81 - Brake Switch Circuit

Test 1:

Test 2-6:

Symptom
BRAKE SWITCH CIRCUIT - 81

When Monitored
Ignition on.

Set Condition
Continuous brake applied signal after ignition turn-on and remaining with sensed speed above 37.5 MPH (RWAL) or 15 MPH (ABS) for over 10 seconds and/or ABS active for at least a second with brake switch released and never sensed brake applied since power up.

POSSIBLE CAUSES
- VERIFY THE CONCERN
- CAB BRAKE STATUS
- BRAKE SWITCH OPEN
- BRAKE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
- BRAKE SWITCH SENSE CIRCUIT OPEN
- BRAKE SWITCH GROUND CIRCUIT OPEN
- CAB - INTERNAL CONCERN