Cheap keyless entry for a BMW E30 (LB-402 AliExpress):
You can add keyless entry to an E30 for under ~$20 using an LB-402 keyless entry kit. The LB-402 ties into the factory Central Locking Control Unit (CLCU) by triggering the E30’s lock/unlock request inputs.
Where the E30 central locking module is:
The CLCU is in the front driver’s kick panel area, behind/below the driver kick panel speaker.
Quick access steps (LHD cars):
1. Disconnect the battery (recommended).
2. Remove the driver kick panel / speaker cover.
3. Remove the speaker.
4. Reach through the speaker opening — the central locking module sits downward/behind that opening on a bracket. Unplug the connector to access wiring.
*(RHD cars: same idea, mirrored to the driver side.)*
| LB-402 (AliExpress) wire color | Central locking module pin | Original E30 wiring color | Function / notes |
|---|---|---|---|
| Orange | — | — | Not used (blank) |
| White | Pin 7 | Yellow/Blue | Lock request input |
| Yellow | Pin 4 | Brown | Ground |
| Orange/Black | — | — | Not used (blank) |
| White/Black | Pin 6 | Green/Blue | Unlock request input |
| Yellow/Black | Pin 4 | Brown | Ground |
| Black | Pin 4 | Brown | Ground |
| Red | Pin 3 | Red/Brown | Power |
| Brown | — | — | Not used (blank) |
| Green | — | — | Not used (blank) |
| Blue | — | — | Not used (blank) |
Its also possible to make an inline plug-and-play harness, with the use of a 3D printer to make the connectors and some JPT pins:
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