Component Tests

Tests 1 - 3:

Tests 4 - 8:

Test 9:

SYMPTOM
BRAKE SWITCH SENSE STATUS DOES NOT CHANGE ON DRB

POSSIBLE CAUSES
- DRB III does not show brake SW pressed or released
- Fused B(+) circuit open
- Brake lamp switch ground circuit open
- Brake switch (sense CKT)
- Brake lamp switch sense circuit open
- Brake lamp switch sense circuit short to ground
- Brake lamp switch output less than 10.0 volts
- S/C power supply circuit below 10 volts at brake switch CONN
- Powertrain control module (brake sense)