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Fitment notes: Location: Rear of the vehicle — trunk/under the rear seat area, mounted alongside the main 12V AGM starter battery (separate from the 48V lithium-ion ISG battery) · Purpose: Voltage stabilization and backup power for redundant, safety-critical electrical systems (braking, steering, and comfort electronics) during start-stop cycles and ISG engine restarts
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Control Modules — 2025 Mercedes-Benz Maybach S-Class
Every control module on the 2022-2026 Mercedes-Benz Maybach S-Class — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
MBUX Head Unit (MBUX/HU)3.0 hr R&Rsecurity gateway +2.0 hr▸ programming details
📍 Center dashboard, integrated with display
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. Software update and personalization settings transfer required. May require COMAND coding on earlier 2022 models.
Climate Control Unit (CCU)2.5 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Behind center dashboard, above center console
🔧 Xentry Diagnostics
⚠️ Multi-zone system. Actuator calibration required after replacement.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Transmission housing or adjacent to transmission tunnel
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked, adaptive values must be reset and relearned. May require transmission removal on some variants.
Airmatic / Active Body Control Module (ABC/ADS)2.0 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Front left wheel well or under front seat area
🔧 Xentry Diagnostics + SCN online
⚠️ E-ACTIVE BODY CONTROL on Maybach. VIN-locked. Ride height calibration and system bleed required.
Signal Acquisition and Actuation Module - Roof (SAM-Roof)2.0 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Overhead console or A-pillar area
🔧 Xentry Diagnostics + SCN online
⚠️ Controls panoramic roof, interior lighting, and rain sensor functions.
Electric Power Steering Control Unit (EPS)2.0 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Steering column or rack housing
🔧 Xentry Diagnostics + SCN online
⚠️ Steering angle sensor calibration required after replacement. VIN-locked.
⚠️ Executive rear seat modules also present. Memory position relearn required.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2025 Mercedes-Benz Maybach S-Class 4.0L Turbo V8 and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.