PeachParts Mercedes-Benz Forum - View Single Post

dlssmith · #4 11-17-2007, 05:37 PM

Finally broke down and took it to the dealer. The previous diagnosis was to replace the brake booster and I just couldn't do without another opinion. Good thing too. It also had started showing "engine fan" message on the display too. That was also related to the short at the connection described below.

Dealer diagnosis: Checked power at PIN 48 on C1000 control module found it to be 5.8 with ignition off and 1.7 with the vehicle started - should be above 12 volts. Found volt drop on circuit 30 - checked x12/3 power distribution connector underhood and found that terminals were loose and slightly dirty - removed all terminals and cleaned with emery cloth - retorqued bolt and checked and volts were 12.34. .75 hours diagnosis and .3 hours to clean contacts. $122.00 total bill.

No more lights on the display for now. But, damn the corrosion. It's a big factor in a car now 8 years old and with 140k miles.

And, my take is that this isn't just a MB issue, most any car is going to have these issues after a few years. - As complex as the wiring is, it's inevitable.