62C - 3
MANUAL AIR CONDITIONING
62C
V2 MR-372-J84-62C000$010.mif
262CMANUAL AIR CONDITIONING
Fault finding – Introduction
3. REMINDERS
Procedure
To run fault finding on the vehicle's computers, switch on the ignition in fault finding mode (+ after ignition forced
setting).
Proceed as follows:
–With the vehicle card in the card reader (scenario 1 keyless vehicle, entry level, without hands-free and
scenario 2, top of the range, hands-free),
–Press and hold start button (longer than 5 seconds) with start-up conditions not fulfilled,
–Connect the diagnostic tool and perform the required operations.
To cut off + after ignition, proceed as follows:
–Disconnect the diagnostic tool,
–Press the start button twice briefly (less then 3 seconds),
–Ensure that the + after ignition feed has been cut off by checking that the computer warning lights on the
instrument panel have gone out.
Faults
Faults are declared either present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but have not had fault finding performed on them within the
current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is used after the
+ after ignition feed has been supplied (without acting on the system components).
For a present fault, apply the method described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the faulty component,
–the condition of the wires (melted or cut insulation, wear).
Conformity check
The conformity check is designed to check the states and parameters which do not display any faults on the
diagnostic tool when inconsistent. This phase therefore allows:
–Diagnoses of faults that do not have a fault display, and which may correspond to a customer complaint.
–Checks to ensure that the system is operating correctly and that there is no risk of a fault reappearing after
repairs.
This section gives the fault finding procedures for states and parameters and the conditions for checking them.
If a state is not behaving normally or a parameter is outside permitted tolerance values, you should refer to the
corresponding fault finding page.Note:
The left-hand and right-hand Xenon bulb computers are powered when the dipped
headlights are lit. Fault finding procedures can only be carried out on them after the
ignition has been switched on in fault finding mode (+ after ignition forced setting) and the
dipped headlights are on.
62C - 6
MANUAL AIR CONDITIONING
62C
V2 MR-372-J84-62C000$020.mif
MANUAL AIR CONDITIONING
Fault finding – System operation and track allocation
System operation
The manual heating and ventilation system does not have a computer. It consists solely of a control panel from which
the compressor (controlled by the Protection and Switching Unit and injection), the passenger compartment heating
resistors (controlled by the UCH with permission from the Protection and Switching Unit and injection) and rear de-
icer (managed by the Protection and Switching Unit) are started as explained in the synopsis of heating and
ventilation system operation in Section 62A.
The panel, by means of cables, also controls the air distribution flaps, air distribution and recycling, as well as fan
assembly speed through a connecting wire and resistor unit.
Manual heating and ventilation system control panel track allocation
Control panel
track Allocation Sensor or actuator track
A1 Earth
A2 Passenger compartment ventilation control
speed 1Resistor unit connector A track 1
A3 Passenger compartment ventilation control
speed 2Resistor unit connector A track 2
A4 Passenger compartment ventilation control
speed 3Resistor unit connector A track 3
A5 Passenger compartment ventilation control
speed 4Resistor unit connector A track 4
A6 Not used
B1 Passenger compartment ventilation speed 0
signal UCH
B2 + 12 V side lights Protection and Switching Unit
B3 Rear screen de-icer operation request UCH
B4 Rear screen de-icing control indicator light UCH
B5 Earth
B6 Air conditioning control indicator light UCH
B7 Air conditioning operation request UCH
B8 +12 V accessories Fuse and Relay box
B9 Not used
62C-9
MANUAL AIR CONDITIONING
Fault finding – Customer complaints62C
V2 MR-372-J84-62C000$030.mif
MANUAL AIR CONDITIONING
Fault finding – Customer complaints
NOTESSpecial notes:
A general summary of all air-conditioning fault finding charts can be found in
Section 62A. The customer complaints listed below solely involve the heating and
ventilation system control panel. For cold air and warm air production faults, refer to
Section 62A.
AIR DISTRIBUTION PROBLEM
AIR DISTRIBUTION PROBLEM ALP 2
AIR FLOW FAULT ALP 3
INEFFICIENT WINDSCREEN DEMISTING ALP 4
NO PASSENGER COMPARTMENT VENTILATION ALP 5
PASSENGER COMPARTMENT ODOURS
UNPLEASANT ODOURS IN PASSENGER COMPARTMENT ALP 11
WATER IN PASSENGER COMPARTMENT
WATER IS PRESENT IN PASSENGER COMPARTMENT ALP 12
CONTROL PANEL FAULT
NO CONTROL PANEL LIGHTING ALP 13
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
62C-21V2 MR-372-J84-62C000$040.mif
ALP 13 No control panel lighting
NOTESNone.
Check that the fuses are in good condition.
Repair if necessary.
Check that the bulbs are sound.
Repair if necessary.
Check for the presence of an earth on track B5 and track A1 of the control panel.
Repair if necessary.
With the side lights switched on, ensure that there is + 12 V side light supply on track B2 of the control panel.
Repair if necessary.
If the fault persists, contact your Technline
AFTER REPAIRCheck that the system is operating correctly.
