OVERVIEW
Repair the assigned four-pin harness connection
1K0-973-804 is the Genuine VW/Audi four-pin black electrical contact housing with a contact-locking mechanism. It is used at the specified original harness connection and must be matched to the mating plug and installed terminals.
A broken housing latch can prevent an electrical connection from remaining securely engaged. Replacing the correct housing can restore the mechanical connection while retaining serviceable wires and contacts when the approved repair procedure permits it.
Technical details
- Complete factory number: 1K0-973-804.
- Factory specification: four-pin black contact housing with contact locking mechanism.
- Design: molded electrical housing with application-specific keying and terminal-retention features.
- Quantity supplied: one individual connector housing.
This listing supplies the empty housing shown in the photograph. Repair wires, terminals, seals, mating connector and complete wiring harness are separate. Pin count alone does not establish compatibility or circuit assignment.
Common reasons to replace
- The connector latch is broken and the plug will not remain secured.
- A housing wall or terminal-retention feature is damaged.
- The housing is distorted or damaged by heat.
- An approved wiring repair requires replacement of the original housing.
Inspect the mating connector and terminals for corrosion, heat damage or poor contact tension. Correct the underlying electrical fault and replace affected contacts as directed. A new plastic housing will not repair burned wires or a damaged mating component.
Vehicle fitment
The table separates confirmed original connector locations; the same housing serves different circuits across the listed vehicles. Compare the complete molded number, keying, terminal size and circuit. Do not substitute this housing for another four-pin connector solely by appearance.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Volkswagen Golf | 2015 | 1.8L gasoline or 2.0L TDI | Mk7 hatchback with factory heated seats | Assigned four-pin black seat-heater-element harness connection only. Match original housing, keying and terminal type; not an airbag connector. |
| Audi A4 | 2013 | 2.0L turbocharged gasoline inline-four | B8.5 sedan; original interior wiring-harness coupling | Interior harness coupling explicitly assigned 1K0973804, four-pin black. Match molded number, keying and terminal arrangement; not adjacent ignition-coil or pressure-sensor housings. |
| Audi S4 | 2013 | 3.0L supercharged gasoline V6 | B8.5 sedan; quattro; original interior wiring-harness coupling | Interior harness coupling explicitly assigned 1K0973804, four-pin black. Match molded number, keying and terminal arrangement; not adjacent ignition-coil or pressure-sensor housings. |
| Volkswagen Passat | 2012 | 2.5L gasoline inline-five / 3.6L gasoline VR6 / 2.0L TDI diesel | NMS sedan; original alternator/central harness coupling | Only the original four-pin black alternator-harness or central-harness coupling assigned 1K0973804. Confirm circuit and original housing; not a universal alternator regulator plug. |
| Volkswagen Passat | 2015 | 1.8L turbocharged gasoline inline-four / 3.6L gasoline VR6 / 2.0L TDI diesel | NMS sedan; original alternator wiring coupling | Only the original four-pin black alternator-wiring coupling assigned 1K0973804. Match exact harness, cavity assignment and keying; not every alternator electrical connection. |
| Volkswagen Eos | 2013 | 2.0L turbocharged gasoline inline-four | Convertible; original alternator-harness coupling | Original four-pin black alternator-harness coupling requiring 1K0973804. The separate two-pin dark-brown 6X0973802A is not interchangeable. |
| Volkswagen Beetle | 2012 | 2.5L gasoline inline-five / 2.0L turbocharged gasoline inline-four | A5 hatchback; original central-wiring air-conditioning coupling | Original central-harness air-conditioning coupling assigned 1K0973804. Match original housing and pin/cavity layout; excludes other four-pin connectors and does not add equipment. |
| Volkswagen Beetle | 2013 | 2.5L gasoline inline-five / 2.0L turbocharged gasoline / 2.0L TDI diesel inline-four | A5 Convertible; original central-wiring air-conditioning coupling | Original central-harness air-conditioning coupling assigned 1K0973804. Match housing number and keying. Not the neighboring 25-pin transmission or two-pin heater housing. |
Installation guidance
Use the vehicle-specific wiring repair procedure and proper terminal-release tools. Record the original cavity assignments before removing contacts, install the correct terminals and seals, and engage the secondary contact lock. Preserve the original wiring layout and strain relief.
Verify that every terminal is retained and that the connector latches fully. Check the repaired circuit using the prescribed electrical and functional tests before reinstalling surrounding trim.
Ordering information
One individual Genuine VW/Audi 1K0-973-804 four-pin connector housing. Terminals, wires, seals and the mating connector are not included.