Button Switch Circuit Fault

Your vehicle's computer is telling you that there's a problem with the wiring or connection of a button switch, usually on the dashboard or controls.

The control module expects a specific resistance value from the button switch circuit but detects an open circuit or a voltage that is out of range—typically around 5V when the switch is engaged.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Inspect the wiring and connectors for damage or corrosion—look for frayed wires or a loose connection. Decision Point: If damaged, repair or replace the wiring/connector; if not, move to step 2.
2. 2Use a multimeter to test the resistance of the button switch. When not pressed, the resistance should be high; when pressed, it should be low (under 1 ohm). Decision Point: If resistance is out of specification, replace the button switch; if within specs, move to step 3.
3. 3Check the voltage at the control module connector while the switch is pressed. You should see around 5V. Decision Point: If voltage is absent or incorrect, trace back to the source for issues; if correct, the control module may be faulty.

• Wiring damage or corrosion near the switch
• Bad button switch
• Poor connector connection or dirt in the connector

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