User Tools

Site Tools


5as_immobiliser

5AS Immobiliser


Where is it?

OK I have to own up to having a left hand drive model where the 5AS is mounted on the inside of the bulkhead near the drivers left knee. UK models I assume are mounted in a mirrored set up near the drivers right knee. Easy to identify by the pink cable going to nowhere which is actually the antenna.


What is it?

The 5AS is a Lucas Immobiliser which can lock out certain ECU functions. It is enabled or disabled by using a “Plip” key. When enabled a LED indicator on the dashboard will flash.


What's it for?

Well its pretty obvious what its for, to stop your car getting nicked! Lucas improved the receiver in 1995 earlier models being somewhat intermittent in the lock/unlock operation. You can identify in which the unit was manufactured as it is printed on one of the white labels in the form Week No./Year in my case 17/99. In most European countries the radio carrier frequency used is 433.92MHz (France 224.5GHz, Italy 315.0MHz). The unit is coded with a four number coding (0-15) the so called EKA and you would need special equipment to find out what it is. If you loose +12v power you will need to re-synchronise the Plip key with the 5AS (see here).

Connector Details

Grey Immobilse connector (5AS Immobiliser)

PIN Colour Function Signal Destination
1
   
Ignition Switch On (+12V) DC Ignition Switch on Position
2
   
Dashboard Ground DC Dashboard Ground
3
4
   
Dashboard Ground DC Dashboard Ground
5-8
9
   
Immobiliser Logic (4 Digit Code) TTL Loom Connector1 Pin 13
10
   
Antenna
11-15
16
   
Diagnostic I/O (1) TTL Diagnostic Connector Pin 3
17
   
Immobiliser LED Drive DC Dashboard LED
18
19
   
Dashboard Ground DC Dashboard Ground
20-23
24
   
Diagnostic I/O (2) TTL Diagnostic Connector Pin 1
25
26
   
Battery direct +12V DC Battery +12V

Black Diagnostic Connector (5AS Immobiliser)

PIN Colour Function Signal Destination
1
   
Diagnostic I/O (2) TTL Immobiliser Pin 24
2
3
   
Diagnostic I/O (1) TTL Immobiliser Pin 16
4
   
Dashboard Ground DC Dashboard Ground
5-6
7
   
Data Link (Diagnostic) DC Loom Connector 2 Pin 1
8-15
16
   
Fused +12V DC Fuse F12

Schema and Signals

5as_immobiliser.txt · Last modified: 2011/12/07 12:55 by admin