2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1715

3.1.3.2.1.12. Check power supply at control unit A89 (DTR controller unit).

Check power supply at control unit A89 (DTR controller unit).

Figure legend

- A89 (DTR controller unit)

Test prerequisite

- The voltage test at component G1 (Battery) is o.k.

- Fuse 45 in component N10/1 (Driver-side SAM control unit with fuse and relay module) is o.k.

Test sequence

- Switch off ignition.

- Detach coupling at component A89 (DTR controller unit).

- 1.Measure direct voltage with multimeter between sockets 1 and 1.6

- Switch on ignition.

Specified value

- [11.0 ... 14.5] V

Question

- Is the value o.k.?

YES

Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose

contact and corrosion..