Electronic Climate Control

NOTE: Remember that the absence of a diagnostic trouble code (DTC) is, in itself, no guarantee that the system is fault-free.

Self-diagnostics And Fault Indication
The Electronic Climate Control (ECC) climate unit can itself detect certain system faults and display the appropriate DTC by flashing of the light in the A/C button.

The control module is programmed to "make the best" of the situation in the event of a fault. Under these conditions, the control module ignores the faulty signal and selects a preset value. The control module can also prevent the activation of faulty outputs.

If the control module detects one or more faults, the driver is warned by flashing of the A/C button. The DTC(s) may subsequently be "requested" in the workshop by setting the panel controls in a certain manner.





Warning To Driver
The driver is warned of the presence of a fault by continuous flashing of the A/C button when the ignition is switched on. When the engine is started, the driver is also informed if the fault is "serious" or "minor".

- In the case of a serious fault, the lamp will flash continuously while the engine is running.

- In the case of a minor fault, the lamp will flash for approx. 20 seconds after the engine has been started.





Fault Indication To Technician
The following conditions must be fulfilled when a DTC is requested:

- Engine running

- Blower selector in AUTO setting

- Function selector in VENT setting

- Temperature switch set to MAX. cooling

- Rec. switch pressed (IN)

- A/C switch released (OUT)





NOTE:
- All DTCs will be erased when the ignition is switched off.

- A strong light (not a fluorescent tube) must be placed close to the solar sensor, otherwise the DTC for the sensor will be displayed even if the device is fault-free. If this is forgotten, the ignition must be switched off before the next request is made, otherwise the DTC will be displayed in any case.

- To allow the control module time for fault diagnosis and stabilization, a DTC should not be requested within the first 5 seconds after the engine has been started.





Display Of DTCs
Each DTC consists of three digits. For example: DTC 132.
The digit 1 is indicated by a single flash. After an interval, this is followed by digit 3 (three flashes) after a second interval, by digit 2 (two flashes).

The A/C button may now be made to display a flashing DTC by pressing it IN and releasing it OUT within 5 seconds.


Three different DTCs can be stored in the memory simultaneously. Only one DTC can be displayed at a time. (For this reason, it may be appropriate to make several requests to ensure that no DTC is missed.) If several DTCs are stored, they will be displayed repeatedly. For example:

3 DTCs: DTC1, DTC2, DTC3, DTC1, DTC 2...

2 DTCs: DTC1 ,DTC2, DTC1 ,DTC2...

1 DTC: DTC1, DTC 1, DTC 1...

If NO fault is detected, the "fault-free" code (111) will be displayed.