Specifications

Testing Testing ABS and Traction Control Systems

ASC/DSC Lamp and Brake Lamp

Vehicles with ASC or DSC usually have a separate console or dash switch to activate the system.

1— ASC/DSC lamp

2— Brake lamp—can be red or yellow depending on the problem.

Figure 4-3 ASC/DSC and brake lamps

ASC/DSC Lamp

For Teves DSC III MK 60 on the E46 (2-wheel drive), the DSC control switch button has two

different functions, depending on the time the button is held down:

• When you press the button for less than 2½ seconds, only the yaw control of the DSC is

disabled. ADB and DBC or maximum braking force for panic stop are still engaged. A higher

slip ratio is allowed up to 42 MPH (67 KPH) for the purpose of improving traction in slippery

conditions. In addition, the traction control does not engage as quickly. Only the DSC Lamp

will be ON.

• When you press the button for more than 2½ seconds, all ASC, DSC, ADB, GMR (yaw

control) and DSC control functions are deactivated. This is used for service and dynamometer

testing. Both the DSC lamp and the yellow brake lamp will be illuminated.

Brake Lamp

For Teves DSC III MK 60 and Bosch DSC III 5.7, the yellow brake lamp illuminates under the

following conditions:

• When there is an ASC/DSC fault (the ASC/DSC lamp will also be on)

• When the complete system is manually shut down (on E46 2-wheel drive)

The red brake lamp illuminates under the following conditions:

• Low brake fluid

• Low brake pad (low brake pad warning lamp should also be illuminated)

• Hand brake on

NOTE:

i Note the following regarding ASC/DSC lamps and brake lamps:

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