2001 E-320 Station Wagon - Low Coolant Sensor - Page 2 - Mercedes-Benz Forum
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post #11 of 24 (permalink) Old 05-11-2019, 03:23 PM Thread Starter
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Some update. Today I got few minutes to troubleshoot the issue. I connected my Autel MaxiDiag Elite to read what is causing this message on Instrument cluster. I got message that "Short circuit on signal line to the washer fluid level/coolant level sensor" Code B112B.

Just because I did not have enough time today, so just checked the resistance on windshield washer fluid level sensor, it was only 33.6 ohms while the washer reservoir is full.

Then I measure the resistance from connector of washer fluid connector to backward, it was showing 647 ohms.

While the connector to washer fluid unplug, I went into Autel and reset the code. after that I plug it back in.

For now I am not getting message any more on instrument cluster for Coolant Low level.

One question is the washer fluid level sensor with full level in washer fluid of 33.6 ohms is good reading or bad reading? Please someone can comments on it.

Tomorrow I will try to reach to read resistance of coolant expansion tank level sensor.

Thanks in advance for your continues support.
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Last edited by hadam; 05-11-2019 at 03:28 PM.
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post #12 of 24 (permalink) Old 05-11-2019, 04:27 PM
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What’s the tank ahead of the washer reservoir?

Sixto
98 E320 wagon
02 C320 wagon
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post #13 of 24 (permalink) Old 05-11-2019, 04:27 PM
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Bad reading. You should get between 145 to 185 ohms at the sensor connector with the cable pulled off for a full tank.

The measurement towards the harness connector, 647 ohms is meaningless, especially if the ignition is on (it carries sense power from the cluster).

You always must make these measurements with the ignition OFF.

You may have some stray resistance on the harness to ground.

Typically you need to remove the connector at the back of the instrument cluster and make a measurement from that connector.
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post #14 of 24 (permalink) Old 05-11-2019, 05:31 PM
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Originally Posted by tabijan View Post
What’s the tank ahead of the washer reservoir?

Sixto
98 E320 wagon
02 C320 wagon
Headlight washer fluid.
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post #15 of 24 (permalink) Old 05-13-2019, 10:58 AM Thread Starter
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Quote:
Originally Posted by mrboca View Post
Bad reading. You should get between 145 to 185 ohms at the sensor connector with the cable pulled off for a full tank.

The measurement towards the harness connector, 647 ohms is meaningless, especially if the ignition is on (it carries sense power from the cluster).

You always must make these measurements with the ignition OFF.

You may have some stray resistance on the harness to ground.

Typically you need to remove the connector at the back of the instrument cluster and make a measurement from that connector.
mrboca, thanks. Since I have cleared the code, all is good, I am not getting any messages on Instrument cluster.

I believe the way system is design is that when IC sees the low resistance in the system, it create code B112B and display on IC the message Coolant Low Level. So look like the logic in instrument cluster is that on low resistance or Mercedes call it short circuit, it will display the message Coolant Level Low.

One other observation is that when I removed the connector from washer fluid level sensor, I was getting no message. It means if there is open circuit, the instrument cluster doesn't display any messages.

Anyhow, all the connectors are connected as normal for washer fluid level sensor and coolant expansion tank level sensor. I have been driving the car and no more message.

When I get some time, I am just going to remove the instrument cluster and quickly read the resistance on IC connector IB terminals 4 and 12. This will give me full loop resistance when Coolant Expansion tank is full and windshield washer reservoir is full also. I will keep you posted.
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Last edited by hadam; 05-13-2019 at 11:00 AM.
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post #16 of 24 (permalink) Old 05-13-2019, 11:48 AM
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You probably had an intermittent short on the line which caused the IC to read a short.

I do not think the IC has the capability to display both coolant and the washer fluid low message in case of a short detection on the line, so it displays the washer fluid low message by default, with an error code.

It is also important to note when the actual test is done. In my experience, the washer fluid low message pops up when you turn the contact, and I think it would give implausible value if the test is done when the car is moving due to fluid sloshing in the container. So if you had the fault cleared and then pulled the connector while the key is in position 2, it may not register.
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post #17 of 24 (permalink) Old 05-14-2019, 07:46 AM Thread Starter
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mrboca, thanks for your reply. As of today, I have not seen any more message on IC for Low coolant level.

I will check the circuit from IC side by removing IC and then taking Ohms reading from Electric bracket B just to see what will be the total loop resistance that goes through coolant lever sensor and washer fluid level sensor.

It is quite difficult to read resistance of Expansion tank coolant level sensor, the connector are way in and unless you remove the air box and then expansion tank, there is no simple way to read the resistance. I will read the resistance of Coolant level sensor via IC electrical connector plus washer fluid level sensor connector per attached IC diagram.

I will keep you posted.

The Washer fluid level sensor is quite low cost, it is sold for only $16.

https://www.ebay.com/itm/153337606533?ul_noapp=true

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post #18 of 24 (permalink) Old 05-14-2019, 07:53 AM
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Yeah, follow the procedure, starting with item 3.0 in the attached link.

STAR TekInfo
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post #19 of 24 (permalink) Old 05-14-2019, 09:50 AM Thread Starter
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mrboca, Thank you so much for such a good info on IC and resistance of individual level sensors and over all loop resistance.

I will remove the IC this weekend and will give you update. I believe I have issue with windshield washer level sensor and NOT Expansion Coolant Tank level sensor.

Again many thanks for your time and support.
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post #20 of 24 (permalink) Old 05-18-2019, 04:13 PM Thread Starter
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mrboca, some update. Today I removed the IC and measured the whole loop resistance across Expansion coolant tank level sensor and Windshield washer fluid reservoir level sensor. The Reading I got of 154.8 Ohms. Way lower then I expected, but match what you have told me.

My reading of Windshield washer fluid reservoir level = 33.6 ohms

whole loop resistance across Expansion coolant tank level sensor and Windshield washer fluid reservoir level sensor = 154.8 ohms

It means Expansion coolant tank level sensor 154.8 ohms Minus 33.6 ohms = 121 ohms, which is good.

So my problem is the Windshield washer fluid reservoir level sensor, which suppose to be 145-185 ohms and I am getting only 33.6 ohms.

Thank you mrboca, I will get Windshield washer fluid reservoir level sensor for $16.

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