I'm familiar with the various dash indicators on my W210s. And I know how to read codes, both with a code reader and the climate control codes via the control panel. What I can't seem to find a list of are the various verbal message that could come up on the main display (e.g. low oil, low coolant, etc.). Does anyone know where to find such a list?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

BAS - is what the 99's message has been reading.

No, I don't know of a list.

The list of icons and messages is in the owners manual.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

OK...so I gather the messages listed in the manual are complete. I was wondering in particular about low ATF and low power steering fluid. But I guess those are not monitored.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I've had a coolant light come on my W210 and many others, Oil Light. If the fluid was low, it'd most likely go into limp mode to preserve the transmission.

Power steering? No that is not one that is displayed nor have I ever seen it.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

I don't believe so.

Basically the dash display is a glorified system that expands upon the warning lights at the bottom of the 124 cluster. The low coolant, low oil, low wiper fluid, bulb out, brake pad warnings are in there. Plus some new ones such as reminder to release the parking brake. And it integrates the temperature and the clock displays.

The other thing that is noticeably absent in the 210 is the oil pressure gauge. The filter tower on the 606 has a plug where the sensor should be on the older models.

The engineers did one clever (?) thing with the low coolant and low wiper fluid sensors. The sensors are not simple on-off switches, they are on-off switches with resistors in series and resistors across the switch contacts. The coolant and washer sensors are connected in series and run to one analog input port on the front SAM module. By the measured resistance it can determine the state of the two switches. However, if one of the sensors fails, then the resistance will be out of bounds, and it will show Display Defective on the cluster.

Power steering fluid is not monitored. You would hear it start complaining if it was low.

There is a fluid level sensor on the conductor plate. However I suspect that if the fluid got that low you would get a Check Engine light and transmission codes thrown rather than a message on the cluster. When that happens it says Check Engine Electronics.

BAS is the Brake Assist System. It is a reserve of vacuum in the booster (beyond the normal amount) that is released when it is determined that the brake pedal is applied hard and fast. It provides the maximum amount of braking force available. It uses a solenoid and sensor in the brake booster.

Since the brakes are safety critical and especially if your son is driving the car, I would have a dealer or indy diagnose this.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech