Removing and installing high-voltage wire for high-voltage heater (PTC) — AUDI

🧭 Before you start

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

🔧 Engine codes this applies to

📐 45 workshop diagrams for CJZA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. ⚠ High voltage can cause fatal injury.Danger of severe or fatal injuries from electric shock.The high-voltage system must be de-energised by a suitably qualified person (an Audi high-voltage technician). — De-energise high-voltage system .
2. Remove noise insulation (rear) General body repairs, exterior66Noise insulation; Removing and installing noise insulation.
3. Remove bolt (4) and nuts (1).
4. Move high-voltage heater (PTC) to one side (coolant hoses remain connected).
5. Disconnect high-voltage wire (3) from high-voltage heater (PTC) (2).

6. Pull out locking element (3)(arrow A) to unplug electrical connector.
7. Press release tab (4) in direction of (arrow B) and pull connector (1) approx. 5 mm to next release level.
8. Press release catch (5) in direction of (arrow D) and pull connector off connector mounting (2)(arrow C).
9. Move high-voltage wire (3) clear.
10. Disconnect high-voltage wire (2) from charging unit 1 for high-voltage batteryAX4(item 1).
11. Pull out locking element (3)(arrow A) to unplug electrical connector.
12. Press release tab (4) in direction of (arrow B) and pull connector (1) approx. 5 mm to next release level.
13. Press release catch (5) in direction of (arrow D) and pull connector off connector mounting (2)(arrow C).
14. Remove high-voltage wire.
15. Installation is carried out in the reverse order; note the following:
16. ⚠ High voltage can cause fatal injury.Danger of severe or fatal injuries from electric shock.The high-voltage system must be re-energised by a suitably qualified person (an Audi high-voltage technician). — Re-energise high-voltage system .

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