Ctis Compressor Inoperative - Hummer H1 Service Manual

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Step
1 Using a DVOM set to measure voltage, probe the
terminals on the CTIS compressor. With the CTIS
compressor switch set to inflate, and the ignition
on, is voltage present?
2 Move the ground lead to a known good ground
and the positive lead still on the compressor, igni-
tion on, compressor switch on inflate. Is voltage
present?
3 Remove compressor relay from the exterior fuse
box. Using a DVOM set to measure voltage,
Probe cavity 1(CKT46) of the CTIS compressor
relay socket with the positive lead, and cavity
2(CKT59) with the negative lead. Ignition on,
CTIS compressor switch to on, is voltage present?
4 Using a DVOM set to measure voltage, check
continuity to ground at cavity 2 of the compressor
relay socket. Is resistance below specification?
5 Remove compressor switch from the dash. Using
a DVOM set to measure voltage. Ignition on,
compressor switch set to inflate. Check for volt-
age on white wire(CKT46). Is voltage present?
6 Using a DVOM set to measure voltage, turn the
ignition on. Check for voltage at both orange
wires(CKT640) at the rear of the compressor
switch. Is voltage present?
7 Using a DVOM set to measure continuity mea-
sure continuity between cavity 5(CKT437) of the
compressor relay socket and the green
wire(CKT437) at the compressor. Is resistance
below specifications?
8 Using a DVOM set to measure voltage, place the
positive lead in cavity 3 (CKT436) of the com-
pressor relay. Place the ground lead in cavity
86(CKT59). Is voltage present?
05745159

CTIS Compressor Inoperative

Action
Electrical System
Value(s) Yes
12v Replace the
compressor
12v Repair open or
bad connection
in CKT57
between com-
pressor and G2.
12v Go to step 7.
<.2 Ω
Go to step 5.
12v Repair open or
bad connection
in CKT46
between com-
pressor switch
and relay.
12v Replace the
compressor
switch.
<.2 Ω
Go to step 8.
<.2 Ω
Replace the
compressor
relay.
12-53
No
Go to step 2.
Go to step 3.
Go to step 4.
Repair open or
bad connection
in CKT59
between com-
pressor relay
and G2.
Go to step 6.
Repair open,
bad connection
or short in
CKT640
between com-
pressor switch
and fuse 1G.
Repair open,
bad connection,
or short in
CKT437
between relay
and compressor.
Repair open,
bad connection
or short in
CKT436
between com-
pressor relay
and Maxi
fuse#6.
4-1-00