Fitment notes: Battery located in engine compartment; European DIN specification
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Every control module on the 1986-1989 Mercedes-Benz 300SEL — where it lives, replacement time, and what it takes to program a replacement.
Climate Control Module (KE)1.8 hr R&Rno coding
📍 Behind center dashboard climate control panel
⚠️ Electronic climate control on later models; vacuum system diagnosis often needed alongside electronic faults
Instrument Cluster (IC)1.5 hr R&Rno coding
📍 Dashboard behind instrument panel
⚠️ Electromechanical with some electronic displays; odometer mileage transfer required
Engine Control Unit (ECU)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Under passenger seat or behind right kick panel
🔧 Bosch KTS or Mercedes HHT
⚠️ KE-Jetronic with electronic control; idle speed and mixture adaptation required; fault codes via 38-pin connector
Transmission Control Unit (TCU)1.0 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under driver seat or center console area
🔧 Mercedes HHT
⚠️ Electronic 4-speed automatic (722.3/722.4); shift point adaptation required after replacement
Anti-Lock Brake System Control Unit (ABS)0.8 hr R&Rno coding
📍 Engine compartment, driver side firewall area
⚠️ Bosch ABS 2 system; no coding but brake system bleed procedure critical after replacement
Supplemental Restraint System Control Unit (SRS)0.7 hr R&Rno coding
📍 Center console or under front seats
⚠️ Introduced 1988-1989 model years; battery disconnect and 15-minute wait required before service
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 300SEL 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 Lexus & Toyota Mechanic · 20+ years.