Hi, our 2001 C320 still has battery drain issues. After changing the battery, the seat module was unplugged the drain stopped for a good 2 months. Now it's draining after a day. I think the SOS tele aid issue is a factor. Also the alarm goes off out of the blue. Any solutions to stop the drain? I can't unplug everything.

Anonymous Posted on Aug 10, 2012

Battery still drains. Seat modules unplugged already

Hi, our 2001 C320 still has battery drain issues. After changing the battery, the seat module was unplugged the drain stopped for a good 2 months. Now it's draining after a day. I think the SOS tele aid issue is a factor. Also the alarm goes off out of the blue. Any solutions to stop the drain? I can't unplug everything.

1 Answer

Marvin

Mercedes-Benz Master 85,242 Answers
Posted on Aug 10, 2012

Marvin

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A Miller

8404 Answers
Posted on Jun 20, 2011

SOURCE: Mercedes E320 CDI 2004 AVENTGARDE.If

Find your fuse panel. Take a picture of it with your cell telephone. With the car off, with a volt meter, remove the fuses one at a time. Measure every slot to find out what is hot and what is not. Any Hot circuits should be examined closely to find out what is ON when the car is OFF.

Places to look ... light in the trunk??? is it on or off with the lid closed? Under the hood? Same. Do you have a radio that comes on with the key off??? GPS, you leave plugged in? Cell phone or other gadgetry you may have plugged in to the aux power supply? Any other lights? Parking lights for example? Security system? CB radio?

After you have checked these items, and if you find nothing, you may want to have your alternator examined. If you have a shorted diode in the alternator, the power may be draining back to ground through this shorted diode. You could perform this test yourself by unplugging or disconnecting the alternator during the periods when you are not driving the car. If this is the trouble, on day three, when you reconnect the alternator, two things you will note: 1) there will be a pretty big spark & 2) you will still have charge in the battery (evidenced by the spark)(there will be some spark no matter what ... but a big spark will mean a big drain). I have seen shorted diode problems fixed by inserting a toggle switch in the alternator power circuit. The alternator will still charge the battery when the switch is ON with the car running. When you stop the car, turn the switch off, power will not drain through the alternator to ground. Probably not the solution for your Mercedes. The real solution is to replace the alternator.

BTW - do you have a security system in your car? A thief proof radio? Check your owner's manual for precautions you should take before disconnecting your battery with regard to the anti theft features of your vehicle.

You say your battery is new and dead after three days. If fully charged on day one, and dead on day three, that means your battery has expended between 500 (economy battery) and 1000 (premimum battery) "amp hours" of power (500 amps / 72 hours = about 7 amps per hour going somewhere. (An 'amp hour' is one amp for one hour) Ohm's Law applies.

I hope you find your trouble and I hope I have given you a few leads. Thanks for allowing me to assist you with this problem this morning ... good luck.

Thanks for using FixYa.com today.

Dar

2007 Answers
Posted on May 08, 2009

SOURCE: I need to find the fuse for the driver seat in a 2001 C 320 merce

They usually have a circuit breaker, which is also in your fuse box, but you are probably wiser to find the plug-in for your seat, because fuses and breakers often control more than one thing. Trace the wires back from your seat until you find a connection, and unplug it.

Anonymous

3 Answers
Posted on Oct 03, 2009

SOURCE: Battery drain in MB C320

Unplug the power seats.

Anonymous

752 Answers
Posted on Jul 09, 2011

SOURCE: I towed my car on a car carrier across country 6

Disconnect the positive lead of the battery and hook a simple test light from that lead to the positive post of the battery. The light will come one for a second and go out. If it stays on you can start looking for the short by one by one pulling fuses going to circuits that don't need the keys to work. The frist thing befiore starting this test is to unplug the hood light if you have one. If the courtesy light isn't the problem, pull that fuse and you can do the rest of the testing with the doros open. Good luck.

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1helpful

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I need to know where the seat memory module is on a 2001 Buick park avenue, and how do i disconnect it?

How do you know it's the seat memory module ? It is located on the bottom of the driver seat .
Memory Seat Control Module Replacement

Raise the seat to the full upright position.
Unsnap the front track cover from the seat by sliding forward.
Remove the 2 front screws from the memory seat module bracket.
Remove the front seat anchor bolts from the rear of the seat tracks.
Raise and support the rear of the seat assembly.
Disconnect the electrical connector.
Remove the 2 rear fasteners from the bracket.
Remove the memory seat module (1) and the bracket.

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Feb 06, 2017 • 2001 Buick Park Avenue

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Why does my battery drain over night on my 2003 cheverolet 2500 hd

One of the modules may be doing it , interior light lit -glove box ! Hard to say on newer vehicles , after 1996 ! You vehicle has some of these modules if not all !
The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
?€¢
The body control module (BCM)

?€¢
The digital radio reciever

?€¢
The driver door module (DDM)

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The electronic brake control module (EBCM)

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The front passenger door module (FPDM)

?€¢
The HVAC control module

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The inflatable restraint sensing and diagnostic module (SDM)

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The instrument panel cluster (IPC)

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The memory seat module (MSM)

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The powertrain control module (PCM)

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The radio

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The radio amplifier

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The rear seat audio (RSA) controller

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The rear seat entertainment (RSE) assembly w/U42

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The rear wheel steering control module

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The remote playback device-CD player w/U1S

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The transfer case shift control module

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The transmission control module (TCM) w/Allison Transmission

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The theft deterrent control module

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The way to find the drain on the battery is to do a Parasitic Draw Test ! I'll send a link for Eric the car guy !
How To Perform Parasitic Draw Test EricTheCarGuy

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Mar 11, 2015 • Cars & Trucks

0helpful

1answer

MB 2001 C320 still has battery drain issues after new battery and unplugged seat module

Here are the general instructions to find a battery parasitic drain, it is different for each problem and there is no magic bullet fix.

Instructions

Charge your battery if necessary. Dead batteries (and even weak ones) don't give accurate results on a draw test. The dome light is a good indicator of battery strength. If the light is weak, pulsating or refuses to turn on, you'll need to charge the battery.
2Shut off everything in the car. Pull the keys out of the ignition. Ensure all service lights are off, lighted compartments closed and doors shut. Open the hood, and disconnect the trouble light underneath if your vehicle has one. Wait for 30 minutes before moving on to Step 3. (This enables normal drain from interior components to finish cycling.)
3Set your battery tester to 10 amps DC. Disconnect your positive battery connection (red cable) and position it safely away from metal components. Connect the meter's positive probe to the battery's positive post while simultaneously holding the negative probe in the air; keep it away from anything metal.
4Place the negative probe on the end of the removed positive cable to complete the circuit. Yes, you're putting a negative on a positive. Yes, this is ok. If you have a severe drain, you're likely to pop a fuse or two-identifying your problem.
5Check the meter reading. A normal reading is usually under .035 amps. If you have a minor drain that causes a higher reading, you'll need to check each component.
6Remove the first fuse in the box, and check to see if the load problem is resolved. If not, replace the fuse and check the next one. Repeat the process with all fuses. If the fuses check out fine, you have a wiring problem.
7Remove the tester and reconnect the battery. Follow the hot wire to the next connection. Remove the positive cable and connect the positive probe of the tester in its place. Connect the negative probe to a metal object. Check the meter. If the drain isn't resolved, reconnect as normal and follow the hot wire to the next connection. Repeat this step at each connection point until you narrow down the problem.

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Aug 10, 2012 • 2001 Mercedes-Benz C-Class

0helpful

1answer

Hi I have an electical problem in my c240-2001...if i leave the car 2 days without driving it...the day i come to turn on the engine..it dosen;t work...out of power it is like the battery is empty...my...

Common problem on the early C-class. There are a few control modules that used to cause the battery to go dead overnight because they kept the C.A.N. system alive. The easiest ones to get at and disconnect are the seat control modules located under the driver and passenger seat. Unplug those two control modules and then see if you can start the car in a couple days. The other two are the overhead control panel or dome light assembly and the radio head unit. These were the most common control modules that got changed out in the dealers. Start there and let me know what happens.

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Jan 09, 2011 • 2001 Mercedes-Benz C-Class

0helpful

2answers

I have a short that causes battery to go down. checked fuses and #1 fuse in main fuse box is draining by battery. I need a wiring diagram to help me. can you help with this problem?

Helm.com, has factory wiring diagram manual. Have to buy it.

If you had a short, a fuse would open, and the circuit effecting your battery drain, would not be an issue.
You have a module not timing out or other electronic current drain,from a failed component.
You will find the issue,as you said, with a wiring schematic and proper trouble shooting

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Sep 03, 2010 • 1999 Ford Taurus

1helpful

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How do you change fuel pump on a 04 dodge intrepid?

hope this helps...
Pump Module—Left Side

Release the fuel pressure.
Disconnect negative battery cable.

NOTE The fuel level of the vehicle must be below 5/8 of a tank before you remove the module lock-rings. If it is above that you can spill fuel in the vehicle.
Drain partial fuel from fuel tank through the filler tube. Use a hard nylon tube, with a 30° cut on the end, to push the check valve open to drain fuel from tank.
Remove the rear lower seat cushion.
Push seat back and up to remove seat cushion.
Fold back the foam pad covering access cover for modules.
Disconnect the electrical connector from left side module.
Mark the module orientation.
Use special tool 9340 to remove left side module lock ring.
Drain fuel from left side of fuel tank. Lift module up enough to push hose into tank and drain. Do not spill fuel in interior of vehicle.
Disconnect the electrical connector for the left side fuel level card from bottom of the module top.
Disconnect the electrical connector for the right side fuel level sending card.
Lift module top half off and tip lower half on its side to drain remaining fuel from the reservoir.
Remove wire from module.
Use a screwdriver to separate the locking tabs on the level sending card.
Lift level sending card straight up and out of module.
Disconnect the electrical wiring from module.
Remove level sending card.

To install:

Install level sending card, make sure that the locking tabs are locked on the card.
Route wires in the proper location.
Install module top to module bottom.
Connect the electrical connectors for right side fuel level sending card, left side module card and fuel pump.
Install module and align marks on the module for proper orientation.
Install module lock-ring.
Use special tool #9340 to tighten left side module lock ring.
Connect the electrical connector to left side module and install plastic access cover.
Fold the foam pad covering access cover for modules back into place.
Install rear lower seat cushion
Rear lower seat cushion installed.
Fill fuel tank.
Connect negative battery cable.
Fill fuel tank. Use the scan tool to pressurize the fuel system. Check for

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Jan 28, 2010 • 2004 Dodge Intrepid

7helpful

4answers

Battery drain in MB C320

Unplug the power seats.

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May 25, 2009 • 2002 Mercedes-Benz C-Class

0helpful

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I need to find the fuse for the driver seat in a 2001 C 320 merce

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May 08, 2009 • 2002 Mercedes-Benz C-Class

2helpful

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My 2001 jaquar s-type every two weeks car won,t start new batt,nothing draining elect sys,alt ok,car will not start if you jump battery,car will start if you put jumping cables on alt and ground other to...

The S Type is similar to the Lincoln LS.
These are TSBs that address battery drain on the LS.

Partial TSB
Article No.
02-9-5

ELECTRICAL - BATTERY DRAIN DIAGNOSIS - SERVICE TIPS

Publication Date: APRIL 30, 2002
FORD: 2002 THUNDERBIRD LINCOLN: 2000-2002 LS
ISSUE: Some vehicles may exhibit excessive electrical system current draw which could result in a discharged battery and a no crank condition.
ACTION: Use the following Service Tips to monitor the vehicle electrical system for excessive battery current drain and repair as needed. Refer to the following Service Information Tips for details.
SERVICE INFORMATION Having a firm grasp on the design and normal operation of the electrical system will aid in properly diagnosing and repairing any faults with electrical components and/or circuitry. When the vehicle is at rest (ignition key turned off and removed), some amounts of battery current drain will be present since many of the modules and electronic components in the vehicle require this to sustain memory and system monitoring. The Powertrain Control Module, Antilock Brake Module, Electronic Automatic Temperature Control Module, Front Electronics Module, Rear Electronics Module, Driver Door Module, Instrument Cluster Module, Roof Opening Panel Module, Heated Seat Module, Driver Seat Module, Cell Phone Module and Vehicle Emergency Message System Module all have power supplied at all times for this purpose. Many of these modules monitor activity and communicate with each other through the Standard Corporate Protocol (SCP) Link. When the ignition key is first shut off and removed, the vehicle is exited and the doors are closed, the electrical system goes into "stand-by" mode, where the Rear Electronics Module (REM) and the Front Electronics Module (FEM) keep the System Switched Power (SSP) relays activated. After a minimum of 45 minutes, the REM and FEM will power down to prevent battery discharge. Power down mode occurs when the REM and FEM "time out" and release the ground on all 4 (four) of the SSP relays. The SSP relays are wired in a fashion in which they are either all on or all off. In other words, the SSP relays cannot be operated independent of each other. If power down does not occur, because of a system fault or errant SCP Link activity, the REM and FEM will remain energized along with the SSP relays and the other electrical devices that they provide power. The REM and FEM provide power and ground to devices such as exterior/interior lighting and many of the body modules in the vehicle. The Wiring Diagrams Manual may be referenced for additional information on the SSP relays, the REM and FEM, in Sections 13 & 59. Once the REM and FEM enter power down mode they will not energize the SSP relays until they are commanded to "wake up" by one or more of the following commands:

Key Fob Activity (Any Command)
Door Ajar (Any Door)
Luggage Compartment Ajar Switch
Drivers Power Seat Switch
Power Tilt/Telescopic Steering Column
Headlamps/Park Lamps On
Key In Ignition
Key On Ignition
Anti-Theft Hood Switch
Brake Pedal Position Switch
Memory Seat Switch

BATTERY DRAIN DIAGNOSIS -------------------------------------------

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May 03, 2009 • 2000 Jaguar S-Type

0helpful

1answer

C320 starting problem

Hello,

I had the same problem with mine. Disconnect the power seat moduale underneath the seats. Recharge the battery and shouldn't happen again. Providing the battery hasn't worn down past the charging point. Worst case you will have to get a new battery. If you google C320 battery drains you will see hundreds of other peoples posts.

Good Luck

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Oct 26, 2008 • 2001 Mercedes-Benz C-Class

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Battery still drains. Seat modules unplugged already