Pedestrian Protection System - Description

PEDESTRIAN PROTECTION SYSTEM

An Electronic Pedestrian Protection (EPP) system (also known as the PedPro or the Active Hood System) is factory-installed safety equipment, which is available only in vehicles manufactured for certain export markets. The EPP system includes the following major components, which are described in further detail elsewhere in this service information:

- Active Hood Hinge Actuators - The two pyrotechnic EPP active hood hinge actuators are each secured by a screw within a mounting plate located on each of the two active hood hinges, which are located near each rear corner of the hood panel.
- Active Hood Hinges - The active hood hinges have several features and components not found on a conventional hood hinge. In addition to a mounting plate for a pyrotechnic actuator and a reset spring, each active hood hinge includes a mid-strap joined to the hood bracket by a pivot pin at the forward end and a shear rivet at the rearward end. An up-stop pin near the center of the hood bracket fits within a slotted hole near the center of the mid-strap. Refer to Body for hood hinge removal and installation procedures.
- Front Energy Absorber Foam Material - The front energy absorber foam material is sandwiched between the front bumper area of the front fascia and the front bumper support beam. Refer to Frame And Bumpers for front fascia removal and installation procedures.
- Impact Sensors - The EPP system includes three dedicated acceleration-type impact sensors to support the EPP feature. The impact sensors are each mounted by a screw to a receptacle with a U-nut located on the back of the front fascia. One sensor and bracket is located near each end just above the bumper support beam, and one is located near the center just below the bumper support beam. The impact sensors and the sensor mounting provisions are concealed behind the front fascia.
- Occupant Restraint Controller - The Occupant Restraint Controller (ORC) also serves as the Electronic Pedestrian Protection Module (EPPM) in this vehicle. The ORC is located on a mount on the floor panel transmission tunnel near the dash panel just forward of the center instrument panel support.
- Pedestrian Bar - A static, tubular metal pedestrian bar (also known as a leg catcher) is concealed just behind the lower end of the front fascia. The pedestrian bar is suspended at each side from the lower end of a stamped metal bracket that is secured at the top near the same brackets that support each end of the front bumper support beam. Refer to Frame and Bumpers for the pedestrian bar removal and installation procedures.

The ORC and the Instrument Cluster (IC) (also known as the Common Instrument Cluster/CIC) each contain a microcontroller and programming that allow them to communicate with each other using the Controller Area Network (CAN) data bus. This method of communication is used by the ORC for control of the airbag indicator in the IC. Communication - Description.

Hard wired circuitry connects the EPP electronic components to each other through the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system, and to the EPP components through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention as well as pin-out and location views for the various wire harness connectors, splices and grounds.