Symptom List:
HEATER IN LOCKOUT MODE
HEATER OVERHEATED
SUCCESSIVE OVERHEATING
Te s t N o t e : Al l s y m p t o m s l i s t e d a b o v e a r e d i a g n o s e d u s i n g t h e s a m e t e s t s .
Th e t i tle fo r t h e t e s t s w i ll b e HE ATE R IN LOCKOU T MOD E.
Wh e n Mo n i to re d a n d S e t Co n d it i o n :
HEATER IN LOCKOUT MODE
Wh en Mon it or ed: Du r ing h ea t er a ctiva t ion a nd oper at ion .
Set Con dit ion : Th is DTC will set if m u lt iple at t em pt s to st a rt th e hea ter h ave fa iled or if
su ccessive over hea t in g occur s.
HEATER OVERHEATED
Wh en Mon it or ed: Aft er h ea ter act iva tion , wh en th e syst em is in a st ea dy st a te of
oper a t ion.
Set Condit ion : Th is DTC will set if th e Tem per at u re Sen sor ’s r esist a nce or Overh ea t in g
Sen sor ’s r esist a n ce is n ot wit h in t he expect ed par a met er s (coola n t t em per at u re in t h e
hea ter m odu le exceeds 105°C [221°F ]).
SUCCESSIVE OVERHEATING
Wh en Mon it or ed: Aft er h ea ter act iva tion , wh en th e syst em is in a st ea dy st a te of
oper a t ion.
Set Con dition : Th is DTC will set if su ccessive over h ea tin g occur s.
POSSIBLE CAUSES
CABIN H EATE R ASSE MBLY OR H EATER BOOSTER ASSE MBLY
HE ATE R’S COOLANT HOSE S RE STRICTE D/LE AKING/DAMAGE D
ENGINE ’S COOLIN G SYSTE M FAUL T
CABIN H EATE R OR HE ATE R BOOSTE R CONTROL UN IT
HE ATE R OVE RH E ATE D/SU CCE SSIVE OVE RHE ATING CLE ARE D, ADDITION AL DTC(S)
PRESENT
93
CABI N H EAT ER
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