LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 1992 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Transmission >> Component Check Charts >> Brake Signal Circuit Check >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Brake Signal Circuit Check: Notes

The normally closed brake switch supplies a 12-volt signal on circuit No. 420 to the PCM/TCM. The signal voltage is removed when brakes are applied. An incorrect brake signal may affect TCC operation.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. This test checks for voltage at brake switch.
  2. This test simulates closed brake switch (brakes off).
  3. This test checks circuit No. 420 from brake switch to PCM/TCM.
  4. This test opens circuit No. 420 and simulates condition of brakes being applied.
scientia non olet · About LEMON Manuals