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BMW pedestrian protection system fault reset

BMW Pedestrian Protection System Fault Reset – Detailed Guide

1. What is the BMW Pedestrian Protection System?

The BMW Pedestrian Protection System (PPS) is a safety feature designed to reduce injuries to pedestrians in the event of a collision. When the system detects a potential impact, small pyrotechnic actuators lift the rear edge of the hood (bonnet) within milliseconds. This creates more space between the hood and engine components, softening the blow to the pedestrian.

This system is typically installed in newer BMW models (especially in the 3, 5, and 7 Series, and some X models).

2. Common Causes of a Pedestrian Protection System Fault

A fault may appear on the dashboard as:
“Pedestrian Protection System Malfunction” or “Pedestrian Protection System Fault”.

Possible causes include:

Accidental deployment of hood actuators (e.g., hitting a pothole or curb hard).
Faulty or damaged hood actuators.
Wiring or connector issues in the PPS circuit.
Battery low voltage or voltage spikes.
After an accident or front-end collision.
Water ingress in the control module or sensors.

3. Can You Reset the Fault Manually?

No — you cannot reset the Pedestrian Protection System fault manually through the iDrive menu. Because the system involves pyrotechnic devices, the fault requires a proper diagnostic tool and inspection to reset.

4. How to Reset the PPS Fault (Step-by-Step)

Step 1: Diagnostic Scan

You need a professional BMW-compatible diagnostic tool, such as:

BMW ISTA/D (BMW’s official diagnostic software)
Autel MaxiSys
Launch X431
Foxwell NT530 (BMW version)

Connect the tool to the OBD-II port under the dashboard and scan for fault codes.

Step 2: Inspect the System

Depending on the fault codes, check:

The hood actuators (left and right) for deployment or damage.
The PPS control unit/module.
Any wiring or connectors for corrosion, breakage, or water damage.
Front crash sensors near the bumper.

If the actuators have deployed, they must be replaced. These are one-time use parts.

Step 3: Replace Faulty Parts

Replace any components flagged during diagnostics:

Deployed actuators
Damaged wiring
Control module (if shorted)

Clear the fault codes once all components are in working order.

Step 4: Reset Using Diagnostic Tool

Use the diagnostic tool to:

Clear DTCs (Diagnostic Trouble Codes)
Reset the PPS system
Run a function test if supported

Step 5: Test Drive and Recheck

After clearing the codes and resetting, perform a short drive. Re-scan the system to ensure the fault hasn’t returned.

5. Additional Tips

If the vehicle was in an accident, insurance may cover actuator or system replacement.
Disconnect the battery when working on pyrotechnic devices.
The reset should always be done by a professional if you’re unsure, as incorrect handling could cause further damage or safety risks.

Would you like a step-by-step visual diagram of the system and reset process?