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1989 BMW 635CSi Bulb Size Chart

Bulb sizes may vary by trim, factory lighting package, region, production date, and previous modifications. Verify the bulb number on your existing bulb before buying.

Last database update: May 2026. Manual review status: Not yet manually reviewed.

Verify before buying: check the bulb number printed on your existing bulb, confirm your trim and factory lighting package, and review the seller's fitment notes.
Disclosure: We may earn a commission from links marked Affiliate. Unmarked retailer links may be plain search links. Always verify bulb fitment before purchasing.

1989 BMW 635CSi Bulb Size Chart

PositionBulb CodeAliasesTrim / PackageFactory TypeConfidenceReviewNotesShop
Side MarkerW5W—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Turn Signal Front7528—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Low Beam9006HB4Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

AmazoneBay
Fog LightH1—If equipped / package-dependentHalogenHigh
Pending

If equipped; fog light packages can vary by trim.

AmazoneBay
High Beam9005HB3Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

AmazoneBay
Parking Light7528—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon

1989 BMW 635CSi Fitment Notes

Across the 1985-1989 production range, our database shows changes in the listed Low Beam, High Beam positions. Use the chart above for this 1989 model, then confirm the bulb number in your vehicle before buying.

Known fitment limitations

  • factory HID or LED packages may use different parts
  • fog lights may depend on equipment package
  • aftermarket headlight assemblies may use different bulbs
  • regional models and production-date splits may differ

See an incorrect bulb size? Submit a correction.

How do the 1989 BMW 635CSi's bulbs compare to other years?

The 1989 BMW 635CSi changed bulb sizes from 1988. The previous model year used a different configuration.

This bulb configuration covers the 1989 model years. ← 1988

Finding the best installation guide...

Other 635CSi Years

198819871985

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9006 / HB4 Comparisons

9005 vs 90069006 vs H11

Frequently Asked Questions

Our database lists 9006 for the 1989 BMW 635CSi low beam headlights. Verify the bulb number on your existing bulb and confirm your trim or factory lighting package before buying.

Our database lists 9005 for the 1989 BMW 635CSi high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 1989 BMW 635CSi can come from aging halogen bulbs, cloudy lenses, weak electrical connections, or an incorrect bulb. Confirm the listed 9006 size against the bulb in the housing before choosing a replacement or upgrade.

Our database lists H1 for the 1989 BMW 635CSi fog light position. Fog lights are often package-dependent, so verify that your vehicle is equipped with factory fog lights before ordering.

The 1989 BMW 635CSi uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

LED upgrades are available for many 9006 applications, but fitment, beam pattern, dashboard warnings, and road-use legality can vary. Use products that list your exact bulb family, such as 9006 / HB4, and verify the factory housing before buying.

Our database has a fog light entry for the 1989 BMW 635CSi: H1. Fog lights may still depend on trim or equipment package.

Yes — the 1989 BMW 635CSi uses different bulb sizes than the 1988 model. The 1989 generation introduced this bulb configuration.

The 1989 BMW 635CSi is the only year in the 1989 generation to use the 9006 bulb for the low beam headlight.

Access varies by engine bay layout and headlight housing. Before disassembly, confirm the listed 9006 low beam size on the existing bulb or owner's manual, then follow the service procedure for your exact trim.

Rules for LED headlight retrofits vary by location and by housing type. Avoid products that create glare or lack road-use compliance claims, and check local requirements before using an LED conversion on public roads.

Replacement cost depends on bulb technology, brand, and labor access. Common halogen 9006 replacements are usually cheaper than LED conversion kits. Check seller fitment notes before comparing prices.

Halogen bulbs and LED replacements differ in output, heat behavior, beam pattern, and electronics. A correct bulb code does not guarantee a correct LED beam pattern, so verify physical fit and seller compatibility notes for the 1989 BMW 635CSi.