Preliminaries

1. APPLICABILITY OF THIS DOCUMENT

This document describes the diagnosis applicable to all Passenger Compartment Central Units with the following characteristics:

2. ESSENTIAL ITEMS FOR DIAGNOSIS

Documentation type:

Diagnostic methods (this document):

• Assisted diagnosis (built into the diagnostic tool), paper (Repair Manual or Technical Note), Dialogys.

Wiring diagrams:

• Visu-Schéma (CD-ROM), paper.

Diagnostic tool type:

• CLIP

Essential tool type:

3. REMINDERS

Procedure

To diagnose the vehicle control units, switch the ignition to diagnostic mode (+ after forced ignition).

Proceed as follows:

• Place the vehicle key on the key holder (vehicles without key scenario 1, entry level, without hands-free and scenario 2, high end, with hands-free),
• long press (more than 5 seconds) on the "start" button outside starting conditions,
• connect the diagnostic tool and carry out the required operations.

To cut the + after ignition supply, proceed as follows:

• disconnect the diagnostic tool,
• briefly press the "start" button twice (less than 3 seconds each time),
• check that the + after ignition supply is cut by the ECU warning lights going out on the instrument panel.

Faults

There are present faults and stored declared faults (which appeared under certain conditions and have since disappeared, or which are always present but were not diagnosed under the current conditions).

The present or stored state of faults must be considered when the diagnostic tool is connected after switching on the + after ignition (without operating any components of the system).

For a fault that is present, follow the procedure given in the Fault interpretation section.

For a stored fault, note the displayed faults and apply the Instructions section.

If the fault is confirmed by applying the instruction, the fault is present. Repair the fault.

If the fault is not confirmed, check:

• the electrical circuits corresponding to the fault,
• the connectors of these circuits (corrosion, bent pins, etc.),
• the resistance of the component detected as faulty,
• the condition of the wiring (melted or cut insulation, chafing).

Conformity check

The conformity check aims to verify the states and parameters that show no fault on the diagnostic tool when they are inconsistent. This step therefore allows you to:

• diagnose faults with no fault display that may correspond to a customer complaint,
• verify correct operation of the system and make sure a fault will not reappear after repair.

This chapter therefore contains a diagnosis of states and parameters, under the conditions required for their check.

If a function does not operate normally or a parameter is out of tolerance, refer to the corresponding diagnosis page.

Customer complaints - Fault locating tree

If the diagnostic tool check is correct but the customer complaint is still present, treat the problem using customer symptoms.

4. DIAGNOSTIC PROCEDURE

5. DIAGNOSTIC SHEET

All incidents on a complex system must be subject to a full diagnosis using suitable tools. The DIAGNOSTIC SHEET, to be completed during diagnosis, provides and keeps a record of the diagnosis carried out. It is an essential element of communication with the manufacturer.

This sheet will always be required:

• When requesting technical assistance from the techline.
• For approval requests, when replacing parts that require mandatory approval.
• To be attached to the "monitored" parts returned. It is then required for warranty reimbursement and helps with a better analysis of the removed parts.

6. SAFETY INSTRUCTIONS

Any operation on a component requires safety rules to avoid any material damage or personal injury:

• Check that the battery is correctly charged to avoid damage to the ECUs in case of low charge.
• No smoking.
• Use the appropriate tools.

7. DIAGNOSTIC TOOL CHECK CORRECT

If the diagnostic tool check is correct but the customer complaint is still present, treat the problem using customer symptoms.

8. REPLACING THE PASSENGER COMPARTMENT CENTRAL UNIT

After replacing the Passenger Compartment Central Unit, configure the ECU. Refer to the configuration section of this chapter.