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sprinkles08, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 22683
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Listening to radio in my s400 hybrid and power went

Customer Question

Listening to radio in my s400 hybrid and power went completely dead
JA: Is this an aftermarket stereo, or did it come with the car?
Customer: Factory
JA: What is the model/year of your Mercedes?
Customer: 2010 s 400
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: nothing
JA: Anything else you want the mechanic to know before I connect you?
Customer: a warning came on start engine in 3 minutes or it will shut down
Submitted: 8 months ago.
Category: Mercedes
Customer: replied 8 months ago.
Still waiting
Expert:  sprinkles08 replied 8 months ago.

Hello and welcome to JustAnswer!

If the battery has been allowed to run down then a 12v battery charger is going to need to be applied. Once the battery charger is in place give it about thirty minutes, turn the ignition on. This will allow the inverter to beginning charging the hybrid battery. When the hybrid battery has charged sufficiently to start the engine then the message on the instrument cluster will change from telling you that the battery is charging and say it is ready to start the engine. At that point then the charger can be removed and the engine started.

Here is a link to the relevant information in your owner's manual. I would recommend familiarizing yourself with the procedure and the safety cautions before doing any work as a hybrid vehicle can cause fatal injury.