Hummer H1 Service Manual page 913

12-136 Electrical System
Step
9 Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity A11 in C29(CKT151) with the positive
lead. With the ignition on and the cruise control
switch on, is voltage present?
10 Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity D10 in C27(CKT153) with the positive
lead. With the ignition on and the cruise control
resume/accel button depressed, is voltage
present?
11 Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity B11 in C29(CKT152) with the positive
lead. With the ignition on and the cruise control
set button depressed
12 Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity B10 in C29(CKT22) with the positive lead.
Depress the brake switch. Is voltage present?
13 Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity B9 in C29(CKT810) with the positive lead.
With the ignition on, is voltage present with the
brake NOT applied, and disappear when the brake
is depressed?
4-1-00
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Cruise Control Inoperative VIN Z (Continued)
Action Value(s) Yes
12v Check for loose
or poor connec-
tion at PCM if
none are found
replace the PCM.
12v Check for loose
or poor connec-
tion at PCM if
none are found
replace the PCM.
12v Check for loose
or poor connec-
tion at PCM if
none are found
replace the PCM.
12v go to step 13.
Brake OFF 12v Check for loose
Brake ON 0v or poor connec-
tion at PCM if
none are found
replace the PCM.
®
No
Repair open, bad
connection or
short to ground
in CKT151
between the
PCM and cruise
control arm.
Repair open, bad
connection or
short to ground
in CKT153
between the
PCM and cruise
control arm.
Repair open, bad
connection or
short to ground
in CKT152
between the
PCM and cruise
control arm.
Check for open
or short to
ground/voltage
in CKT 22, if
none found
replace brake
switch.
Check for open
or short to
ground/voltage
in CKT 810, if
none found
replace brake
switch.