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Posted on Apr 07, 2009

DTC/DSC warning light appeared on my 120d

Not sure if the problem is genuine, the car seems to operating as normal but not sure how to test if this is a genuine fault or how to remove the warning lamp. I have a BMW 120d built in 2005, not 2008 as suggested in the category list

  • 3 more comments 
  • Anonymous Apr 08, 2009

    Mine is a 120i but sounds exactly the same, car seems fine.

  • david_morley Apr 11, 2009

    Hi - there are icons lit on the dash in yellow and these are a traingle and wheel/braking icons both with exclamation marks and the ABS icon is showing yellow. I have also been messing with on-board display and identified 2 error codes on the display but not sure what they mean, the codes are CC ID 24 and CC ID 236

    D Morley

  • david_morley Apr 11, 2009

    please note that I've just been out in the vehicle and the ABS light is no longer lit but the other 2 lights are still displayed but the codes are CC ID 24 and CC ID 35 (not CC ID 236)

    D Morley

  • Anonymous May 08, 2009

    I have a 120d and have the same lights illuminated. The DTC button no longer works.
    Manual says basically the traction control no longer works so drive carefully!

    I have researched the problem which seems fairly common, one good suggestion is an ABS sensor ring on the rear wheels.. if that is not connected properly or comes loose can cause this problem.

    I'm going to have a look to see if it's a DIY job this weekend.. Will let you know

  • Anonymous May 11, 2010

    Hi, is the DTC/DSC light still illuminated?

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  • Posted on Aug 09, 2009
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My advice - take the vehicle to your local dealer - tell them you just want it diagniosed - agree a time of say 20 minuits. That way you will know for sure and can then carry out any diy repairs yourself BUT should it require a complete hydraulic unit which is likely as they are hmm what's the word ... ****!- contact BMW customer service for financial contribution. Anon

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Ford Factory service repair info. pin point test .

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  • Use the recorded results from LCM self-test.
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For all other DTCs, REFER to Section 419-10 .

No
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  • Use the recorded results from DDM self-test.
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Yes
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DTC B1566, GO to B4 .

No
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No
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No
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No
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please rate if this helps you.

---------
  • The Courtesy Lamps Stay On Continuously
  • Circuitry.
  • GEM/CTM.
  • Ignition switch.
  • Interior lamp relay.
  • Dimmer module.
  • Door ajar switch.
  • DTC B1322.
  • DTC B1330.
  • DTC B1334.
  • DTC B1338.
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  • DTC B1574.
  • DTC B1610.


------------------------------------
Generic Electronic Module (GEM)/Central Timer Module (CTM) Controlled Functions
The generic electronic module (GEM) is equipped on four-wheel drive vehicles with power windows. The central timer module (CTM) is equipped only on two-wheel drive vehicles without power windows.
NOTE: GEM/CTM diagnostics are compatible with New Generation STAR (NGS) Tester.
The GEM/CTM incorporates the functions of several different modules into one, and offers diagnostics to easily locate and repair concerns affecting the subsystems that it controls.
The GEM/CTM constantly monitors the systems under its control and reports a concern in the form of a diagnostic trouble code (DTC). A DTC can be retrieved with NGS Tester through the communication link.
NGS Tester is a menu-driven tester that allows the user to run specific tests. NGS Tester can isolate faults in the GEM/CTM subsystems through a symptom-driven diagnostic procedure. Connecting NGS Tester to the GEM/CTM communication link will not alert the GEM/CTM. If the GEM/CTM is "asleep" when the diagnostic connector is plugged in, the GEM/CTM must be "awakened". If the communication link cannot be established, it is advised to turn the ignition to RUN.
NOTE: The GEM/CTM has a sleep function to minimize battery consumption. During the sleep mode, the GEM/CTM turns off all outputs and monitors only the following:
  • Door ajar (driver door, passenger door, liftgate, LH rear and RH rear doors).
  • Key-in-ignition.
  • Key in RUN or ACC.
  • Two-step unlock switch (unarm switch).
  • Digital TR sensor.
  • Illuminated entry request (remote anti-theft personality [RAP] module).
If a change of status occurs at one of these inputs while the GEM/CTM is asleep, the GEM/CTM will "wake up." When the GEM/CTM awakens, it performs an internal self-test, and begins normal operation. At this point, the GEM/CTM will have all of its functions operational.
The GEM/CTM will go into the sleep mode immediately after both of the following conditions have been met:
  • Key in OFF or key not in ignition.
  • After 45 minutes with no change in any wake-up input.
The GEM/CTM control system has two modes of operation; the normal operating mode and the tester-dependent diagnostics mode.
The normal operation of the GEM/CTM can detect errors. An integral part of the normal GEM/CTM operation is the continuous diagnostic capability. Continuous diagnostics detects errors and changes the GEM/CTM control strategy. There is no warning lamp for the GEM/CTM; therefore, a DTC concern will direct you to the GEM/CTM. Examples of faults that may be detected during normal operation include:
NOTE: The GEM/CTM can only detect open circuit/short to GRD faults when the GEM/CTM in not energizing a load, and short to battery faults when the GEM/CTM is attempting to energize a load.
  • GEM/CTM continuous self-test (RAM, ROM, EEPROM, A/D checking).
  • Output driver monitoring (open circuit/short to ground [GRD], short to power).
  • Illogical combinations of input signals.
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