G 3500 1 Ton Van V8-379 6.2L DSL VIN J FI (1992)
Brake Signal: Testing and Inspection
Brake Signal Circuit
Circuit Description:
The normally closed brake switch supplies a 12 volt signal on CKT 420 to the PCM/TCM. The signal voltage is removed when the brakes are
applied. An incorrect brake signal may affect TCC operation.
