Brake Light Switch
Brake light switch is now a hall-effect transmitter with three connections. The first connection is power, supplied from KL R, with the second being ground. The third connection is the signal wire to the LCM.
The electronic brake light switch eliminates the need for the brake test switch. If the brake switch or it's circuits fail, the brake lights will be permanently on from KL R.
The signal wire from the electronic brake light switch is active when the brakes are applied sending a 12 volt signal to the LCM. When the brake light switch is in the rest position, there is a small digital signal of approximately 100 mv present on the signal line. If this signal is interrupted, the LCM will switch the brakes lights on as a safety measure.