Diagnostic Aids (Object Detection System And Pedestrian Protection System)

For symptom byte 21 the module only runs diagnostic when the vehicle is driven greater than 40 km/h (25 MPH). Therefore, even with clean sensor with no obstruction (i.e snow or ice melted off) drive the vehicle greater than 40 km/h (25 MPH).

The following is a list of reasons this failure type byte 21 might have set:

• One or more of the sensors may be blocked by snow, mud, ice or debris. This might happen after going through a car wash in cold weather.
• Silicone insulator surrounding sensor maybe missing, cut or twisted.
• Improperly installed sensor, sensor maybe be crooked due to a tight wire harness.
• One or more of the sensors may be scratched or the paint maybe chipped.
• Excessive paint thickness on a sensor may cause an excessive sensor ring time. When replacing or refinishing a sensor, do not apply an excessive amount of paint or clear coat.