Red) to Ground. | |||||||
| (2) Dash loom connector used to plug into XE ECU loom behind fuse box – 4 pins. This is where to pick up the engine management light etc. | |||||||
| (3) Haynes says Blue/red, which is conventional, vectra loom has blue/black | |||||||
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