Hummer H1 (2006+). Manual — part 343

12-48

Electrical System

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CTIS Compressor Inoperative (Figure 12-102)

Step

Action

Value(s)

Yes

No

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?

+12v

Replace the

compressor

Go to step 2.

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?

+12v

Repair open or

bad connection

in CKT57

between com-

pressor and G2.

Go to step 3.

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?

+12v

Go to step 7.

Go to step 4.

4

Using a DVOM, set to measure resistance, check
continuity to ground at cavity 2 of the compressor
relay socket. Is resistance below specification?

<.2

1

Go to step 5.

Repair open or

bad connection

in CKT59

between com-

pressor relay

and G2.

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?

+12v

Repair open or

bad connection

in CKT46

between com-

pressor switch

and relay.

Go to step 6.

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?

+12v

Replace the

compressor

switch.

Repair open,

bad connection

or short in

CKT640

between com-

pressor switch

and fuse 1G.

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?

<.2

1

Go to step 8.

Repair open,

bad connection,

or short in

CKT437

between relay

and compressor.

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
2(CKT59). Is voltage present?

<.2

1

Replace the

compressor

relay.

Repair open,

bad connection

or short in

CKT436

between com-

pressor relay

and Maxi

fuse#6.

______________________________________________________

Electrical System 12-49

CTIS Exhaust Valve Inoperative (Figure 12-102)

Step

Action

Value(s)

Yes

No

1

Disconnect exhaust solenoid. Using a DVOM, set
to measure voltage, probe the light green
wire(CKT47) with the positive lead, and the black
wire(CKT57) with the negative lead. Ignition on,
move the compressor switch to deflate. Is voltage
present?

+12v

Replace exhaust

solenoid.

Go to step 2.

2

Check continuity to ground on the black
wire(CKT57) at the exhaust solenoid. Is resis-
tance below specification?

<.2

1

Go to step 3.

Repair open or

bad connection

in CKT57

between exhaust

solenoid and

G2.

3

Remove compressor switch. Using a DVOM, set
to measure voltage, check for voltage at both
orange wires (CKT640). With ignition on is volt-
age present?

+12v

Go to step 4.

Repair open,

bad connection

or short in

CKT640

between com-

pressor switch

and fuse 1G.

4

Using a DVOM, set to measure voltage, check for
voltage at the light green wire(CKT47) with the
ignition on and compressor switch to deflate. Is
voltage present?

+12v

Repair open bad

connection or

short in CKT 47

between com-

pressor switch

and exhaust

solenoid.

Replace com-

pressor switch.

CTIS Front Inflate Valve Inoperative (Figure 12-102)

Step

Action

Value(s)

Yes

No

1

Disconnect front inflate solenoid. Using a
DVOM, set to measure voltage connect the posi-
tive lead to the tan wire(CKT91), and the negative
lead to the black wire(CKT57). With the ignition
on, selector switch set to both, and the compres-
sor switch to inflate, is voltage present?

+12v

Replace front

inflate solenoid.

Go to step 2.

2

Check continuity to ground on the black
wire(CKT57) at the front inflate solenoid. Is
resistance below specification?

<.2

1

Go to step 3.

Repair open or

bad connection

in CKT57

between front

inflate valve

and G2.

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.

+12v

Go to step 6.

Go to step 4.

12-50

Electrical System

_______________________________________________________

4

Ignition on, compressor switch on inflate, check
for voltage on yellow wires(CKT144)at rear of
compressor switch. Is voltage present?

+12v

Repair open,

bad connection

or short in

CKT144

between com-

pressor switch

and selector

switch.

Go to step 5.

5

Ignition on, check for voltage at both orange
wires(CKT640) at back of compressor switch. Is
voltage present?

+12v

Replace com-

pressor switch.

Repair open,

bad connection

or short in

CKT640

between com-

pressor switch

and fuse 1G.

6

Ignition on, compressor switch set to inflate,
selector switch set to both. Check for voltage at
the tan wire(CKT91) at the back of the selector
switch. Is voltage present?

+12v

Repair open,

bad connection,

or short in

CKT91 between

selector switch

and front inflate

valve.

Replace the

selector switch.

CTIS Rear Inflate Valve Inoperative (Figure 12-102)

Step

Action

Value(s)

Yes

No

1

Disconnect front inflate solenoid. Using a
DVOM, set to measure voltage connect the posi-
tive lead to the grey wire(CKT92), and the nega-
tive lead to the black wire(CKT57). With the
ignition on, selector switch set to both, and the
compressor switch to inflate, is voltage present?

+12v

Replace rear

inflate solenoid.

Go to step 2.

2

Check continuity to ground on the black
wire(CKT57) at the rear inflate solenoid. Is resis-
tance below specification?

<.2

1

Go to step 3.

Repair open or

bad connection

in CKT57

between rear

inflate solenoid

and G2.

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.

+12v

Go to step 6.

Go to step 4.

CTIS Front Inflate Valve Inoperative (Figure 12-102)

Step

Action

Value(s)

Yes

No

______________________________________________________

Electrical System 12-51

4

Ignition on, compressor switch on inflate, check
for voltage on yellow wires(CKT144)at rear of
compressor switch. Is voltage present?

+12v

Repair open,

bad connection

or short in

CKT144

between com-

pressor switch

and selector

switch.

Go to step 5.

5

Ignition on, check for voltage at both orange
wires(CKT640) at back of compressor switch. Is
voltage present?

+12v

Replace com-

pressor switch.

Repair open,

bad connection

or short in

CKT640

between com-

pressor switch

and fuse 1G.

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?

+12v

Repair open,

bad connection,

or short in

CKT92 between

selector switch

and front inflate

valve.

Replace the

selector switch.

CTIS Rear Inflate Valve Inoperative (Figure 12-102)

Step

Action

Value(s)

Yes

No