REASON FOR QUESTION
1. STE/ICE-R TEST 91
(PAGE 2-752)
2. MULTIMETER
If the light comes on when
brake warning pressure switch
is connected, the brake
warning pressure switch is the
problem.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
NO
YES
NO
YES
2-344 Change 1
CONNECT PARKING BRAKE
SWITCH. MAKE SURE THE
PARKING BRAKE IS DISENGAGED.
DOES THE LIGHT STAY OFF?
REMOVE JUMPER WIRE. CONNECT
BRAKE WARNING PRESSURE
SWITCH. DOES LIGHT STAY OFF?
WIRING OK
PCB/DISTRIBUTION BOX
OK
BRAKE WARNING VALVE
SWITCH OK
REPLACE
PROPORTIONING
VALVE
REPLACE
PARKING BRAKE
SWITCH
END OF TEST
FROM 3,
Page 2-342
4
5
VISUAL
The light will only come on
when the parking brake switch
is connected. If the parking
brake switch has a problem.
PARKING BRAKE SWITCH
INSTRUMENTS CIRCUIT
DIAGNOSTIC FLOWCHART
TM 9-2320-280-20-1
KNOWN INFO
POSSIBLE PROBLEMS
PCB/DISTRIBUTION BOX OK
WIRING OK
BRAKE WARNING
PRESSURE SWITCH
PARKING BRAKE SWITCH
TEST OPTIONS
