Symptom:
*NO RESP ON S E F ROM AU TOMATIC TEMP ERATU RE CON TROL
POSSIBLE CAUSES
CH E CK P OWERS AND GROUN DS TO THE AUTOMATIC TE MP E RATURE CONTROL
MODULE - INTE RN AL SH ORT TO GROUND
K-IC, ATC, H BM, CH M CIRCU IT SH ORTE D TO GROUND
MODULE - INTE RN AL SH ORT TO VOLTAGE
K-IC, ATC, H BM, CH M CIRCU IT SH ORTE D TO VOLTAGE
K-IC, ATC, H BM, CH M CIRCU IT OP EN
AUTOMATIC TE MPE RATURE CONTROL
TE S T ACTION AP PLICAB ILITY
1 Tur n th e ign it ion off.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol h a r n ess con nect or s.
Ch eck ea ch power a n d gr ou n d cir cu it to th e modu le.
Wer e an y pr oblem s fou n d?
All
Ye s → Refer to th e wir in g dia gr a m s loca t ed in t h e ser vice in for m a t ion t o
help isola t e an open or sh or t ed con dit ion . Repa ir as n ecessa r y.
Per for m BODY VERIFICATION TE ST - VE R 1.
No → Go To 2
2 Tur n th e ign it ion off.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol h a r n ess con nect or s.
Discon n ect t he DRBIII" from t h e DLC.
Mea su r e th e resista n ce between gr ou n d a n d t h e K-IC, ATC, H BM, CH M cir cu it .
Is t h e resista n ce below 5.0 ohm s?
All
Ye s → Go To 3
No → Go To 4
3 Tur n th e ign it ion off.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol h a r n ess con nect or s.
Mea su r e th e resista n ce between gr ou n d a n d t h e K-IC, ATC, H BM, CH M cir cu it .
Wh ile mon it or in g t h e oh m m et er, discon n ect ea ch modu le (IC, HBM, CH M) on e a t a
time.
NOTE: The vehicle may not be equipped with all the above modules.
Is t h e resista n ce below 5.0 ohm s wit h a ll t h e a bove modu les discon n ect ed?
All
Ye s → Repa ir t h e K-IC, ATC, H BM, CH M cir cu it for a sh or t to grou n d.
Per for m BODY VERIFICATION TE ST - VE R 1.
No → Repla ce th e Modu le, th a t wh en discon nect ed t h e sh or t wa s
elim in a t ed, in accor da n ce wit h th e ser vice in for m a t ion .
Per for m BODY VERIFICATION TE ST - VE R 1.
104
COM M U N I CAT I ON
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