TE S T ACTION AP PLICAB ILITY
6 Tur n th e ign it ion off.
Discon n ect t he a ppr opr ia te br a ke swit ch ha r n ess con n ector.
Tur n th e ign it ion on .
Usin g a 12-volt t est ligh t con n ect ed t o gr oun d, check t h e F u sed Ign it ion Swit ch
Ou t pu t cir cuit at t h e ha r n ess con n ect or.
NOTE: Th e t e s t lig h t m u s t illu m in a t e b rig h tly. Co m p are th e brig h tn e ss to
th a t of a dire c t co n n e cti o n to th e ba tte ry.
Is th e t est light illu mina ted and bright ?
All
Ye s → Go To 7
No → Repa ir th e F u sed Ign it ion Swit ch Ou t pu t cir cu it for an open.
Per for m ABS VE RIF ICATION TE ST - VER 1.
7 Tur n th e ign it ion off.
Discon n ect t he CAB ha r n ess con n ect or.
Discon n ect t he a ppr opr ia te br a ke swit ch ha r n ess con n ector.
Tur n th e ign it ion on .
Mea su r e th e volt a ge of th e ou tpu t cir cu it at t h e br a ke swit ch h a r n ess con n ect or.
NOTE: Measurement is taken at the Brake Switch Output circuit or the
Brake Lamp Output circuit as determined by the previously performed
switch test.
Is t h er e an y volt a ge pr esen t ?
All
Ye s → Repa ir t h e a ffect ed cir cu it for a sh ort t o volt a ge.
Per for m ABS VE RIF ICATION TE ST - VER 1.
No → Go To 8
8 Tur n th e ign it ion off.
Discon n ect t he CAB ha r n ess con n ect or.
Discon n ect t he a ppr opr ia te br a ke swit ch ha r n ess con n ector.
Mea su r e t he r esist an ce bet ween grou n d an d swit ch ou t pu t cir cu it at th e swit ch
conn ect or.
NOTE: Measurement is taken at the Brake Switch Output circuit or the
Brake Lamp Output circuit as determined by the previously performed
switch test.
Is t h e resista n ce below 5.0 ohm s?
All
Ye s → Repa ir t h e a ffect ed cir cu it for a sh ort t o gr ou n d.
Per for m ABS VE RIF ICATION TE ST - VER 1.
No → Go To 9
9 Tur n th e ign it ion off.
Discon n ect t he CAB ha r n ess con n ect or.
Discon n ect t he a ppr opr ia te br a ke swit ch ha r n ess con n ector.
Mea su r e t h e r esist a n ce of t h e out pu t cir cu it bet ween t h e swit ch h a r n ess conn ect or
an d t h e CAB h a r ness con n ect or.
NOTE: Measurement is taken at the Brake Switch Output circuit or the
Brake Lamp Output circuit as determined by the previously performed
switch test.
Is t h e resista n ce a bove 5.0 ohm s?
All
Ye s → Repa ir t h e a ffect ed cir cu it for a n open.
Per for m ABS VE RIF ICATION TE ST - VER 1.
No → Go To 10
19
BRAK ES (CAB)
BRAKE SWITCH CIRCUIT — Co nt in ued