Brake Light Switch Signal

Brake-Light/Brake-Test Switches

Two switches are fitted on the brake pedal which supply the following signals:
- S_BLS (Brake-Light Switch)
- S_BLTS (Brake-Light Test Switch)

The DME control module evaluates the signals for the purpose of registering brake operation.

Function
- Model series E53:
The brake-light switch connects to ground (B-), the brake-light test switch connects to B+.

Both signals are checked for plausibility.

The tables show (depending on the model series) how the status of the brake-light switch/brake-light test switch performs:







Troubleshooting
If the signals are not plausible in relation to one another, a fault code is stored in the DME control module. Cruise control is deactivated as a result of this fault memory entry.