Page 12 of 37
TYRE PRESSURE MONITOR
Fault finding - System operation
35B
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50
SWAPPING WHEELS
Whenever wheels are swapped over, reprogram the new valve positions in the UCH using the diagnostic tool.
The coloured rings will then have to be placed back in the location marked on the label glued to the driver's door.
WINTER AND SUMMER TYRES
Upon leaving the factory, the summer set is configured in the UCH, but the customer can equip his vehicle with a set
of winter wheels (winter wheels = wheel rims + valves + specific tyres).
When the set of winter wheels is first installed, program the four valve codes.
When switching from one set of wheels to another, recognition is then automatic with no need for UCH operations.
Two or four winter wheels can be installed on the vehicle. But the codes for the four valves present on the vehicle
must be programmed in the winter set.Ring colours: Front left-hand wheel: green Front right-hand wheel: yellow
Rear left-hand wheel: red Rear right-hand wheel: black
Edition 435B- 11
Page 15 of 37
TYRE PRESSURE MONITOR
Fault finding - Configurations and programming
35B
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50TYRE PRESSURE MONITOR
Fault finding - Configurations and programming
SC002:
PROGRAMMING THE FOUR VALVE CODES
IMPORTANT
Any repairs that involve replacement of a wheel sensor require knowledge of the recommendations
defined in Workshop Repair Manual 371 section 35.
–Inflate the four tyres to 3.8 bar.
–Using the diagnostic tool, establish dialogue with the UCH.
–Select the Repair mode menu
–Select the Programming menu
–Select line SC002 Programming the four valve codes under the Tyres function.
Display of stored codes and recognised valve set.
–Select the Valve set selection menu, then Summer or Winter.
–Confirm to obtain the table "valve programming conditions".
–Confirm by selecting next, which brings up the search for valve code menu.
–Excite each valve by holding the valve exciter on the tyre, just under the valve in question.
–Start with the front left-hand wheel.
–Wait for the new code to appear on the screen before moving on to the next valve.
–Program the codes in the following order:
Front left-hand Front right-hand Rear right-hand Rear left-hand
–Click on the "Confirm" button to transmit the codes to the UCH.
–Inflate the tyres to the recommended pressures.
–Carry out a road test: speed > 12 mph (20 km/h) for 10 minutes.
–Make sure no message appears on the instrument panel.
IMPORTANT
When swapping wheels over, reprogram the UCH for the new valve positions using the diagnostic tool and
programming the valve codes.
Then replace the colour rings in the locations noted on the label on the driver's door.
Edition 435B-14
Page 18 of 37
TYRE PRESSURE MONITOR
Fault finding - Configurations and programming
35B
UCH
Program no.: 350 and higher
Vdiag No: 48-4C-4D-4F-50
INSTRUMENT PANEL CONFIGURATION
CF016:
PAX SYSTEM TYRES
(in programming command SC008 UCH type)
IMPORTANT
This command is only available if CF023 Tyre pressure monitor has been configured "With" beforehand.
WRITING THE CONFIGURATION WITH
OR WITHOUT PAX SYSTEM TYRES:
–Select the Repair mode menu
–Select the Programming menu
–Select line SC008 UCH type, then the line CF016 PAX System tyres then with, without.
–Confirm the selection.
–Check that the configuration has been stored correctly.
If the vehicle is equipped with PAX System tyres and the customer would like to install non-PAX System winter
tyres:
–Deconfigure the PAX System option of the UCH using the command described
above
–Deconfigure the PAX System option of the instrument panel using command
CF145 Tyre pressure monitor described below.
Remember to reconfigure the UCH and the instrument panel when switching from winter tyres to summer
tyres.
CF145:
TYRE PRESSURE MONITOR
–After the multiplex network test, select Instrument panel.
–Select the Repair mode menu
–Select the Configure menu
–Select line CF045 Tyre pressure monitor then With, Without or With PAX.
–Confirm the selection.
–Make sure the configuration has been properly stored by checking the Read configuration menu at line LC056:
Tyre pressure monitor.
Edition 435B-17