Hummer H1 Service Manual page 814

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Step
30 Use a scan tool to clear the DTC's. Start the
engine. Allow the engine to idle until the engine
reaches normal operating temperature. Select the
DTC and the specific DTC function. Enter the
DTC number which was set. Operate the vehicle,
with the Conditions for Setting this DTC, until
the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?
31 Does the scan tool display any addition undiag-
nosed DTC's?
FUSE 4B
5 AMP
INTERIOR
FUSE BOX
TO
IGNITION
SWITCH
05745159
Glow Plugs Inoperative (Cont'd)
Action
Figure 2-72: Glow Plug Control Circuit Schematic
Electrical System
Value
Go to step 31.
Go to the appli-
cable DTC
FUSE 3A
20 AMP
EXTERIOR
C5-A4
A B C D D
LEFT IGN
BANK POWER
OUTPUT
A
B
RIGHT
BANK
C
OUTPUT
D
C A B
12-43
Yes No
Go to step 2.
System OK.
table.
HOT IN RUN
AND START
TO
STARTER
POS. STUD
FUSIBLE
LINK
BATT +
GLOW PLUG
RELAY
00-S12-011
4-1-00