IMMOBILISER
Coded key immobiliser system
REPLACING A KEY HEAD
The coded chip in the key head or the remote
control (depending on equipment) is faulty :
- order a replacement key head using the num-
ber in the faulty key head (eight alphanumeric
characters beginning with the letter E or A). If
the key head is from a remote control type key,
carry out a resynchronisation operation.
IMPORTANT: The resynchronisation procedure
differs depending on if the decoder unit has
been replaced or not (see specific or simple re-
synchronisation procedure in section 88).
- if the customer requires the fault to be repaired
immediately (2nd key unavailable) a complete
kit may be fitted to the vehicle (decoder unit
plus two key heads) (see replacing a complete
kit).
The key has been lost:
- order a replacement key head using the num-
ber in the key head of the 2nd key (eight alpha-
numeric characters beginning with the letter E
or A) or on the label (normally attached to the
keys when the vehicle is delivered).
In this case, remember to order the metal
number insert for the new key head. If the key
head is from a remote control type key, carry
out a resynchronisation operation.
IMPORTANT: The resynchronisation procedure
differs depending on if the decoder unit has
been replaced or not (see specific or simple re-
synchronisation procedure in section 88).
IMPORTANT: Do not touch the key head chip
when taking note of the number in the key head.
Any key which has been touched must be repla-
ced.
NOTE: if the key head number cannot be located
(both keys lost together with the label), the
complete kit must be replaced (decoder unit, plus
2 transponder keys, plus injection computer or co-
ded solenoid valve electronic unit).
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REPLACING THE DECODER UNIT ALONE
A new decoder unit is not coded. Once fitted to
the vehicle, the codes of both keys must be pro-
grammed so that it is operational (see program-
ming procedure).
NOTE : if the decoder unit alone is replaced, no
operation is carried out on the injection computer
or coded solenoid valve. It retains the same en-
gine immobiliser code.
IMPORTANT: when a decoder unit has been pro-
grammed with the key code, the code cannot be
erased and no other code may be memorised in its
place.
SPECIAL NOTES
Diesel vehicles
On these vehicles, the decoder unit is identical to
the decoder unit of a petrol immobiliser system.
When replacing it the new "diesel" part must be
configured by means of the XR25 test kit.
This configuration will enable the decoder unit to
check that the coded solenoid valve is operating
correctly (indicated by the immobiliser warning
light) (see diesel configuration).
Vehicles fitted with a remote control
After replacing the decoder unit carry out a resyn-
chronisation operation (see simple resynchronisa-
tion procedure, section 88).
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