Hummer H1 Service Manual page 808

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Step
1 Inspect battery condition and charge (Refer to
battery checking procedure this section). Are bat-
teries in good working condition and charged?
2 Using a DVOM set to measure voltage, place the
ground lead on a known good ground, and the
positive lead on the large blue wire at the starter
solenoid (CKT34).Have a helper turn the key to
start. Does the meter display adequate voltage?
3 Using a DVOM set to measure resistance, mea-
sure resistance between starter body and ground
terminal at the batteries. Does resistance meet
specifications?
4 Locate the start relay attached to the exterior fuse
box bracket.Using a DVOM set to measure volt-
age Back probe the 10 ga. lt.blue wire (CKT34).
Rotate the ignition to start. Is voltage present?
5 Using a DVOM set to measure voltage, place the
ground lead on a known good ground, and the
positive lead on the 10 ga. yel wire(CKT37) at the
start relay.Is voltage present ?
6 Using a DVOM set to measure voltage, place the
ground lead on a known good ground, and the
positive lead on the small light blue wire at the
start relay (CKT32). Rotate the ignition to start.
Does the meter display adequate voltage?
7 Using a DVOM set to measure ohms, place the
negative lead on a known good ground and probe
the black wire at the start relay(CKT59). With the
ignition switch off, does resistance read below
specified?
8 Disconnect the white wire (CKT33) at the shifter
under the vehicle. Using a DVOM set to measure
voltage, place the negative lead on a known good
ground, and the positive lead on the white wire
(CKT33) on the vehicle body harness. Have a helper
rotate the key to start. Is adequate voltage displayed?
9 Disconnect the blue wire(CKT32)at the shifter
housing. Tag leads for installation. Using a
DVOM set to measure ohms, measure resistance
across the neutral safety switch. Is resistance
below specification?
05745159
Starter Inoperative
Action
Electrical System
Value(s) Yes
Go to step 2
12v Repair or replace
starter and/or sole-
noid as necessary
<.2Ω go to step 4
12v Repair open or
short to ground in
CKT34 between
the start relay and
the starter sole-
noid.
12v Go to step 6
12v Go to step 7
<.2Ω Replace Start
Relay.
12v Go to step 9
<.2Ω Go to step 10
12-37
No
Recharge/Replace
batteries as neces-
sary
Go to step 3
Repair open or
bad connection in
ground circuit
between starter
and batteries
Go to step 5
Repair open or
short to ground in
CKT37 be-tween
start relay and bat-
teries.
Go to step 8
Repair open or bad
connection in
CKT59 between
start relay and
ground.
Go to step 11
Replace neutral
safety switch and
recheck.
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