Hummer H1 Service Manual page 852

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Step
11 Using a DVOM set to measure ohms, check resis-
tance between pin B (CKT 58) of the HVAC con-
trol head connector and a good ground. Does
resistance exceed specifications?
05745159
HVAC Temperature Door Inoperative (Continued)
Action
Electrical System
Value(s) Yes
<.2 Ω
Replace faulty
HVAC control
head.
12-79
No
Locate and
repair open or
poor connec-
tion in the
ground circuit
between pin B
and G4.
4-1-00