Fitment notes: Battery located in engine compartment; European H8 equivalent also compatible
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 1988-1989 Mercedes-Benz 300TE — where it lives, replacement time, and what it takes to program a replacement.
Climate Control Module (KE)2.5 hr R&Rno coding
📍 Behind center dashboard climate control panel
⚠️ Electronic climate control on equipped models; vacuum-actuated blend doors. No coding but vacuum system diagnosis often required.
Instrument Cluster (IC)2.0 hr R&Rno coding
📍 Dashboard behind instrument panel
⚠️ Analog cluster with mechanical odometer; no electronic coding. Mileage transfer requires physical gear swap or professional odometer service.
Anti-Lock Brake System Control Unit (ABS)1.8 hr R&Rno coding
📍 Engine compartment, right side near firewall or under hood near master cylinder
⚠️ Bosch ABS 2 system; no coding required but brake bleeding and system test mandatory. Fault codes read via LED flash sequence on module.
Transmission Control Unit (TCU)1.5 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under driver's seat or behind center console kick panel
🔧 Mercedes HHT or Bosch KTS
⚠️ 4-speed automatic (722.3/722.4); shift point adaptation occurs automatically through drive cycle. Early units may have limited electronic control.
Engine Control Unit (ECU)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Engine compartment, left side firewall near brake booster
🔧 Bosch KTS or Mercedes HHT
⚠️ KE-Jetronic with basic electronic control; idle mixture adaptation required after replacement. Most 'coding' is mechanical CO adjustment.
Cruise Control Module (CC)1.0 hr R&Rno coding
📍 Engine compartment, mounted on firewall or near throttle actuator
⚠️ Vacuum-actuated cruise control with electronic module; no coding required. Cable and vacuum system adjustment critical.
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 1989 Mercedes-Benz 300TE 3.0L I6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.