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Notice
7.10
Bosch Motorsport
The included wiring harness is structured in such a way that the power supply to
the ABS warning light (MIL) is branched off before the main switch for ABS M4
(terminal 30). This is the only way to ensure that the ABS warning light (MIL) is on
when ABS M4 is not working.
Cable length connector to electronic board: 600 mm
Position the ABS warning light (MIL) so the driver can see it
easily.
MIL is on permanent if ABS map switch is in position OFF or
the diagnosis software is active.
7.9
Diagnosis Interface
You can connect the ABS M4 to a laptop with the optional MSA Box II, see sec‐
tion MSA Box II
terface connector should be placed so it is easily accessible. You can use pro‐
gramming and diagnosis software, see section Programming and Diagnosis Soft‐
ware
[}
26], to program settings specific to the vehicle and open/delete error
messages.
Before using the MSA Box II for the first time you have to install a driver on your
laptop, which you can find for free download on our homepage www.bosch‐mo‐
torsport.de.
See also ABS M4 – Laptop communication
Brake Light Switch
The brake light switch informs the ABS M4 when 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 M4
control unit; see the wiring diagram at the end of this manual (Wiring Dia‐
gram ABS M4
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 M4 control unit every
time the brake light switch is active (driver is braking).
[}
17], via the "diagnosis interface" connector. The diagnosis in‐
[}
52]). Terminal 15 on the brake light switch cable remains
ABS M4 Manual
Assembling the Parts | 7
[}
25]
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