2003-2009 MERCEDES SL500 BATTERY STABILIZATION CONTROL MODULE A 230 540 0945

🟩 2003–2009 Mercedes-Benz SL-Class Battery Stabilization Control Module — OEM

Part Number: A 230 540 09 45 (2305400945)

Common Name: BCM (Battery Control Module) / Dual Battery Controller

Location: Trunk Compartment (Adjacent to Accessory Battery)

Vehicle Removed From: 2003 Mercedes-Benz SL500 Roadster (R230)

VIN: WDBSK75F93F018957 (92,991 Miles)

Condition: Tested • Cleaned & Sanitized • 30 Day Warranty • Free Returns

🔧 Item Description

• Genuine Mercedes-Benz OEM Battery Stabilization Control Module.

• Fits R230 SL-Class models for the 2003–2009 production range.

• This critical module manages the R230's dual-battery system, regulating the charging and power distribution between the front (Starter) battery and the rear (Accessory/Consumers) battery.

• Removed from a functional vehicle with a healthy electrical system and no "Consumer Units Switched Off" messages.

✅ Functionality & Testing

• ✔️ Charging Logic: Tested for correct voltage switching; verified the module properly engages the alternator to charge both batteries.

• ✔️ Emergency Parallel Function: Verified the internal relay correctly bridges batteries for emergency starting when the starter battery is low.

• ✔️ Diagnostic Verification: Scanned with professional diagnostic tools; confirmed 100% CAN-bus communication and zero internal microprocessor faults.

• ✔️ Electrical Integrity: All high-current threaded terminals and multi-pin signal ports are clean, bright, and free of any signs of overheating or electrical arcing.

🧼 Condition & Inspection

• Professionally cleaned and sanitized.

• ⚠️ Heat & Moisture Inspection: Rigorously inspected for the most common BCM failure: zero thermal damage or corrosion. The internal circuit board is pristine and has never been exposed to trunk moisture.

• Housing: The protective plastic casing is intact with all mounting points and terminal covers solid.

🚗 Vehicle Compatibility Mercedes-Benz SL-Class (R230)

• 2003–2006 SL500

• 2007–2009 SL550

• 2003–2008 SL600

• 2003–2008 SL55 AMG

• 2005–2009 SL65 AMG

• ⚠️ Fitment Note: Please verify your original part number is 230 540 09 45. This is a direct replacement for this specific version of the battery management system.

⚙️ Features & Benefits

• OEM Reliability: Essential for resolving "Consumers Offline" errors and battery drain issues common in the R230 chassis.

• Direct Fit: Designed specifically for the SL-Class trunk layout; bolts directly to the factory mounting location.

• Genuine Quality: Engineered by Mercedes-Benz to handle high-amperage loads reliably, ensuring your sensitive vehicle electronics receive stable voltage.

🛡️ Warranty & Returns

• ✔️ 30 Day Warranty — Guaranteed electronic and signal functionality.

• ✔️ Free Returns — Shop with total confidence.

• ✔️ Tested & Cleaned