G 3500 1 Ton Van V8-379 6.2L DSL VIN J FI (1992)
Brake Signal Diagnostic Chart
Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks for voltage at brake switch.
2. This test simulates brake switch closed or brakes "OFF".
3. Checks CKT 420 from brake switch to PCM/TCM.
