Removing and installing crash sensor 2 for pedestrian protection G851 and G852 — AUDI

🧭 Before you start

Fits: Audi A3 (8V, 2012–2020); platform code 85

Don't miss

• Not all pressure hoses (2) have a coloured marking (3).If you are using a pressure hose (2) without a coloured marking (3), measure and mark the middle of the hose.
• Secure moulded foam insert (1) to bracket on both sides with cable ties (2); cable tie fastener (arrow) must be located at bottom of moulded foam insert.
• Make sure electrical connectors are fitted correctly (as far as stop) and engage audibly.Make sure that wiring is not trapped.
• If the airbag warning lamp K75 indicates a fault following installation, you must interrogate, erase and then re-interrogate the event memory .

📋 Procedure

1. ⚠ Observe safety precautions when working on pyrotechnic components . — With ignition switched on, disconnect battery earth wire Electrical system27Battery; Disconnecting and connecting battery.
2. Remove moulded foam insert General body repairs, exterior63Bumper (front); Removing and installing attachments.
3. Remove spreader rivets (1, 4) and detach crash sensor (3) for pedestrian protection from bracket.
4. ⚠ Before handling pyrotechnic components (e.g. unplugging the electrical connector) the mechanic must discharge any static electricity. This can be done by briefly touching the door striker plate, or similar. — Unplug electrical connector (2).
5. To do so, pull out and press down connector locking element (2)(arrow) and unplug electrical connector (1) at crash sensor.

6. Repeat procedure on opposite side.
7. ⚠ Observe safety precautions when working on pyrotechnic components .Before handling pyrotechnic components (e.g. plugging in the electrical connector) the mechanic must discharge any static electricity. This can be done by briefly touching the door striker plate, or similar. — Insert pressure hose (2) in recess in moulded foam insert (1), ensuring that coloured marking (3) is aligned with marking (4) on moulded foam insert. [Note: Not all pressure hoses (2) have a coloured marking (3).If you are using a pressure hose (2) without a coloured marking (3), measure and mark the middle of the hose.]
8. Insert pressure hose into recess in moulded foam insert evenly in both directions (arrows).
9. ⚠ Do not kink or stretch the pressure hose. — Install moulded foam insert with crash sensors for pedestrian protection General body repairs, exterior63Bumper (front); Removing and installing attachments.
10. Install crash sensor (4) for pedestrian protection with spreader rivets (3, 5) on bracket.
11. Secure moulded foam insert (1) to bracket on both sides with cable ties (2); cable tie fastener (arrow) must be located at bottom of moulded foam insert.
12. Attach connector (1) to crash sensor (arrow) so that it engages audibly.
13. Press in connector locking element (2) to secure connector. [Note: Make sure electrical connectors are fitted correctly (as far as stop) and engage audibly.Make sure that wiring is not trapped.]
14. ⚠ The battery must be connected with the ignition switched on. If pyrotechnic components (e.g. airbag or belt tensioner) are inexpertly repaired, this may result in unwanted triggering after connecting the battery. There must not be anyone in the area of the bonnet when the battery is being connected. — With ignition switched on, connect battery earth wire Electrical system27Battery; Disconnecting and connecting battery. [Note: If the airbag warning lamp K75 indicates a fault following installation, you must interrogate, erase and then re-interrogate the event memory .]

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