2004 CLK 500 Convertible W209 Parking Brake Indicator and Alarm Activated

Tim_Farrell

The parking brake works well, the parking light switch is new, however the parking brake light and dashboard continue to beep and flash red. I am uncertain about what other aspects to examine. Thank you.

1480midge

Is the parking brake disengaging completely?

Occasionally engaging and disengaging the parking brake vigorously around 10 times may enhance its functionality.
Exercise caution while using the release handle, as excessive force may result in breakage.

Tim_Farrell

Thank you for your assistance. Yes, the release is complete, and I have confirmed that the switch is disengaged; however, this problem is quite frustrating. Are you aware whether the car's computer may be related to the problem? The vehicle exhibits elevated energy use, depleting the battery within a few days.

1480midge

If the brake is completely removed and the switch is not activated, there should be no warning light on the dashboard.

It is uncertain if the computer is a contributing element; nevertheless, you may try unplugging the battery for several hours and then reconnecting it to see if there is any effect.

A depleted battery may also be a contributing cause; thus, it is essential to address the battery drain issue and ensure that the existing battery is robust and in good condition.

Tim_Farrell

Indeed, all of your recommendations have been implemented. I suspected that there may be an additional component of the system I overlooked, or that the vehicle's computer was malfunctioning. Thank you.

3798j

Inspect the wiring for a switch malfunction (diagram included) at the switch and front SAM. If the switch is operational (verify both the grounding and power supply to the switch), then the issue may lie with the front SAM. At that point, it would be advisable to use STAR SDS (or another reputable Mercedes scanner) to examine the vehicle for live data from the switch. If it is satisfactory, then verify the live data about the warning light.

It is observed that there are two inputs to the SAM for the parking brake switch.

Tim_Farrell

Thank you for your prompt response and the comprehensive information provided. I shall examine the SAM.