Circuit Description
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control.
A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP-.
When the brake is depressed, battery positive voltage normally applies through the STOP fuse and stop light switch to terminal STP- of the ECM, and the ECM turns the cruise control off.
If the harness connected to terminal STP- has an open circuit, terminal STP- will have battery voltage and the cruise control will be turned off.
DTC CONDITION DETECTION CHART
| DTC No. | Detection Item | Trouble Area |
|---|---|---|
| 52 | Stop light switch circuit. |
|