Manual Climate Control MCC/Standard Heater

Reading and erasing diagnostic trouble codes (DTCs)

Stored diagnostic trouble codes (DTCs) can be erased using this function. The on-board diagnostic (OBD) system can identify 10 faults in the form of diagnostic trouble codes (DTCs).

To reading off diagnostic trouble codes (DTCs), proceed as follows:






- ignition ON, position I or II.
- wait approximately 3 seconds
- ignition off
- ignition on again
- wait for 0.5 seconds. If a diagnostic trouble code (DTC) is stored, the indicator LED will flash once. Only start pressing the buttons after the flashing
- press the REC button in twice within the following 2.5 seconds
- read off the flashes from the REC indicator LED.

The REC indicator LED flashes for 1 second and is off for 0.5 seconds. The timing between the numbers in a DTC code sequence is 2 seconds. The time between two codes is 5 seconds. If no diagnostic trouble codes (DTCs) are set the code will be 1-1-1.

For erasing diagnostic trouble codes (DTCs), proceed as follows:

- ignition ON, position I or II.
- wait approximately 3 seconds
- ignition off
- ignition on again
- wait for 0.5 seconds. If a diagnostic trouble code (DTC) is stored, the indicator LED will flash once. Only start pressing the buttons after the flashing
- press the REC button in four times within the following 2.5 seconds

Note! The diagnostic trouble codes (DTCs) can also be erased by disconnecting the control module for more than 2 minutes (supply voltage power disconnected), because after 2 minutes the entire control module memory will be erased!
Diagnostic Trouble Code (DTC) 5 - 1 - 2 can only be erased by disconnecting the control module for more than 2 minutes or by carrying out a successful self-adjustment.

Hint: If the indicator LED still flashes once when the ignition is turned on this means the erasure procedure has not been successfully completed and the diagnostic trouble code (DTC) has again been stored.

The exception is diagnostic trouble code (DTC) MCC 1-1-1 for certain control modules






Note! Fault-tracing for MCC 3-4-2 should be carried out on the MCC/STANDARD control modules introduced at start of production of the S70/V70/C70. If the REC button orange indicator LED flashes once when the ignition is turned on (diagnostic trouble code (DTC) stored) but the control module flashes out diagnostic trouble code (DTC) 1-1-1.

This applies to control modules marked with "S2", "S3" or "S4". See illustration.