Circuit Description
WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
The stoplight signal is used to detect when brakes have been applied. ECM uses this signal to control fuel cut-off engine speed. DTC P1520 is set if stoplight switch does not turn off when vehicle is being driven. Possible causes are:
- Short in stoplight switch signal circuit.
- Faulty stoplight switch.
- Faulty ECM.