Parking Brake Switch
The parking brake switch has three positions of which two are counter sprung and the third is the neutral position.
The parking brake switch consists of a number of smaller switches. The switch has 6 terminal pins. When the switch is activated the smaller switches open and close inside the switch. This creates a pattern for the 6 terminal pins. The Park Brake Module (PBM) recognizes certain approved patterns for activating and deactivating the parking brake. If a faulty pattern occurs the Park Brake Module (PBM) indicates this by a diagnostic trouble code being set.
Background lighting/instrument lighting for the parking brake switches are supplied with voltage via the central electronic module (CEM).