Symptom:
SYS TEM U ND ERVOLTAGE
POSSIBLE CAUSES
INTERMITTENT DTC
DAMAGE D CAB/CAB HARN E SS CONNE CTOR
FUSE D OPTIONAL E QU IP ME NT RE LAY OUTP U T CIRCU IT HIGH RE SISTANCE
FUSE D B(+) CIRCUIT HIGH RE SISTANCE
GROUND CIRCUIT HIGH RE SISTANCE
ANTI-LOCK BRAKE CONTROLLE R
TE S T ACTION AP PLICAB ILITY
1 NOTE: An undercharged battery may cause this DTC to set. Repair any
Powertrain charging system DTCs before continuing.
Tur n th e ign it ion on .
Wit h th e DRBIII",readDTCs.
Wit h th e DRBIII",eraseDTCs.
Tur n th e ign it ion off.
Tur n th e ign it ion on .
Star t t he engine.
Wit h th e DRBIII",readDTCs.
Does t h is DTC r eset ?
All
Ye s → Go To 2
No → Go To 6
2 Tur n th e ign it ion off.
Discon n ect t he CAB ha r n ess con n ect or.
In spect t h e CAB/CAB ha r n ess con n ect or for da m a ge.
Is t h er e an y br oken , ben t , pu sh ed ou t , corr oded or sprea d t er m in a ls?
All
Ye s → Repa ir a s n ecessa ry.
Per for m ABS VE RIF ICATION TE ST - VER 1.
No → Go To 3
3 Tur n th e ign it ion off.
Discon n ect t he CAB ha r n ess con n ect or.
Tur n th e ign it ion on .
Usin g a 12-volt test ligh t conn ect ed t o gr ou n d, ch eck t h e F u sed Opt ion a l E qu ipm en t
Rela y Ou t pu t cir cu it a t th e CAB 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.
Does t h e test ligh t illu min a t e br igh t ly?
All
Ye s → Go To 4
No → Repa ir t h e F u sed Opt ion a l Equ ipm en t Rela y Ou t pu t cir cu it for
high resist a n ce.
Per for m ABS VE RIF ICATION TE ST - VER 1.
77
BRAK ES (CAB)