Hummer H1 (2006+). Manual - part 343

 

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Hummer H1 (2006+). Manual - part 343

 

 

12-48

Electrical System

_______________________________________________________

 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

 

 

 

 

 

 

 

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