Page 301 of 363

v0406.0
IMMOBILISER
Fault finding- Interpretation of XR25 Bargraphs 82
When communication is established, deal with any fault bargraphs which may
be illuminated.
Carry out a conformity check.AFTER REPAIR
Bargraph 1 right hand side extinguished
XR25 KIT / DECODER UNIT COMMUNICATION
1
Check that lines K and L are not being disrupted by another computer.NOTES
Fiche n° 56
Check the condition of +before ignition feed fuse.
Change the fuse if necessary.
Ensure that the XR25 kit is not the cause of the fault by trying to communicate with another computer on
the vehicle (air conditioning computer, injection computer...).
Check that the ISO interface is in position S8, that the most recent version of the XR25 cassette and the
correct access code are being used(D 56).
Check battery voltage (U > 10.5 volts). Recharge the battery if necessary.
Check that the 18 track decoder unit connector is properly connected.
Check that the decoder unit is properly fed :
-earth on track A8 of the decoder unit connector.
-+ before ignition feed on tracks A9 and A1 of the decoder unit connector.
Ensure that the diagnostic socket is correctly fed.
Check and ensure the continuity and insulation of the wiring of tracks A3 and A4 of the decoder unit
connector.
If there is still no dialogue between the XR25 kit and the decoder unit, change the decoder unit.
82-4
Page 309 of 363

Check the insulation in relation to the earth of the wiring between :
B1 B2
PLIP
decoder unit B2 B3 central locking
B5 A1 button
Are they insulated from earth ?
v0406.0
IMMOBILISER
Fault finding- Interpretation of XR25 Bargraphs 82
AFTER REPAIR
Bargraph 11 left hand side remains extinguished
after pressing the PLIP
PLIP SIGNAL RECEIVED
11
If BG 17right is illuminated, do not apply the following fault finding as the
decoder unit is new. Carry out the Plip programming procedure.
Only consult the following fault finding if BG 11 left remains extinguished after
having tried to lock or unlock the vehicle doors with the PLIP .
NOTES
Fiche n° 56
Check if locking or unlocking the doors is possible by testing with the other key. If locking or unlocking of
the vehicle doors is possible, replace the battery in the first key.
On the infrared transmitter connector, check for + 12 V before ignition feed between tracks B2 and A3.
Is this voltage present ?
Set the XR25 to pulse sensor mode (button "G", input on terminal "Vin").
Check for pulses on track B2 of the infrared transmitter by pressing the PLIP (test
with the decoder unit and infrared transmitter connectors connected).
Are there any pulses when the PLIP is pressed?YES
YES Replace the decoder unit.
NO Replace the infrared transmitter.
NO
YES Repair the faulty wiring.
NO Change the decoder unit.
Carry out a conformity check.
Check operation of the immobiliser system.
82-12
Page 312 of 363

v0406.0
IMMOBILISER
Fault finding - Fault Chart (petrol version) 82
AFTER REPAIRWhen communication has been established, deal with any illuminated fault
bargraphs.
Carry out a conformity check.
Fault Chart 1NO XR25 / COMPUTER COMMUNICATION
Lines K and L are shared between several computers, which can disrupt them. If
the fault persists, it would be prudent to check that they are not disrupting lines K
and L.
NOTES
Ensure that the XR25 is not the cause of the fault by trying to communicate with another computer on the
vehicle (air conditioning computer, injection computer ...).
Check that the ISO selector is on position S8 , that you are using the latest XR25 cassette and and the correct
access code (D56).
Check the battery voltage (U > 10.5 volts). Recharge the battery if necessary.
Ensure that the diagnostic socket is correctly fed.
Check and ensure the continuity and insulation of the wiring of tracks A3 and A4 of the decoder unit
connector.
If there is still no dialogue between the XR25 and the decoder unit , replace the decoder unit .
Check that the 18 track decoder unit connector is correctly connected.
Check that the decoder unit is correctly fed :
-earth on track A8 of the decoder unit connector
-+ before ignition feed on track A9 of the decoder unit connector.
Check the condition of the +before ignition fuse.
Replace the fuse if necessary.
82-15
Page 323 of 363

v0406.0
IMMOBILISER
Fault finding - Fault Chart (diesel version)82
AFTER REPAIRWhen communication has been established, deal with any illuminated fault
bargraphs.
Carry out a conformity check.
Fault Chart 1NO XR25/COMPUTER COMMUNICATION
Lines K and L are shared between several computers, which can disrupt them. If
the fault persists, it would be prudent to check that they are not disrupting lines K
and L.
NOTES
Ensure that the XR25 is not the cause of the fault by trying to communicate with another computer on the
vehicle (air conditioning computer, injection computer ...).
Check that the ISO selector is on position S8 , that you are using the latest XR25 cassette and the correct
access code (D56).
Check the battery voltage (U > 10.5 volts). Recharge the battery if necessary.
Ensure that the diagnostic socket is correctly fed.
Check and ensure the continuity and insulation of the wiring of tracks A3 and A4 of the decoder unit
connector.
If there is still no dialogue between the XR25 and the decoder unit , replace the decoder unit .
Check that the 18 track decoder unit connector is correctly connected.
Check that the decoder unit is correctly fed :
-earth on track A8 of the decoder unit connector
-+ before ignition feed on track A9 of the decoder unit connector.
Check the condition of the +before ignition fuse.
Replace the fuse if necessary.
82-26
Page 346 of 363

1EC761.0
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of XR25 bargraphs
Bargraph 1 right hand side extinguished Fiche n° 49
Code present1
The computers which only control the operation of the seat belt pretensioners do
not have XR25 fault finding (check to be carried out with XRBAG).
When communication is established, deal with any illuminated fault bargraphs.AFTER REPAIR NOTES
Check the presence and condition of the airbag fuse .
Check the condition of the computer connector and the condition of the connections.
Check that the computer is correctly fed :
- Disconnect the airbag computer and fit the 30 track adaptor of the XRBAG.
- Check and ensure the presence + after ignition feed between the terminals marked
Earth and +after ignition feed.
Check that the diagnostic socket is correctly fed :
-+ Before ignition feed on track 16.
-Earth on track 5.
Check the continuity and insulation of the lines of the diagnostic socket / airbag computer connection:
- Between the terminal marked L and track 15 of the diagnostic socket .
- Between the terminal marked K and track 7 of the diagnostic socket .
If dialogue is still not established after these various checks, replace the airbag computer (consult the
section on "Aid" for this operation).
Ensure that the XR25 is not the cause of the fault by trying to communicate with the computer on
another vehicle .
Check that the ISO selector is in position S8, that the latest XR25 cassette and the correct access code are
being used.
Check the battery voltage and carry out the operations necessary to obtain the correct voltage (10.5 volts
< U battery< 16 volts).
88
88-7
Page 348 of 363

1EC761.0
AIRBAG - SEAT BELT PRETENSIONERS
Fault finding - Interpretation of XR25 bargraphs
Bargraph 2 left hand side illuminated Fiche n° 49
Voltage supply
XR25 aid:*02 : 1.dEF : Voltage too low
2.dEF : Voltage too high
3.dEF : Too many micro-breaks
dEF : Cumulative between faults 1.dEF/2.dEF/3.dEF
2
Use the 30 track adaptor of the XRBAG to operate on the computer connector .
Erase the computer memory using the command G0**. AFTER REPAIR NOTES
Carry out the operations necessary to obtain the correct computer power supply :
10.5 volts ± 0.1 < correct voltage< 16 volts ± 0.1.
- Check the battery charge.
- Check the charge circuit.
- Check the tightness and condition of the battery terminals.
- Check the computer earth .
NoneNOTES I.dEF - 2.dEF
For a micro-break fault, check the computer power supply lines :
- Condition of the computer connections.
- Condition of computer earth (track 9 of the 30 track connector towards front right pillar earth).
- Condition / position of the fuse.
- Condition and tightening of battery terminals.
NoneNOTES 3.dEF
The dEF display on the kit indicates the minimum memorisation of 2 of the 3 faults declared by the
display
1.dEF, 2.dEF and 3.dEF (bargraph flashing ).
Operation:
- Check the battery charge.
- Check the charge circuit.
- Check the tightness and condition of the battery terminals.
- Condition of the computer connections.
- Check the computer earth .
- Condition / position of the fuse.
NoneNOTES dEF
88
88-9