| STEP | OPERATIONS TO BE CARRIED OUT | TEST RESULTS |
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| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Using the diagnostic equipment (Examiner or other instruments) connected, check the following information at the CAN network:- no control unit not activated;
- that there are no faulty control units;
- no control unit with faulty CAN line
| Move on to Step | 1. Presence of faults | 1. Continue following the instructions for the diagnostic equipment |
| 2. Climate control system control unit error | Move on to Step |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Keeping the diagnostic equipment (Examiner or other instruments) connected to the diagnostic socket, check:- for faults in the climate control system control unit
| Move on to Step | 1. Error detected in the control unit | 1. Continue following the instructions for the diagnostic equipment |
| 2. No communication with the control unit | 2. Restore the connection between the climate control system control unit and the diagnostic connector (Wiring Diagram ) E6020 AIR CONDITIONING |
| 3 | ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Connect the diagnostic equipment (Examiner or other instruments) and carry out the active diagnosis of the mixing motors | Move on to Step | mixing motor(s) not working | Move on to Step |
| 4 | CHECK ELECTRICAL CIRCUIT | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the condition of the electrical circuit for the mixing motors | Move on to Step | 1. Mixing motor(s) electrical circuit faulty | 1. Restore the connections (see Wiring Diagram E6020) |
| 2. Connections correct, right motor defective | 2. Replace the motor See in Op. 5040D86 air conditioner right air mixture flap control motor - r r |
| 3. Connections correct, left motor defective | 3. Replace the motor See in Op. 5040D84 air conditioner left hand air mixer flap control motor - r r |
| 5 | HEATER HYDRAULIC CIRCUIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check:- that there is no air in the heater circuit
- the seal of the supply and return pipes
| Move on to Step | 1. Air in the circuit | 1. Bleed the heater circuit |
| 2. No pipe seal | 2. 1. Renew the seal, if necessary, replace the pipe See in Op. 5040A50 PIPE from compressor to air conditioner condenser - R and R |
| 6 | HEATER RADIATOR CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the efficiency of the heater radiator | Move on to Step | Radiator dirty or obstructed | Clean the radiator, if necessary, replace it See in Op. 5040C50 Air conditioning HEATER RADIATOR - R.R. |
| 7 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the fault is no longer present | | | |