IMPORTANT: if an uncoded injection computer or
solenoid valve is being tested from stock (test
part), the decoder unit
MUST NOT be supplied du-
ring the operation.
If the decoder unit is supplied, switching the igni-
tion on causes a coded signal to be sent from the
decoder unit to the injection computer or coded
solenoid valve (and the code is then program-
med).
To avoid memorising a code which could make
the injection computer or coded solenoid valve
electronic unit unusable after the test, the fuse
(+ before ignition feed) for the decoder unit
must be removed (fuse showing the door locking
symbol). This prevents the coded signal being sent
when the ignition is switched on (the computer or
the coded solenoid valve electronic unit remains
uncoded).
For petrol vehicles, the computer used for the test
MUST have the same Part Number as the original
computer on the vehicle (test computer may be
damaged).
Checking (on petrol vehicle only)
If the test computer is to be returned to stock, it is
possible (before it is removed) to check using the
XR25 that the computer has not been coded du-
ring the test (example : incorrect operation).
Connect the XR25 to the diagnostic socket.
Position the ISO selector and enter the injection
code: bargraph
2 RH (immobiliser) should be illu-
minated.
After entering
the message
should be displayed on the XR25.
This shows that the injection computer is not co-
ded and may be returned to stock.
If bargraph
2 RH (immobiliser) is extinguished and
after entering
the message
is displayed on the XR25, this shows that the
computer has been programmed with the immo-
biliser code (incorrect operation). In this case the
computer must be decoded before being returned
to stock.
The procedure for decoding consists of replacing
the decoder unit on the vehicle with another de-
coder unit with a different code (with its key
head) and entering the security code for the vehi-
cle (security code number should be requested
from the local assistance network, example
DELTA
Assistance for France, NVSR for the UK by fax on-
ly) using the number in the head of the key for the
vehicle.
Ignition off, fit in place of the original decoder
unit on the vehicle, a decoder unit coded with a
different number (the procedure will not work
with an uncoded decoder unit or one which has
the same code as the injection computer).
IMMOBILISER
Coded key immobiliser system
SPECIAL NOTES FOR TESTING AN INJECTION
COMPUTER OR A CODED SOLENOID VALVE (test
part)
82
*22
*22
82-11
CONTROLS - SIGNALS
Rotary switch under steering wheel
This makes the electrical connection between the
steering column and the steering wheel.
It consists of a strip of conductor tracks (airbag)
whose length is designed to guarantee 2.5
steering wheel turns (steering lock plus safety
margin) on each side.
REMOVAL - REFITTING
84
- the horn connector, if fitted,
- the steering wheel bolt,
- the steering wheel after setting the wheels
straight,
- the half cowlings (3 bolts).
Disconnect the connector for the rotary switch
and remove it after removing the three mounting
bolts (E).
Before removing the rotary switch its position
must be noted:
- by ensuring that the wheels are straight on re-
moval so that the track may be positioned in
the centre,
- by immobilising the rotary switch rotor using
adhesive tape.
If it is being replaced, the new part is supplied rea-
dy centred by an adhesive label which will tear off
as soon as the steering wheel is turned for the first
time (fit with the wheels straight).
12970R3
Disconnect the battery.
Remove:
- the airbag cushion by the two torx T30 bolts
(tightening torque : 0.5 daN.m) located behind
the steering wheel and disconnect the connec-
tor (D),
IMPORTANT: It is not permitted to operate the
pyrotechnical systems (airbags and pretensioners)
near a source of heat or flame as there is a risk of
triggering.
IMPORTANT : If the steering wheel is removed,
the airbag connector (D)
MUST be disconnected.
The airbag has a connector which short circuits if
it is disconnected to prevent incorrect triggering.
12973R
84-4
