Pedestrian Protection Function - GF91.60-P-1005GR

MODEL 166 up to model year 2016 with CODE U60 (Pedestrian protection)

Function requirements, general

Vehicle speed v = 25 to 55 km/h
Terminal 15 ON

The electronic ignition lock control unit (N73) sends the status of circuit 15 via chassis CAN 1 (CAN E1) to the supplemental restraint system control unit (N2/10).

The instrument cluster (A1) sends the vehicle speed via chassis CAN 2 (CAN E2), electronic ignition lock control unit and chassis CAN 1 to the supplemental restraint system control unit.

Pedestrian protection, general

The pedestrian protection function reduces the level of injury severity in the event of a collision of the vehicle with a pedestrian. The cavity between the engine hood and the components below is increased by raising the engine hood in the area of the A-pillars. This space prevents the pedestrian from being hit directly by the components below the engine hood.

The pedestrian protection function includes the following subfunctions:

Function sequence for impact detection
Function sequence for activating pedestrian protection

Function sequence for impact detection

The Supplemental Restraint System control unit reads in the signals directly from the following sensors:

Left front bumper pedestrian protection sensor (B151/1)
Center front bumper pedestrian protection sensor (B151/2)
Right front bumper pedestrian protection sensor (B151/3)

The supplemental restraint system control unit decides to deploy the pedestrian protection depending on the determined acceleration values.

The pedestrian protection can be actuated erroneously in collisions with other objects (e.g. poles, guide posts or thick branches).

Function sequence for activating pedestrian protection

The engine hood is lifted in the area of the A-pillar using the engine hood lifter. To do so, the Supplemental Restraint System control unit actuates the following squibs directly:

Left rear active engine hood squib (R12/49)
Right rear active engine hood squib (R12/50)

The status of the active engine hood squibs is monitored by the Supplemental Restraint System control unit. In the event of faults, a corresponding message is shown in the multifunction display (A1p13) of the instrument cluster. The request for this is sent by the supplemental restraint system control unit over chassis CAN 1, electronic ignition lock control unit and chassis CAN 2 to the instrument cluster.

Raising the engine hood has no further effects on the triggering behavior of the supplemental restraint system.

MODEL 166

up to model year 2016

with CODE 489 (AIRMATIC (air suspension with level adjustment and adaptive damping system (ADS)))

with CODE U60 (Pedestrian protection)

The triggering threshold for pedestrian protection is raised when driving off-road to avoid inadvertent activation. The AIRMATIC control unit (N51/3) sends the status of the vehicle level via chassis CAN 1 to the supplemental restraint system control unit.

	Function schematic for electric pedestrian protection		PE91.60-P-2054-97NAA
	Overview of system components for supplemental restraint system		GF91.60-P-9996GR