Hummer H1 (2002+). Manual — part 207

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Electrical System 12-55

®

05745159

CTIS Front Inflate Valve Inoperative

Step

Action

Value(s)

Yes

No

1

Disconnect front inflate solenoid. Using a DVOM
set to measure voltage connect the positive 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 compressor 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 resis-
tance below specification?

<.2

Ω

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.

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.

4-1-00

12-56

Electrical System

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®

CTIS Rear Inflate Valve Inoperative

Step

Action

Value(s)

Yes

No

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?

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

Ω

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.

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.

4-1-00

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Electrical System 12-57

®

05745159

Figure 2-78: CTIS Schematic

REAR

SOL

DEFLATE

SOL

FRONT

SOL

FRONT

LOW

PRESSURE

REAR

LOW

PRESSURE

57 BK

92 GY

57 BK

47 LG

57 BK

91 TN

A

B

A

B

A

B

G2

640 OR

428 PK

640 OR

428 PK

C1-24

C1-58

C1-63

C1-23

C1-57

C3-C4

C3-C2

C3-C3

R

F

C12-F

C12-D

C12-E

WARNING LAMP

MINI

FUSE

1G

5 AMP

INTERIOR

FUSE

BOX

CTIS

WARNING

M

MAXI

FUSE

6

30 AMP

ENGINE

FUSE

BOX

CTIS

COMPRESSOR

CTIS

COMPRESSOR

TIRE

SELECTOR

144 YL

144 YL

INFLATE/

DEFLATE

STATUS

CENTER

IP

TO BUZZER

(fuse box)

COMPRESSOR

RELAY

57 BK

G2

437 DG

G3

59 BK

436 YL

46 WH

C1-59

C3-G4

G4

59 BK

C12-K

C3-B4

C12-G

C3-B3

C12-H

C3-B4

C12-J

TO

BATTERY

9-S12-002

4-1-00

12-58

Electrical System

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®

Figure 2-79: Lights Schematic (Sheet 1 of 2)

9-S12-006.1

SIDE MARKER

CLEARANCE PARK/TURN

HEAD

LIGHTS

13TN

3 LB

12 DR

58 BK

20 RD

2 LG

CLEARANCE

PARK/TURN

SIDE MARKER

3 LB

2 LG

80 WH

80 WH

58 BK

12 DR

13TN

58 BK

20 RD

UNDER

HOOD

LAMP

HOOD

HARNESS

A B

C

A

B

C

D

G4

C2-2

C1-73

C2-3

C1-65

C2-4

C1-66

C2-5

C1-47

C2-6

46

C2-7

C1-41

IDENTIFICATION

SIDE MARKER

ID

STOP/

TAIL/ TURN

BACKUP

G1

ID

59 BK

5 DG

21 GY

59 BK

21 GY

9 YL

140 OR

29

C2-30

C2-25

C1-74

C1-72

5 DG

21 GY

C1-71

TO IP

INDICATOR

LAMPS

G3

BACKUP

STOP/

TAIL/ TURN

SIDE MARKER

IDENTIFICATION

4-1-00