New Pedestrian Impact Detection System

A new safety system on the 2018 Buick Regal is the Pedestrian Impact Detection System (PIDS). (Fig. 9) Its primary function is to provide supplemental protection to pedestrians involved in vehicle impacts by raising the hood to create sufficient vertical deformation space. In Europe and Japan, an active pedestrian impact detection system is necessary for vehicles that do not provide the required deformation space under the hood.

 

Fig. 9

 

The Pedestrian Impact Detection System includes the following components

  • Inflatable Restraint Sensing and Diagnostic Module
  • Front Left Pedestrian Impact Detection Sensor
  • Front Right Pedestrian Impact Detection Sensor
  • Two Hood Hinge Actuators

 

PIDS Operation

 

PIDS is designed to lift the rear part of the hood when a pedestrian impact is detected during a frontal collision within the approximate calibrated speed range of 14 mph (22 km/h) and 31 mph (50 km/h). When the vehicle is involved in a frontal collision, sensors in the front bumper determine the force applied by the object to the front bumper. Upon identifying the pedestrian, within 40 milliseconds, the system deploys the hood hinge actuators that elevate the rear edge of the hood. (Fig. 10)

 

Fig. 10

 

The system is designed to sense and discriminate road user impacts (e.g. pedestrians and cyclists) from other types of impacts in order to properly deploy the hood actuators. The two sensors located under the outer bumper fascia (Fig. 11) are connected together by a tube (serviced as an assembly) and provide force information to the Inflatable Restraint Sensing and Diagnostic Module to differentiate a human pedestrian from animals and other obstacles. The hood actuators are not expected to deploy in a low severity event where the risk of injury is low or in a high severity event like a vehicle-to-vehicle collision.

 

Fig. 11

 

PIDS may not activate if:

  • The pedestrian impact is outside the range of the sensors.
  • The sensors on the front bumper are damaged.
  • The path of the lifting hood is blocked by snow or ice.
  • Aftermarket equipment is attached to the front bumper.
  • Vehicle speed at impact is outside the calibrated speed range.
  • The vehicle impacts a small object.

 

After Deployment

 

After PIDS has deployed, the hood will remain in the raised position and the driver’s view will be reduced by the raised hood. If a towing service is not available, the hood may be repositioned temporarily. Refer to the Owner’s Manual.

 

The system will not be fully functional again until the hood assembly, including the hinges, latch, and actuators (Fig. 12), are replaced. If the sensors also are replaced, inspect the front fascia and fascia energy absorber for any damage that may interfere with proper system operation.

 

Fig. 12

 

System Disabling during Service

 

PIDS should be disabled when performing repairs to the system or servicing a component near or attached to a PIDS component. The system can be disabled by removing the fuse supplying power to the PIDS or by disconnecting the negative battery cable. Refer to the appropriate Service Information when servicing the system.

 

TIP: Wait one minute before working on any components after disabling the system. PIDS maintains a reserve energy supply that provides deployment power for the hood hinge actuators if the system loses battery power during a collision. Deployment power is available for as much as one minute after disconnecting the vehicle power.

 

– Thanks to Sherman Dixon and Lori Brohl

 

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