Description
The part number A29803202 (often written as A 298 032 02) refers to the Electronic Ignition Switch (EIS) module used in Mercedes-Benz vehicles. The EIS is a critical component in the vehicle’s starting and immobiliser system: it reads the key, authorises starting, communicates with other modules, and ensures vehicle security.
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Many EIS units fail or show intermittent issues (key not turning, no-start, steering lock issues) and are listed by specialist repair services as the root cause of such faults. Mercedes-Benz Owners’ Forums+2JustAnswer+2
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Specialist sites describe EIS failures and offer diagnosis/repair for Mercedes-Benz ignition switch modules. Injectronics+1
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Because of the security network in modern Mercedes vehicles, replacing an EIS often requires programming/coding and synchronisation with keys, the steering lock (ESL) and other modules. JustAnswer+1
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Note: Although I found references confirming EIS modules generically, I was unable to find a public listing that explicitly confirms the OE number “A29803202” (as opposed to the more common A164545… or A210545…). So I advise verifying this number via your VIN or Mercedes parts catalogue to ensure exact match.
Key functions & implications:
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When working properly, the EIS accepts/inserts the key (or reads the key-fob/coil), unlocks the steering column, allows the start button/ignition to operate, and sends the proper signals to the engine control unit.
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If faulty or mismatched, symptoms might include: key not recognised, key won’t turn, vehicle won’t crank or start, steering lock remains engaged, fault codes stored in modules. JustAnswer+1
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Replacement requirements: remove original, install new unit, then coding via Mercedes diagnostic tools (Xentry/Star) or via a specialist. It is not a simple plug-and-play in many cases.
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