Symptom:
BRAKE SWITCH CIRCUIT
Wh e n Mo n i to re d a n d S e t Co n d it i o n :
BRAKE SWITCH CIRCUIT
Wh en Mon it or ed: Ign it ion On - Con t inu ou sly
Set Con dition : Wh en t h e br a ke lam p swit ch a nd br ake swit ch ou t pu t s a r e bot h open or
sh or t ed.
POSSIBLE CAUSES
IN TE RMITTE NT BRAKE SWITCH CIRCU IT DTC
BRAKE LAMP SWITCH STATUS
BRAKE SWITCH STATUS
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
OUTP UT CIRCUIT SH ORT TO VOLTAGE
OU TP UT CI RCUI T S HORT TO GROU N D
OU TP UT CI RCUI T OP E N
BRAKE SWITCH OUTP UT CIRCUIT SH ORT TO BRAKE LAMP SWITCH OUTP UT CIRCUIT
BRAKE LAMP SWITCH
BRAKE SWITCH
ANTI-LOCK BRAKE CONTROLLE R
TE S T ACTION AP PLICAB ILITY
1 NOTE: This DTC will set if the Brake Switch, the Brake Lamp Switch, or
both sw itche s are inoperative. It will be necessary to verify the functional-
ity of each sw itch.
NOTE: If the Brake Switch and the Brake Lamp Switch are inoperative, it
will be necessary to diagnose BOTH circuits.
Tur n th e ign it ion off.
Tur n th e ign it ion on .
Wit h t he DRBIII" in In put s/Ou t pu t s, m on it or t h e Br a k e La m p Swit ch st a t e wh ile
pressing a nd r eleasing th e brake pedal.
Does t h e DRBIII" displa y ch an ge fr om OP E N to CLOSE D a s t he br a ke peda l is
pressed a nd r eleased?
All
Ye s → Go To 2
No → Go To 5
17
BRAK ES (CAB)
To Next Page