In 2006, the cls500 had electrical issues with its lights, alarm, key fob, blinkers, and trunk.

[depofly]

Greetings, gentlemen.

I am experiencing an issue with my 2006 CLS500.
Yesterday, while arriving at work, I turned off my vehicle and its lights. As I exited the car, I saw that the tail light located at the bottom right side was not turning off. Upon reentering the vehicle, I proceeded to start the ignition. Subsequently, a warning appeared on the dashboard indicating a "Display Malfunction" and advising me to seek professional assistance. I toggled the light switch, but the light remained on. To prevent my battery from dying, I removed the carpet and disconnected the right tail light. During the night, I saw intermittent flashing and blinking of the left bottom tail light. After finishing my job in the morning, I attempted to use the fob to open the vehicle, but unfortunately, the fob was malfunctioning. Upon pressing the buttons, the little red light on the fob illuminates, nevertheless the vehicle remains unresponsive. Fortunately, I had the foresight to leave it unlocked. Subsequently, I attempted to access the trunk by pressing the inside button, using the fob, and even by manually lifting the handle upwards, but regrettably, it remained unresponsive. To open the trunk, I had to remove the actual key from the fob, place it into the keyhole, and then pull the latch. Do you have any insights about the current situation? Kindly inform me.

In addition, I would like to inform you that the blinkers are now functioning properly.

[AmericaMonster]

Although it may not be the cause, this is a rather simple do-it-yourself task. Typically, it is located beneath a metal cover positioned behind the LH wheelarch liner. In the case of a left-hand drive automobile, it may be on the RH side. The device lacks a fuse, and disconnecting the battery will not resolve the issue, since it operates on its own internal batteries, which are often the source of the problem at this stage of its lifespan.

Although it is uncertain if this is the cause of the problem, I am hopeful that it is, since it can be easily resolved.

Best wishes for success 👍

[depofly]

Assistance required?
Regarding the prior statement, I am not familiar with the topic you are discussing. What is the purpose of the alarm sounder?

[Mindumer]

The siren is activated by the alarm and produces a loud noise.

The device operates on electricity and has the ability to cause a power outage or malfunction in the system.

While it is unlikely to be the main problem, it is worth considering as a potential starting point for investigation.

[depofly]

There is no alert or siren sounding.

[depofly]

I have obtained all of these codes. The trunk cannot be opened using the remote, the blinkers are not functioning, the right tail light is not working, the left tail parking light remains on even when the lights are off, the windows no longer automatically roll down somewhat when the doors are opened, and there is no rear defroster. There is a sense of interconnectedness in everything. Electrical problem?

[depofly]

Assistance in any kind would be very appreciated.

[engrol]

Have you performed the basic diagnostic steps, such as verifying the battery voltage and assessing the output of the alternator?

[LimeLing]

Are there any indications of water seepage in the trunk area?

[depofly]

I have inspected the battery and confirmed its satisfactory condition. Additionally, I have seen a little amount of wetness in the boot region and identified some exposed wires.

[Jollyno]

The most probable cause is a defective rear SAM unit.

The flashing signs are likely correlated, but it is possible that there is a malfunctioning alarm siren.

[depofly]

We successfully replaced the SAM module, resolving the issues with the rear light, trunk, alarm, blinkers, windows, and defrosters. Upon inspection, we discovered rust and moisture within the SAM.

[Darthilli]

Well done 👍

However, it is important not to underestimate the alarm unit's significance while investigating electrical malfunctions. No, the automobile does not emit sound. However, it has the capability to transfer electric current back into the vehicle via its own batteries, which may result in various abnormal malfunctions. During my time with a 2006 W203 C class owned by a cousin, I saw that the danger lights would spontaneously begin flashing at any given moment, whether it was day or night.

After disconnecting it, the faults ceased to exist.

[LimeLing]

As I previously said, it is a frequently encountered issue. Now let's proceed with locating the source of the water leak. 👍