Every control module on the 2025 Mercedes-Benz CLE300 — 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.
Transmission Control Unit (TCU) 2.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Transmission housing, driver side near valve body
🔧 Xentry Diagnostics + SCN online
⚠️ 9G-TRONIC transmission. Requires transmission fluid change during R&R. VIN-locked module.
Electric Power Steering Control Unit (EPS) 2.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Steering column, integrated with steering rack assembly
🔧 Xentry Diagnostics + SCN online
⚠️ Steering angle sensor calibration required after replacement. VIN-locked.
MBUX Head Unit (MBUX/HU) 2.0 hr R&R security gateway +1.5 hr ▸ programming details
📍 Center dashboard, integrated with display screen
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. All user profiles and settings lost. Navigation and media system reconfiguration required.
Electronic Stability Program Control Unit (ESP/ABS) 1.8 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine compartment, left front near wheel well
🔧 Xentry Diagnostics + SCN online
⚠️ Integrated hydraulic unit. Brake bleeding required after replacement. VIN-locked.
Central Gateway Module (CGW) 1.5 hr R&R security gateway +2.0 hr ▸ programming details
📍 Under dashboard, center area behind lower trim
🔧 Xentry Diagnostics + SCN online
⚠️ Critical security module. All vehicle modules may require recoding after CGW replacement. VIN-locked.
Climate Control Unit (CCU) 1.5 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind center dashboard, above center console
🔧 Xentry Diagnostics
⚠️ Requires HVAC system recalibration and actuator adaptation.
Motor Electronics / Engine Control Unit (ME/ECU) 1.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine compartment, left side firewall area near brake booster
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked, requires online SCN authorization from Mercedes servers. Security gateway enforces authentication.
Electronic Ignition Switch (EIS) 1.2 hr R&R security gateway +1.5 hr ▸ programming details
📍 Steering column, integrated with ignition switch assembly
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. All keys must be reprogrammed. Forms security triangle with ECM and cluster.
Signal Acquisition and Actuation Module - Rear (SAM-R) 1.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Trunk area, right side behind trim panel
🔧 Xentry Diagnostics + SCN online
⚠️ Controls rear lighting, trunk functions. VIN-locked.
Instrument Cluster (IC) 1.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Dashboard, behind steering wheel
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. Mileage programming requires dealer authorization and legal documentation.
Door Control Module (DCM) 1.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Inside each door, behind door panel (4 modules total)
🔧 Xentry Diagnostics
⚠️ Window and mirror calibration required after replacement. One module per door.
Radar Sensor / DISTRONIC Control Unit (RSU) 1.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Front bumper, center behind grille emblem
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. Radar calibration with alignment targets required after replacement. Critical for adaptive cruise and collision prevention.
Adaptive Damping System Control Unit (ADS) 1.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Trunk area, left side behind trim panel
🔧 Xentry Diagnostics
⚠️ Optional equipment. Suspension calibration and ride height adaptation required.
Telematics Communication Module (TCM) 0.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Trunk area, left side behind trim panel or under rear seat
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. Mercedes me connect subscription must be reactivated after replacement.
Restraint Systems Control Unit (SRS) 0.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Center console, under front seats mounting area
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. All airbag components must be reconfigured. Battery disconnect required.
Camera Control Unit / Surround View (CCU) 0.8 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Trunk area, right side behind trim panel
🔧 Xentry Diagnostics
⚠️ Camera calibration and alignment required. Processes inputs from multiple cameras.
Intelligent Light System Control Unit (ILS) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Engine compartment, behind each headlight assembly (left and right)
🔧 Xentry Diagnostics
⚠️ LED headlight system. Headlight aim calibration required after replacement.
Trunk/Tailgate Control Module (TGM) 0.8 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Trunk lid, integrated with trunk latch assembly
🔧 Xentry Diagnostics
⚠️ Power trunk calibration and limits must be set after replacement.
Fuel Pump Control Module (FPCM) 0.6 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Trunk area, right side near fuel tank access
🔧 Xentry Diagnostics
⚠️ Fuel system adaptation required after replacement.
Parktronic Control Unit (PTS) 0.6 hr R&R dealer / factory tool +0.4 hr ▸ programming details
📍 Trunk area, center behind trim panel
🔧 Xentry Diagnostics
⚠️ Parking sensor calibration required after replacement.
Wireless Charging Control Unit (WCU) 0.5 hr R&R aftermarket tool +0.2 hr ▸ programming details
📍 Center console, under wireless charging pad
🔧 Xentry Diagnostics or Autel
⚠️ Optional equipment. Simple adaptation only.
Seat Control Module (SCM) 0.5 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Under front seats, driver and passenger side
🔧 Xentry Diagnostics
⚠️ Memory seat positions lost after replacement. Separate modules for driver and passenger seats.
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?
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