Diagnosis Interface; Brake Light Switch - Bosch ABS M4 User Manual

7 | Assembling the Parts
7.10
Notice
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▪ The user is connected to the car via the RaceABS tool and MSA Box
▪ There is an active fault disabling ABS
7.9

Diagnosis Interface

You can connect ABS M4 to a laptop with the MSA Box II via the "diagnosis inter‐
face" connector. The diagnosis interface connector should be placed so it is easi‐
ly accessible. You can use programming and diagnosis software, see section Pro‐
gramming and Diagnosis Software, to program settings specific to the vehicle
and open/delete error messages.
Before using the MSA Box II for the first time first time, a driver must be installed
on the laptop. This is available on our homepage, www.bosch‐motorsport.com

Brake Light Switch

The brake light switch informs the ABS M4when the driver wishes to brake and
therefore functions as a means of plausibility certification for the ABS system. If
the brake light switch signal is not available or incorrect, there may be a delay in
ABS control.
▪ If a brake light switch is already fitted in your vehicle:
During braking, the brake light switch emits 12 Volts to pin 30 of the ABS
M4control unit; see the wiring diagram at the end of this manual (Wiring Dia‐
gram [} 48]). Terminal 15 on the brake light switch cable remains open.
▪ If a brake light switch has not yet been fitted in your vehicle:
Retrofit a brake light switch if your vehicle does not have one already. In this
scenario, terminal 15 supplies the voltage for the brake light switch.
In all cases there must be 12 Volts on pin 30 of the ABS M4control unit every
time the brake light switch is active (driver is braking).
Pin 30 sends the braking signal to the ABS control unit – al-
ways make sure it is connected (12 Volt)!
Terminal 15 remains open if the vehicle already has a brake
light switch.
Terminal 15 supplies the voltage to a retrofit brake light
switch.
ABS M4 Manual Bosch Motorsport