Ctis Rear Inflate Valve Inoperative - Hummer H1 Service Manual

12-56 Electrical System
Step
1 Disconnect front inflate solenoid. Using a DVOM
set to measure voltage connect the positive lead to
the grey wire(CKT92), and the negative lead to
the black wire(CKT57). With the ignition on,
selector switch set to both, and the compressor
switch to inflate, is voltage present?
2 Check continuity to ground on the black
wire(CKT57) at the rear inflate solenoid. Is resis-
tance below specification?
3 Remove selector switch and compressor switch
from the I/P. Using a DVOM set to measure volt-
age, ignition on, and compressor switch set to
inflate. Check for voltage on both yellow
wires(CKT144) at rear of selector switch. Is volt-
age present.
4 Ignition on, compressor switch on inflate, check
for voltage on yellow wires(CKT144)at rear of
compressor switch. Is voltage present?
5 Ignition on, check for voltage at both orange
wires(CKT640) at back of compressor switch. Is
voltage present?
6 Ignition on, compressor switch set to inflate,
selector switch set to both. Check for voltage at
the grey wire(CKT92) at the back of the selector
switch. Is voltage present?
4-1-00
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CTIS Rear Inflate Valve Inoperative

Action Value(s) Yes
12v Replace rear
inflate solenoid.
<.2 Ω
Go to step 3.
12v Go to step 6.
12v Repair open,
bad connection
or short in
CKT144
between com-
pressor switch
and selector
switch.
12v Replace com-
pressor switch.
12v Repair open,
bad connection,
or short in
CKT92 between
selector switch
and front inflate
valve.
®
No
Go to step 2.
Repair open or
bad connection
in CKT57
between rear
inflate solenoid
and G2.
Go to step 4.
Go to step 5.
Repair open,
bad connection
or short in
CKT640
between com-
pressor switch
and fuse 1G.
Replace the
selector switch.