Last updated: July 21, 2026
Fast answer: This supporting page decides whether a sequential tail-light configuration preserves the correct turn, brake, tail, reverse and rear-fog functions for the vehicle’s market. It does not replace the primary Sequential Tail Light Buyer Guide.
Regional Function Matrix
| Evidence | Why it matters | Stop condition |
|---|---|---|
| US/Canada or EU/UK/other market | Rear-fog, reverse and side-marker logic may differ | Seller lists one universal function map |
| Original connector and pinout | Matching shell does not prove matching circuits | No pin/function diagram |
| Brake/turn architecture | Combined and separate signals require different logic | Animation video omits braking and hazards |
| BCM diagnostics | Load monitoring can create warnings or hyperflash | Adapter/coding plan is unknown |
Evidence Before Ordering
- Record vehicle market, generation, facelift and body style.
- Photograph both original lamp labels and connectors.
- Film tail, brake, turn, hazard, reverse and rear-fog functions.
- Obtain the replacement lamp pin/function map.
- Confirm resistors, adapters, coding and warranty support.
Common Questions
Can a US tail light be used on an EU vehicle?
Only after confirming physical fit, every required lamp function, diagnostics and local road-use requirements.
Does a sequential indicator change brake-light behavior?
It can when brake and turn functions share circuits; the exact logic must be demonstrated.
What is the acceptance test?
Test all rear functions independently and together, check warnings and hyperflash, then verify water sealing.
