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barbaraice1

Mercedes EQC won't start Terminal ignition positive interrupted

My 2019 Mercedes EQC electric car won't start It has 279402 km on it I'm getting an error message 'Terminal 15 ignition positive interrupted' The diagnostic says it's likely a defective cable or plug connection and the fix is quoted at 95€ Any ideas what could be causing this circuit break Is it a bad relay switch or something more to do with the wiring harness or power supply

Summary of the thread

A 2019 Mercedes EQC electric car with 279,402 km displayed an error message, 'Terminal 15 ignition positive interrupted,' indicating a starting issue. The problem was likely due to a defective cable or plug connection. The solution involved checking the wiring harness and plug connections related to the ignition switch and engine control unit. A workshop identified a corroded connector on the main wiring harness, cleaned it, and resolved the issue, aligning with the initial diagnostic cost estimate.

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4 comment(s)

julialion1

Terminal 15 is the switched positive power supply Check the wiring harness and plug connections related to the ignition switch and engine control unit The error memory points to a defective cable or plug so start there

barbaraice1 (community.author)

Okay thanks But where exactly should I be looking for these connections Is there a common spot in the EQC where the wiring harness tends to fail or the plug connection goes bad

julialion1

Without seeing the car it's hard to say specifically Given the error and potential causes it's likely related to the power supply to the engine control unit A workshop would be able to pinpoint the exact location

barbaraice1 (community.author)

Understood Thanks for the info I took it to a shop They found a corroded connector on the main wiring harness causing the interrupted power supply to terminal 15 They cleaned it and the car started right up The cost was around 95€ like the initial diagnosis said

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MERCEDES

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EQC