What drives speed message to MCS unit?
Thread Starter
Senior Member
Joined: Oct 2004
Posts: 272
Likes: 3
From: Michigan
SL600 r230, SL600 r129, SL500 r230, ML320, C280 Sport, R170 450SL, 190e 2.3 16V (2)
What drives speed message to MCS unit?
2003 ML350
The other day, the volume kept going up even though I was not going fast enough to drive that. I reached over and turned the volume down, and since then no issue.
Today I hooked up my X431 DGS and low and behold, I had a fault code on the MCS - speed sensor fault.
What drives that fault?
Cruise control works fine, speedo works fine, abs works fine.
Thanks in advance!
The other day, the volume kept going up even though I was not going fast enough to drive that. I reached over and turned the volume down, and since then no issue.
Today I hooked up my X431 DGS and low and behold, I had a fault code on the MCS - speed sensor fault.
What drives that fault?
Cruise control works fine, speedo works fine, abs works fine.
Thanks in advance!
Senior Member
Joined: Jul 2004
Posts: 260
Likes: 2
From: New England
1990 190E 2.6, ... 1998 ML320, 2005 ML500SE
The MCS's speed signal comes from the Transmission Control Module just behind the shifter in the center console. The speed signal is used by the MCS's Navigation Module, if installed.
The MCS volume is controlled by a microphone located in the overhead console near the trip computer and not the speed signal.
The speed signal that controls the speedometer and cruse control comes from a different source.
Individual speed sensors on each wheel controls the ABS and 4ETS.
Mike
The MCS volume is controlled by a microphone located in the overhead console near the trip computer and not the speed signal.
The speed signal that controls the speedometer and cruse control comes from a different source.
Individual speed sensors on each wheel controls the ABS and 4ETS.
Mike
Thread Starter
Senior Member
Joined: Oct 2004
Posts: 272
Likes: 3
From: Michigan
SL600 r230, SL600 r129, SL500 r230, ML320, C280 Sport, R170 450SL, 190e 2.3 16V (2)
DTC B1734 speed sensor is what is shown on MCS via a X431 DGS scanner. Does this give a hint as to what could be bad?
