X300 Air Conditioning Self Test and Diagnostics

A VIDEO OF USING TEST MODE

To check for error codes in the Climate Control System with the internal diagnostics via the ‘Panel

Codes’

1. Ignition off - hold down AUTO and RECIRCULATION buttons and

switch on the ignition

2. press AUTO button - if ZERO shows, there's no stored

error codes

3. Press the RECIRCULATED AIR button to start diagnostic, sequence will start to test system.

4. press FACE button repeatedly to scroll through stored

fault codes

5. press FACE and HEATED REAR WINDOW buttons together to

clear a fault code.

6. repeat step 4 if there's more than one code

7. press FAN button to exit Interrogation Procedure

.

Control Panel Fault Code Listing

Reference fault code #23*: In ambient temperatures below 0°C, this code may be logged

because the low ambient causes a temporary low gas pressure. Where the ambient temperature

rises above 40°C, with the engine close to overheating, electrical feed to the compressor clutch

may be cut and code #23 registered.

0 Normal operation no fault codes present None Wait 30 seconds for system self-check.

11 Motorized in-car aspirator malfunction Harness / connector fault Sensor open / short circuit

Panel fault codes are not stored for motorized in-car aspirator motor failure.

12 Ambient temperature sensor malfunction Harness / connector fault Sensor open / short circuit

After rectification, disconnect the vehicle battery for 10 seconds to reset the system.

13 Evaporator temperature sensor malfunction Harness / connector fault Sensor open / short

circuit Refer to PDU

14 Water temperature input malfunction Instrument cluster output Refer to PDU

15 Heater matrix temperature sensor malfunction Harness / connector fault Sensor open / short

circuit Refer to PDU

21 Solar sensor Sensor open /short circuit Refer to PDU

22 Compressor lock signal fault Low refrigerant charge, low compressor oil level, loose drive belt

Harness / connector fault Adjust items as required

23 Refrigerant pressure switch malfunction Harness / connector fault Switch open / short circuit

Refer to PDU23 Refrigerant pressure low refrigerant charge *Leak from damaged pipe or joint

Rectify as required and recharge system

24 Face vent demand potentiometer fault Potentiometer open / short circuit Harness / connector

fault Refer to PDU

31 LH fresh / recirc. potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

32 RH fresh / recirc. potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

33 Cool air by-pass potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

34 Defrost vent potentiometer fault Harness / connector fault In certain circumstances the servo

motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

35 Centre vent potentiometer fault Harness / connector fault In certain circumstances the servo

motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

36 Foot vent potentiometer fault Harness / connector fault In certain circumstances the servo

motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

41 LH fresh / recirc. motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

42 RH fresh / recirc. motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

43 Cool air by-pass motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

43 Cool Air by-pass motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

44 Defrost vent motor fault Harness / connector fault Servo motor seized or sticking Flap seized

or sticking Refer to PDU

45 Centre vent motor fault Harness / connector fault Servo motor seized or sticking Flap seized or

sticking Refer to PDU

46 Foot vent motor fault Harness / connector fault Servo motor seized or sticking Flap seized or

sticking Refer to PDU

PDU DTC codes: not generally accessible with a generic OBDII code reader but linked

to the above may provide additional ‘Possible Causes’