Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSATURN2002SL1 L4-1.9L SOHC VIN 8REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONCOMPONENT DESCRIPTIONSSTOP LAMP SWITCH
2002 Saturn SL1 L4-1.9L SOHC VIN 8
Stop Lamp Switch
2002 Saturn SL1 L4-1.9L SOHC VIN 8SECTION Stop Lamp Switch
The stop lamp switch is located under the dashboard touching the brake pedal. The stop lamp switch is used to turn On the stop lamps and to serve as an input to the PCM and cruise control module (if equipped). The stop lamp switch has two internal independent switches; one is used for the stop lamps and the other for the PCM/cruise control module inputs. The switch for the PCM/cruise control module is normally closed (brake pedal released, plunger depressed) and the switch for the stop lamps is normally open (brake pedal released, plunger depressed). Ignition voltage is supplied to the PCM and cruise control module through the stop lamp switch whenever the ignition is turned On and the brake pedal is released. When the brake pedal is depressed, the PCM/cruise control module inputs go low. The stop lamp switch is also used by the PCM as an input for transaxle downshifting and TCC operation.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.