Page 308 of 363

Check the continuity and insulation with earth and 12 volts of the wiring between :
18 track decoder unit connector (A2 4) antenna ring
Repair the wiring if necessary.
v0406.0
IMMOBILISER
Fault finding- Interpretation of XR25 Bargraphs 82
AFTER REPAIR
Bargraph 7 right hand side illuminated or flashing
ANTENNA RING/DECODER UNIT CONNECTION
XR25 aid: *27 = cc.1 short circuit+ 12 volts
co.0 open circuit
7
None.NOTES
Fiche n° 56
Ignition off, check for + 12 volts on track A2 of the decoder unit connector, wiring side (decoder
connector disconnected and antenna ring connector connected).
If 12 volts + before ignition feed are not measured, replace the +before ignition feed fuse
If the problem persists, replace the antenna ring.
Check that the antenna ring is properly fed with earth on track 2 and 12 Volts on track 3.
Disconnect the 4 track antenna ring connector.
Set the XR25 to pulse sensor mode (button "G", input on terminal "Vin").
When switching the ignition on again, check for a pulse on track A2 of the 18 track decoder unit
connector (test with decoder unit and antenna ring connectors connected).
When the ignition is switched on, is there a pulse?
Replace the antenna ring.YES
NOReplace the decoder unit.
Erase the memorised fault by entering GO** on the XR25 keyboard.
Carry out a conformity check.
Check operation of the immobiliser system.
82-11
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 311 of 363
v0406.0
IMMOBILISER
Fault finding - Customer complaints (petrol version) 82
Only consult these customer complaints after a complete check using the XR25 NOTES
NO XR25/DECODER UNIT COMMUNICATION
IGNITION ON, THE IMMOBILISER WARNING LIGHT FLASHES PERMANENTLY
(impossible to start)
THE IMMOBILISER WARNING LIGHT REMAINS PERMANENTLY ILLUMINATED
(even with the ignition off) OR IS PERMANENTLY EXTINGUISHED
IGNITION ON, THE INJECTION WARNING LIGHT FLASHES PERMANENTLY
(impossible to start)
WHILE DRIVING (deceleration) AND AT IDLE SPEED, THE INJECTION
WARNING LIGHT FLASHES PERMANENTLY
THE VEHICLE WILL NOT START
Fault
Chart
1
Fault
Chart
2
Fault
Chart
3
Fault
Chart
4
Fault
Chart
5
Fault
Chart
6
82-14
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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 313 of 363

v0406.0
IMMOBILISER
Fault finding - Fault Chart (petrol version) 82
AFTER REPAIRCarry out a conformity check.
Check that the immobiliser system is working correctly.
Erase fault memory G0**.
Fault Chart 2IGNITION ON, IMMOBILISER WARNING LIGHT FLASHES
PERMANENTLY (impossible to start)
None. NOTES
no See Fault Chart 1.
Switch on the ignition.
Connect the
XR25. Use fiche n° 56, selector
on S8. Enter D56.
Is there communication between the XR25
and the decoder unit?
yes
no Replace the fuse if necessary.
yes
Check the condition of the antenna ring fuse.
Is the fuse in good condition?
no
Refer to chart for bargraph 4RH in the
section "Fault finding - Interpretation of
XR25 bargraphs ".
yes
no Carry out the programming operation if the
unit is new , if not, replace the decoder unit .
Switch on the ignition and check that
bargraph 4 RH is illuminated.
Is bargraph 4RH illuminated?
yes
A
Switch on the ignition (positive after ignition
feed) and check that
bargraph 19RH is extinguished.
Is bargraph 19RH extinguished ?
82-16
Page 314 of 363
v0406.0
IMMOBILISER
Fault finding - Fault Chart (petrol version) 82
AFTER REPAIRCarry out a conformity check.
Check that the immobiliser system is working correctly.
Erase fault memory G0**.
Fault Chart 2
CONT 1
A
yes
Refer to the chart for BG 7RH in the section
"Fault finding - Interpretation of XR25
bargraphs ".
no
Switch off the ignition and wait until the
immobiliser warning light flashes
(immobiliser active ).
Switch on the ignition and check on fiche
n° 56 whether
BG 7RH is illuminated .
Is
BG 7RH illuminated ?
yesRepair or replace the first key.
no
no Replace the decoder unit .
Check the key recognition function.
Try to start the vehicle with the second key.
Can the vehicle be started?
yes
B
yes
no Refit the antenna ring correctly.Is the antenna ring correctly mounted on the
ignition switch ?
Test the memory of the unit by entering #65
If "0" is displayed , test OK
If "1" is displayed ,fault .
Is "0" displayed on the screen ?
82-17
Page 315 of 363

Check continuity and insulation from earth
and 12 volts of the wiring between :
2 masse
2
+AVC
4A2
Is the wiring in good condition?
v0406.0
IMMOBILISER
Fault finding - Fault Chart (petrol version) 82
AFTER REPAIRCarry out a conformity check.
Check that the immobiliser system is working correctly.
Erase fault memory G0**.
Fault Chart 2
CONT 2
B
no Repair the wiring if faulty.decoder
bornierantenna
ring
yes
yesReplace the antenna ring .
yes
no Replace the decoder unit .
Check for voltage of + 12 volts on track A2 of
the decoder unit (decoder connector
disconnected and antenna ring connector
connected).
Is this voltage present?
yes
Replace the key.
Switch off the ignition and wait until the
immobiliser warning light flashes
(immobiliser active ). Set the XR25 to pulse
sensor mode (button "G",
input on terminal "Vin").
When switching on the ignition again, check
for a pulse on track A2 of the decoder unit
(test with decoder unit and antenna ring
connectors connected).
Is there a pulse?
82-18
Page 316 of 363

v0406.0
IMMOBILISER
Fault finding - Fault Chart (petrol version) 82
AFTER REPAIRCarry out a conformity check.
Check that the immobiliser system is working correctly.
Erase fault memory G0**.
Fault Chart 3IMMOBILISER WARNING LIGHT REMAINS PERMANENTLY ILLUMINATED
(even with ignition off) OR REMAINS PERMANENTLY EXTINGUISHED
Check that decoder unit programming has been correctly carried out.NOTES
no Replace the fuse.
yes
Check the condition of the +before ignition
fuse.
Is the fuse in good condition?
no Carry out petrol configuration G22*1*.
yes
no
Refer to the chart for bargraph 5LH in the
section "Fault finding - Interpretation of
XR25 bargraphs ".
Check that bargraph 3RH is extinguished .
Is bargraph 3RH extinguished ?
yes
no Repair the wiring.
Check continuity and insulation from earth
of the wiring between track A5 of the 18
track decoder unit connector and the
instrument panel .
Is the wiring in good condition?
Check that bargraph 5LH is extinguished .
Is Bargraph 5LH extinguished ?
yes
A
82-19