1kvcdcg¶

1 excerpts.

Reddit thread: Advice¶

reddit.com/r/SmartCar/comments/1kvcdcg · p. 1 · Applies to: 450

Source: r/SmartCar (score 38, 13 comments) Topic: reverse polarity damage, dashboard/gauge cluster failure Models discussed: 450 Solution status: unclear

Problem: After reverse polarity jump start on 05 Smart Roadster, all dashboard instruments stopped working - no speedo, fuel gauge, or other dash display.

Solution: Check and replace blown fuses in fusebox first. If fuses are intact, the dash/gauge cluster or SAM unit is likely fried from reverse polarity damage and requires replacement with a used unit of lower mileage (approximately £30-£40). May need Star diagnosis coding if using a used SAM. Reference evilution.co.uk for detailed fixes.

Key facts: - Reverse polarity jump start can fry dash cluster or EMU (ECU) in Smart Roadster - First diagnostic step is to check all fuses in fusebox - blown fuses can cause complete dash blackout - If fuses are okay, gauge cluster/SAM unit is fried and requires replacement with used unit at lower mileage - Used SAM units available for £30-£40 but may require Star diagnosis coding to function properly - Some sources recommend turning on lights before jump starting to prevent electrical spikes