YWZ10003L | Dim Dip Control Unit - Glow Plug Timer | Defender 1987-2006
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To check the stock of Genuine Parts before placing an order please use our Contact Us page
Land Rover Part Number: YWZ10003L - Dim Dip Control Unit
YWZ10003L is a Dim Dip Control Unit that sits within the vehicle's body electrics. It governs dim-dip headlamp behaviour - reducing main beam output to a low-level illumination in parking or other dim-dip conditions - and provides a timed output for the glow plug circuit on diesel models during starting. The unit interfaces with the vehicle's relay wiring, switching low-current control signals to the appropriate relays and timers that operate the headlamps and glow plugs. Correct function affects both external lighting behaviour and pre-ignition glow duration; faults may result in incorrect headlamp dimming or incorrect glow plug timing. Use the compatibility data below to confirm fitment against your V.I.N.
Compatibility
- Defender (1987-2006) - L315
Frequently Asked Questions
This electronic control unit manages dim-dip headlamp behaviour and provides the timed output for the glow plug circuit on diesel Defenders. It interfaces with the vehicle's body electrics and relay wiring, switching low-current control signals to the relays and timers that operate the headlamps and glow plugs. Faults typically present as incorrect headlamp dimming or incorrect glow plug timing, which can affect starting and lighting behaviour.
| Model | Variant |
|---|---|
| Land Rover Defender (1987-2006) | Dim Dip Unit & Glow Plug Timer (L315) |
If you are unsure of compatibility with your vehicle, you can also confirm by checking against your V.I.N. Simply reach out to us with your V.I.N and desired part number via our Contact page or use our Finding Part Numbers page.
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