Brake lights and turn signals not working properly

Good afternoon,

I attached a diagram for you of the light system. The power for the lights comes from the body control module. Signals are sent to the module from the brake light switch and the turn signal switch and once those signals are received, it will send power to the correct lamps.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Check the stoplight relay for power. I highlighted the relay in the diagram for you to test for power. The signal wire comes from the body control module and grounds the control side of the relay for the brake lights to come on.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I attached the connector for the body control module with the pins for the output. Check for voltage at the connector.

Roy