Diagnostic Trouble Code (DTC) Memory

Preliminary work:
- Perform Function Test

Preparation for Test:
1 Fuses OK
2 Battery voltage > 11 V.
3 Unlock vehicle using infrared remote control.
4 Ignition ON.
5 Connect Hand-Held Tester (HHT) to 38-pole data link connector (X11/4) according to connection diagram. Connection and Use of Test Equipment - Section 0
6 Electrical wiring diagrams

NOTE: The diagnostic trouble codes (DTC's) can only be read out and erased using the Hand-Held Tester (HHT).
RCL control modules as of part numbers 210 820 21 26 and 210 820 22 26 can be de-synchronized only with the Hand-Held Tester (HHT) (see Function Test)





Special Tools

Note regarding Diagnostic Trouble Codes (DTC's):
Current diagnostic trouble codes are highlighted in black on the display. Additional detailed fault information based on fault type is displayed with nearly all diagnostic codes (DTC's) such as:







Additionally. further diagnostic info. such as fault frequency is displayed with some of the diagnostic trouble codes.

Fault frequency:
Frequency of the displayed diagnostic trouble code;
4 = periodic fault, appeared 4 times.


Notes regarding the Drive Authorization System (DAS):
- Vehicles equipped with infrared remote central locking (RCL) are also equipped with a Drive Authorization System (DAS).
- The disabling of the engine management system is accomplished via a CAN connection from the RCL control module. Upon disabling the engine management system (vehicle has been locked via RCL), the engine control module interrupts the fuel injection system.
- The drive authorization system (DAS) and anti-theft alarm (ATA) can only be activated or de-activated using either the IR transmitter or the mechanical key.
- The RCL control module and engine control module are "married" together via an identification code. This identification code can not be erased, thus this code remains with the vehicle for its service life. Troubleshooting of an RCL control module (N54) or the engine control module by swapping control modules from another vehicle is no longer possible.





DTC B1000 to B1703