TM 9-2320-387-24-l
INSTRUMENTS CIRCUIT
.
DIAGNOSTIC FLOWCHART
KNOWN INFO
WIRING OK
POSSIBLE PROBLEMS
PROTECTIVE CONTROL
BOX
BRAKE WARNING
PRESSURE SWlTCH
PARKING BRAKE SWITCH
KNOWN INFO
WIRING OK
PCB OK
BRAKE WARNING VALVE
SWlTCH OK
POSSIBLE PROBLEMS
PARKING BRAKE SWITCH
KNOWN INFO
PROTECTIVE CONTROL
BOX OK
WIRING OK
POSSIBLE PROBLEMS
BRAKE WARNING
PRESSURE SWITCH
PARKING BRAKE SWITCH
ZONNECT PCB BODY HARNESS.
IOES THE LIGHT STAY OFF?
I TESTOPTIONS
TEST OPTfONS
VISUAL
CONNECT PARKING BRAKE
SWITCH. MAKE SURE THE
PARKING BRAKE IS DISENGAGED.
DOES THE LIGHT STAY OFF?
VISUAL
REASON FOR QUESTlON
When the PCB is connected,
the light should not come on.
If it does, the PCB is faulty.
REASON FOR QUESTION
The light will only come on
when the parking brake switch
is connected if the parking
brake switch has a problem.
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I 1
REMOVE JUMPER WIRE. CONNECT
BRAKE WARNING PRESSURE
SWITCH. DOES LIGHT STAY OFF?
rEST OPTlONS
VISUAL
REASON FOR QUESTION
PROPORTIONING
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