Date registered: Sep 2011
Vehicle: 2004 E320 wagon 4-Matic
Location: Minneapolis, Minnesota
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
2004 E320 - Red Battery "Visit Workshop" - Is it the Relay or Main battery
Hoping someone here can provide guidance...
I have been having the Red Battery "Visit Workshop" error for a while now. The message comes on immediately after starting the car. When it first started happening, it would clear itself after driving for an hour or so. Now it comes on every time I start the car and does not clear itself.
I assumed it was the aux battery and replaced that a month ago, but it made no difference.
The last few days I have accessed the service menu before starting the car, and find the battery voltage to be anywhere from 12.0 volts to 13.2 volts before starting the car. As soon as it starts, voltage jumps to around 14.1 volts.
I am suspecting either the main battery or the aux battery relay. The battery is not new, but seems to be holding a charge fine, so I hate to drop $150 on a new one if it is the relay. The relay I would have to order and is not returnable, so I also hate to spend $60 on that if it is not needed.
I am wondering if there is a way I can test the relay to determine which is the culprit, or if these symptoms help to diagnose? Or is there something else I should consider as the problem?
In case this is relevant, last winter it was not uncommon when starting the car below zero degrees to have the "Battery Protection - Convenience Functions Unavailable" message pop up for about a minute, but it always went away. The car always starts fine and does not seem to have a weak battery.
Any insight is appreciated!
CURRENT: 2004 E320 WAGON 4-MATIC. Astral Silver.
RIP: 1987 300SDL "Eve" - 275K Miles. Automatic. Astral Silver w/Blue Interior & Power Rear Seats