Mercedes GL ML R SAM W164 X166 Control Unit Rear Module OEM 1649005401 A1649005101 Brand New

$1,195.00
1 in stock.
SKU
1649005401

Signal Acquisition And Actuation Module (SAM) for Mercedes-Benz ML-Class W164, R-Class W251 or GL-Class X164.

Mercedes GL ML R SAM W164 X166 Control Unit Rear Module OEM 1649005401 Genuine Brand New

Fitting note:

This module must be coded with Mercedes Star Diagnostics after installation.

SAM stands for Signal Acquisition Module. A SAM module (also called Signal Actuation Module) receives data from sensors, switches, and controllers, and can send data, actuate (activate) components and monitor systems. Mercedes-Benz has been using SAM modules since the mid-90s.

Symptoms of a defective Mercedes SAM unit

This is a list of a few possible SAM related problems. All systems on a Mercedes-Benz are controlled via CAN  Bus and SAM units, and any issue that you may experience could very well be due to a defective SAM unit.  SAM units don’t frequently fail unless there is water intrusion or other problems.

Here are a few problems caused by a bad SAM unit:

  • Fuel Level / Gauge not working – The sending unit installed in the gas tank records the fuel level. In cars without CAN / SAM, the signal is sent directly to the instrument cluster via two wires. On Mercedes-Benz, the signal has to be sent to the rear SAM since it is the closest unit in the Controller Are Network. From here the fuel level data can be sent to the instrument cluster or the engine control unit for computing remaining distance based on fuel level.
  • Lights not working – We have seen many Mercedes-Benz where one or a few lights don’t work. It can be that the left or right low beams, fog lights or turn signals may not work. You should always avoid splicing wires to get power for aftermarket HID lights, alarm or connecting a trailer hitch.
  • Fuse Keeps Blowing – If you have a fuse that keeps on blowing, it is possible that the SAM module is defective and needs to be replaced.
  • Poor key fob / keyless entry range – The key lock and unlock signal for the doors is transmitted via the rear antenna. The antenna is connected to the rear SAM module and a short in the wiring can cause damage to the SAM unit. If this is your dilemma, you may notice a blown antenna fuse.  Especially if you replace the fuse and it keeps on blowing. Don’t use a higher ampere rating fuse to try to fix this problem.
  • Battery Drain –  A defective SAM module can cause battery drain when a Mercedes-Benz is parked overnight or for several days. Other possibilities should be eliminated such as a defective audio gateway unit or a bad power seat motor.
  • Taillights staying on – If one or both of your tail lights stay on all the time it is possible that your rear SAM unit is defective. Other symptoms of a bad rear SAM include doors showing open all time, even when the doors are closed.
  • Center Dashboard Buttons don’t work – Currently, we are working on an S-Class in which all the center buttons ( hazard light, head restraint, AIRMatic switch etc.) don’t work. In this case, we are not getting any communication with the module which most likely is an issue with the SAM unit.
  • Mercedes Blowing Only Cold Air – This problem could be caused by a defective front SAM module. Before you replace the front SAM module, also check (changeover/duo valve) water valve first.

SAM Module Explained

Think of  SAM as the router in your home. All your devices network printers, phones, computers (switches, window motors, sensors, etc) communicate with each other via your router. If you hit print on your PC, the data (signal) gets sends to your network printer via the wireless router (SAM unit). You may also hear the term CAN Bus which stands for Controller Area Network. Think of  CAN Bus as that ethernet cables and wi-fi that make up your home network communication possible.

Not all cars have SAM & Controller Area Network. That would be the same as connecting your printer directly to your computer via a USB cable.

Mercedes SAM Module Location, Purpose

Where is SAM module located on a Mercedes-Benz? The location of the SAM module depends on the Mercedes-Benz chassis. Most SAM modules are usually installed by the fuse box. Mercedes-Benz cars may have a rear and front SAM module.

  • Left SAM in located in engine compartment. It handles left front lights, side light, a rear air outlet, illumination, glove compartment lock illumination, light switch, steering column adjustment motor group, ESP, SPS and BAS control, AIRMATIC with ADS control unit, ABC control unit. Left SAM also receives signal data from the left front brake pad contact sensor, A/C pressure sensor, refrigerant temperature sensor, brake fluid indicator,  outside temperature sensor and parking brake indicator switch. Low beam is handled left SAM.
  • Right SAM is in the engine bay. Handels right, front lights and the side light, center console storage, lights in the glove box and eyeglass compartment, ashtray and footwell. It also handles pumping for the windshield washer nozzle and pumping water for the Headlamp Cleaning System, radiator fan for coolant, the fan for transmission oil cooler, and the circulation pump for the heating system delivery unit. Monitors right front brake pad wear sensor, coolant level indicator with windshield washer fluid level indicator and Anti-Theft Alarm, hood switch. Low beam communication is handled by the right SAM,
  • Rear SAM is typically under the right rear seat. Handels communication with trailer recognition control unit, ESP, SPS and BAS. It communicates with the overhead control panel. It controls rear lights, closing the trunk and fasten seat belts indications; fuel tank level sending unit, a tilt sensor Anti-Theft Alarm inclination sensor, door contact switches, and the rear brakes wear sensor.

Top 4 Problems that cause SAM failure

  • Corrosion –  It is possible that the SAM control module may have gotten wet, corroded and eventually failed. Typically this is caused because repair is performed in near the SAM control unit. If the SAM modules are not closed and sealed, properly they will eventually corrode. If a SAM module fails due to corrosion, at first you may notice that electrical problems are intermittent.
  • Excessive current draw – SAM control units don’t fail often. Other than physical damage or corrosion the next most likely cause to make your SAM unit fail is an excessive current draw. If you’ve done modifications to your Mercedes-Benz or have a module that is drawing too much current that can damage your SAM unit.
  • Broken wires – Broken wires or shorts can cause your SAM module to fail due to excessive current draw.
  • Incorrect SAM coding – If you just had your MB serviced and now you have a different problem it is possible that there is a programming issue. During a repair a technician may have reprogramed a new sensor but they didn’t complete all the needed programming. If this is your situation, t is important to read all fault codes before you start doing any troubleshooting on your Mercedes-Benz.
  • The #1 problem that causes SAM units to fail is water intrusion (corrosion). 

    Don’t be surpprised if you replace your SAM module and a few months later it fails again. Try to find the cause of the problem if you don’t want for the problem to reapear. 

Mercedes Rear Sam Module W164 A1649005401 - Sam Control Unit

Mercedes GL ML R SAM W164 X166 Control Unit Rear Module OEM 1649005401 Brand New

Signal Acquisition And Actuation Module (SAM) for Mercedes-Benz ML-Class W164, R-Class W251 or GL-Class X164.

This unit controls the operation of various electrical systems for your vehicle body.

This version of the SAM is required for use if your are installing a trailer hitch on your Mercedes-Benz. This is the latest version of the SAM available from Mercedes-Benz.

Module specifics:

  • HW: A 164 545 72 16
  • SW: A 164 902 57 00
  • Delphi Part no. 28291981

Scope of delivery:

  • 1x Mercedes-Benz SAM Rear Module A 164 900 54 01

 

More Information
OEM Part Number A1649005401 A1649005101
Manufacturer Mercedes-Benz
Condition Brand new
Install time (h) 2
Country of Manufacture United States
Rack 1
Shelf 3
Shelf side Front
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You're reviewing:Mercedes GL ML R SAM W164 X166 Control Unit Rear Module OEM 1649005401 A1649005101 Brand New

This Fits:

Make Model Year
Mercedes-BenzM-Class2004
Mercedes-BenzM-Class2005
Mercedes-BenzM-Class2006
Mercedes-BenzM-Class2007
Mercedes-BenzM-Class2008
Mercedes-BenzM-Class2009
Mercedes-BenzM-Class2010

Note:

This module must be coded with Mercedes Star Diagnostics after installation.

SAM stands for Signal Acquisition Module. A SAM module (also called Signal Actuation Module) receives data from sensors, switches, and controllers, and can send data, actuate (activate) components and monitor systems. Mercedes-Benz has been using SAM modules since the mid-90s.

Symptoms of a defective Mercedes SAM unit

This is a list of a few possible SAM related problems. All systems on a Mercedes-Benz are controlled via CAN  Bus and SAM units, and any issue that you may experience could very well be due to a defective SAM unit.  SAM units don’t frequently fail unless there is water intrusion or other problems.

Here are a few problems caused by a bad SAM unit:

  • Fuel Level / Gauge not working – The sending unit installed in the gas tank records the fuel level. In cars without CAN / SAM, the signal is sent directly to the instrument cluster via two wires. On Mercedes-Benz, the signal has to be sent to the rear SAM since it is the closest unit in the Controller Are Network. From here the fuel level data can be sent to the instrument cluster or the engine control unit for computing remaining distance based on fuel level.
  • Lights not working – We have seen many Mercedes-Benz where one or a few lights don’t work. It can be that the left or right low beams, fog lights or turn signals may not work. You should always avoid splicing wires to get power for aftermarket HID lights, alarm or connecting a trailer hitch.
  • Fuse Keeps Blowing – If you have a fuse that keeps on blowing, it is possible that the SAM module is defective and needs to be replaced.
  • Poor key fob / keyless entry range – The key lock and unlock signal for the doors is transmitted via the rear antenna. The antenna is connected to the rear SAM module and a short in the wiring can cause damage to the SAM unit. If this is your dilemma, you may notice a blown antenna fuse.  Especially if you replace the fuse and it keeps on blowing. Don’t use a higher ampere rating fuse to try to fix this problem.
  • Battery Drain –  A defective SAM module can cause battery drain when a Mercedes-Benz is parked overnight or for several days. Other possibilities should be eliminated such as a defective audio gateway unit or a bad power seat motor.
  • Taillights staying on – If one or both of your tail lights stay on all the time it is possible that your rear SAM unit is defective. Other symptoms of a bad rear SAM include doors showing open all time, even when the doors are closed.
  • Center Dashboard Buttons don’t work – Currently, we are working on an S-Class in which all the center buttons ( hazard light, head restraint, AIRMatic switch etc.) don’t work. In this case, we are not getting any communication with the module which most likely is an issue with the SAM unit.
  • Mercedes Blowing Only Cold Air – This problem could be caused by a defective front SAM module. Before you replace the front SAM module, also check (changeover/duo valve) water valve first.

SAM Module Explained

Think of  SAM as the router in your home. All your devices network printers, phones, computers (switches, window motors, sensors, etc) communicate with each other via your router. If you hit print on your PC, the data (signal) gets sends to your network printer via the wireless router (SAM unit). You may also hear the term CAN Bus which stands for Controller Area Network. Think of  CAN Bus as that ethernet cables and wi-fi that make up your home network communication possible.

Not all cars have SAM & Controller Area Network. That would be the same as connecting your printer directly to your computer via a USB cable.

Mercedes SAM Module Location, Purpose

Where is SAM module located on a Mercedes-Benz? The location of the SAM module depends on the Mercedes-Benz chassis. Most SAM modules are usually installed by the fuse box. Mercedes-Benz cars may have a rear and front SAM module.

  • Left SAM in located in engine compartment. It handles left front lights, side light, a rear air outlet, illumination, glove compartment lock illumination, light switch, steering column adjustment motor group, ESP, SPS and BAS control, AIRMATIC with ADS control unit, ABC control unit. Left SAM also receives signal data from the left front brake pad contact sensor, A/C pressure sensor, refrigerant temperature sensor, brake fluid indicator,  outside temperature sensor and parking brake indicator switch. Low beam is handled left SAM.
  • Right SAM is in the engine bay. Handels right, front lights and the side light, center console storage, lights in the glove box and eyeglass compartment, ashtray and footwell. It also handles pumping for the windshield washer nozzle and pumping water for the Headlamp Cleaning System, radiator fan for coolant, the fan for transmission oil cooler, and the circulation pump for the heating system delivery unit. Monitors right front brake pad wear sensor, coolant level indicator with windshield washer fluid level indicator and Anti-Theft Alarm, hood switch. Low beam communication is handled by the right SAM,
  • Rear SAM is typically under the right rear seat. Handels communication with trailer recognition control unit, ESP, SPS and BAS. It communicates with the overhead control panel. It controls rear lights, closing the trunk and fasten seat belts indications; fuel tank level sending unit, a tilt sensor Anti-Theft Alarm inclination sensor, door contact switches, and the rear brakes wear sensor.

Top 4 Problems that cause SAM failure

  • Corrosion –  It is possible that the SAM control module may have gotten wet, corroded and eventually failed. Typically this is caused because repair is performed in near the SAM control unit. If the SAM modules are not closed and sealed, properly they will eventually corrode. If a SAM module fails due to corrosion, at first you may notice that electrical problems are intermittent.
  • Excessive current draw – SAM control units don’t fail often. Other than physical damage or corrosion the next most likely cause to make your SAM unit fail is an excessive current draw. If you’ve done modifications to your Mercedes-Benz or have a module that is drawing too much current that can damage your SAM unit.
  • Broken wires – Broken wires or shorts can cause your SAM module to fail due to excessive current draw.
  • Incorrect SAM coding – If you just had your MB serviced and now you have a different problem it is possible that there is a programming issue. During a repair a technician may have reprogramed a new sensor but they didn’t complete all the needed programming. If this is your situation, t is important to read all fault codes before you start doing any troubleshooting on your Mercedes-Benz.
  • The #1 problem that causes SAM units to fail is water intrusion (corrosion). 

    Don’t be surpprised if you replace your SAM module and a few months later it fails again. Try to find the cause of the problem if you don’t want for the problem to reapear. 

 

WARNING: It must be ensured that all the requirements of the vehicle manufacturer for changes to and retro-fitting on the vehicle and / or cooling system for the operation with a trailer are carried out.
NOTE: We strongly recommend profesional installation for our wiring kits. Only qualified companies may install the electrical system for the trailer hitch. Improper assembly may result in a serious accident hazard!
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