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 MANUALSCHEVROLET1992LUMINA APV V6-3800 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBRAKE SIGNALDESCRIPTION AND OPERATION
1992 Chevrolet Lumina APV V6-3800 3.8L
Brake Signal: Description and Operation
1992 Chevrolet Lumina APV V6-3800 3.8LSECTION Description and Operation
Brake Switch Input (TCC):
BRAKE SWITCH (TCC)
Brake Switch Circuit (Cruise Control Brake Input):
BRAKE SWITCH (CRUISE BRAKE)
PURPOSE
The brake switch signals the PCM to turn "OFF" the [1][2]torque converter clutch and/or the cruise control when the brakes are applied.
OPERATION
The brake switch actually contains two switches. Both portions of the switch are normally closed and open when the brakes are applied. This interrupts power to the "cruise brake" input terminal of the PCM, and interrupts the power supply to the TCC solenoid inside the transaxle.
RENDER: 1.0x
NO RELATED
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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.