The P0565 code on your 2022 Lexus RX indicates a low voltage condition in the cruise control multi-function input A circuit. This electrical code points to a specific circuit issue within the cruise control switch system.
Low Circuit Analysis
A low voltage reading from the cruise control input indicates a short to ground somewhere in the circuit. The ECM expects a specific voltage range when reading switch inputs; readings below minimum suggest the signal is being pulled to ground.
RX Cruise Control System
The 2022 Lexus RX features standard adaptive cruise control with steering wheel-mounted controls. The 'Input A' circuit may refer to a specific switch function within the multi-function assembly. Circuit designations vary by manufacturer.
Causes of Low Input
Internal switch short causing constant low signal. Wiring shorted to ground due to insulation damage. Corroded connector creating ground path. Clock spring damage affecting the specific circuit. Water intrusion in steering wheel switch area.
Diagnostic Steps
Use Lexus Techstream to monitor cruise control input signals. Identify which function corresponds to 'Input A'. Check voltage at the switch connector. Test for shorts to ground in the wiring. Inspect the clock spring for damage. Check for moisture in the steering wheel switch area.