Every control module on the 2024-2026 Mercedes-Benz GLS450 X167 — 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.
Drive Pilot Control Unit (DP) 2.5 hr R&R security gateway +1.5 hr ▸ programming details
📍 Behind MBUX head unit or integrated with CGW
🔧 Xentry Diagnostics + SCN online
⚠️ Level 3 autonomous driving (select markets, 2024+). Requires extensive calibration and online authorization.
MBUX Head Unit (HU/MBUX) 2.5 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Center dashboard, integrated with display
🔧 Xentry Diagnostics + SCN online
⚠️ Requires dashboard trim removal. SCN coding for navigation, audio system, and vehicle options. Updated MBUX 2.0 software.
Transmission Control Unit (TCU) 2.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Transmission bell housing, driver side
🔧 Xentry Diagnostics + SCN online
⚠️ 9G-TRONIC transmission. Requires transmission fluid drain, SCN coding, and adaptive learning drive cycle.
Roof Signal Acquisition and Actuation Module (SAM-Roof) 2.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Headliner, above driver's head near sunroof controls
🔧 Xentry Diagnostics
⚠️ Controls sunroof, interior lighting, rain sensor. Headliner removal required.
Camera Control Unit / Surround View (CCU) 2.0 hr R&R dealer / factory tool +1.0 hr ▸ programming details
📍 Behind MBUX head unit, center dashboard
🔧 Xentry Diagnostics
⚠️ 360-degree camera system. Requires camera calibration and alignment after coding.
Climate Control Unit (CCU) 2.0 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Behind center dashboard, above center console
🔧 Xentry Diagnostics
⚠️ Dashboard removal required. Coding for vehicle configuration and refrigerant type.
Electric Power Steering Control Unit (EPS) 1.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Steering column, below instrument panel
🔧 Xentry Diagnostics + SCN online
⚠️ Requires steering angle sensor calibration and SCN coding after replacement.
Electronic Stability Program Control Unit (ESP/ABS) 1.5 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine bay, left front corner near brake master cylinder
🔧 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 +1.5 hr ▸ programming details
📍 Behind glove box, right side of dashboard
🔧 Xentry Diagnostics + SCN online
⚠️ Security gateway. Replacement requires dealer-level authorization and all module re-coding.
Electronic Ignition Switch (EIS) 1.2 hr R&R security gateway +1.5 hr ▸ programming details
📍 Steering column, integrated with ignition switch
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. Key programming and ECM/TCM pairing required. All keys must be present.
Motor Electronics / Engine Control Unit (ME/ECU) 1.2 hr R&R security gateway +1.0 hr ▸ programming details
📍 Engine bay, left side firewall behind air filter housing
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked, requires online SCN coding and EIS pairing. Aftermarket tools cannot complete coding.
Tailgate Control Module (TGM) 1.2 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Tailgate, behind interior trim panel
🔧 Xentry Diagnostics
⚠️ Power liftgate. Coding for hands-free operation and height memory.
Airmatic Control Unit (ADS/Airmatic) 1.0 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Rear cargo area, left side behind trim
🔧 Xentry Diagnostics
⚠️ Air suspension with E-Active Body Control (2024+). Requires ride height calibration and coding.
Instrument Cluster (IC) 1.0 hr R&R security gateway +1.0 hr ▸ programming details
📍 Instrument panel, 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 aftermarket tool +0.3 hr ▸ programming details
📍 Inside each door (four modules total)
🔧 Xentry or Autel MaxiSys
⚠️ Door panel removal required. Coding for window, mirror, and lock functions.
Fuel Pump Control Module (FPCM) 1.0 hr R&R dealer / factory tool +0.3 hr ▸ programming details
📍 Under vehicle, mounted to fuel tank
🔧 Xentry Diagnostics
⚠️ Vehicle lift required. Coding for fuel type and pump parameters.
Trailer Module (TM) 1.0 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Rear cargo area, integrated with SAM-R or separate module
🔧 Xentry or Autel MaxiSys
⚠️ Factory trailer hitch option. Coding for trailer detection and lighting.
Restraint Systems Control Unit (SRS) 0.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Center console, beneath front armrest
🔧 Xentry Diagnostics + SCN online
⚠️ VIN-locked. Requires SCN coding and crash data verification. Battery disconnect mandatory.
Intelligent Light System Control Unit (ILS) 0.8 hr R&R dealer / factory tool +0.5 hr ▸ programming details
📍 Each headlight assembly (left and right)
🔧 Xentry Diagnostics
⚠️ Digital Light LED headlights (2024+). Headlight aim calibration required after replacement.
Parktronic Control Unit (PTS) 0.8 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Behind rear bumper, center
🔧 Xentry or Autel MaxiSys
⚠️ Bumper removal required. Sensor calibration after replacement.
Active Lane Keeping Assist Control Unit (ALKA) 0.8 hr R&R dealer / factory tool +0.8 hr ▸ programming details
📍 Windshield, behind rearview mirror
🔧 Xentry Diagnostics
⚠️ Camera-based lane keeping. Windshield calibration required after replacement.
Telematics Communication Module (TCM) 0.8 hr R&R security gateway +0.8 hr ▸ programming details
📍 Rear cargo area, left side panel behind trim
🔧 Xentry Diagnostics + SCN online
⚠️ Mercedes me connect module with 5G capability (2024+). Requires online activation and subscription transfer.
Seat Control Module (SCM) 0.6 hr R&R aftermarket tool +0.3 hr ▸ programming details
📍 Under each front seat (driver and passenger)
🔧 Xentry or Autel MaxiSys
⚠️ Seat removal required. Coding for seat options (heating, ventilation, massage).
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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