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My 2008 Lexus LS 600h was misbehaving. The adaptive cruise control was giving me problems. Every time I turned it on it would immediately give me the error message "Check Cruise Control Have your vehicle checked by a dealer Have your vehicle checked by a dealer" and disable the ACC.
Scanning for codes I got C1A05, C1A40, and B2090.

If you're experiencing error codes C1A05, C1A40, and/or B2090 on your Lexus or Toyota car, it's likely that the issue is related to the brake light switch. The brake light switch, also known as the stop lamp switch, is a crucial component that sends signals to the vehicle's computer when the brake pedal is depressed. In this video, I will show you how to replace the faulty brake light switch on a Lexus LS600h with a new one, using the correct part number for that car (84340-30110), to fix these error codes. The brake light switch is cheap at around 30$ and very easy to replace by anybody without the need for specialized tools.

The process of replacing the brake light switch is relatively straightforward. First, locate the switch on your car, which is typically located near the brake pedal. Once you've located the switch, disconnect the electrical connector from the switch. After that, remove the switch from the brake pedal assembly.

Next, install the new brake light switch. Make sure that you have the correct part before installing it. Reattach the electrical connector to the new switch and test the switch to ensure that the error codes have been cleared.

Additionally, I also wanted to share that I recently had an issue with my car's heating system. It would only heat intermittently and I found out that it was caused by low coolant levels. I managed to fix it by adding half a liter of engine coolant for just 4$. It's always worth checking the levels of your coolant and other fluids before taking your car to the mechanic, as it could save you a lot of money.

00:00 Previously
00:31 Introduction / problem description
03:22 Bodge wires discovery
03:56 Brake light switch replacement
06:17 Test drive
12:28 Intermittent heating fix
14:46 Interaction reminder & end