Code Definition

P1565 — Cruise Control Main Switch Circuit

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Toyota

About P1565

P1565 is a manufacturer-specific powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1565 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1565 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This fault code sets when the Engine Control Module (ECM) detects a malfunction in the cruise control main switch circuit. The cruise control main switch is usually a multifunction switch mounted on the steering wheel or column that encodes the ON, OFF, SET, RESUME, and CANCEL positions, commonly through a resistor ladder that produces a distinct voltage for each button on a shared signal wire. The ECM reads these voltages to know which function the driver has selected so it can engage, set, resume, or cancel cruise control. If the signal voltage is out of the expected range, stuck in one stat...

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