Hummer H1 (2002+). Manual - part 107

______________

 Wheels and Tires/Central Tire Inflation System (CTIS)  6-43

®

05745159

CTIS INTERIOR HARNESS

NOTE: Prior to removal, tag all leads for installation.

Removal

1.

Remove CTIS instrument cluster panel.

2.

Disconnect connector from inflate/deflate and tire selector
switches (Figure 6-60).

3.

Remove lamp from air pressure gauge.

4.

Disconnect harness connector from I/P harness connector
and remove interior harness.

Cleaning and Inspection

Clean and inspect CTIS harness and connectors. Check for de-
fects such as frayed wires and cracks. Repair or replace defec-
tive parts.

Installation

1.

Position interior harness in approximate mounting location 
and connect harness connector to I/P harness connector 
(Figure 6-60).

2.

Install lamp in air pressure gauge.

3.

Connect connector to inflate/deflate and tire selector
switches.

4.

Install CTIS instrument cluster panel.

Figure 6-60:   CTIS Interior Harness Appearance

AIR PRESSURE

GAUGE

SCREW

INFLATE/

TIRE

SELECTOR

SWITCH

SWITCH

CONNECTORS

DEFLATE SWITCH

I/P HARNESS

CONNECTOR

CTIS INTERIOR

HARNESS

6-44

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

®

AIR PRESSURE SWITCH REPLACEMENT

WARNING:  CTIS components are subject to high air
pressure. Always relieve air pressure before loosening
or removing air system components by disconnecting
quick-disconnect valve assemblies. Failure to follow
this warning may result in serious injury.

NOTE: Front and rear air pressure switches are replaced simi-
larly.

Removal 

1.

Disconnect harness leads from air pressure switch.

2.

Remove air pressure switch from manifold.

CAUTION: Do not allow sealant into air system. Sealant will
damage CTIS components.

Installation 

1.

Apply sealant to threads and screw air pressure switch into 
manifold.

2.

Connect harness leads to air pressure switch.

Figure 6-61:   Air Pressure Switch Locations

9-S06-014

REAR AIR

PRESSURE

SWITCH

FRONT

AIR PRESSURE

SWITCH

MANIFOLD

HARNESS

LEADS

______________

 Wheels and Tires/Central Tire Inflation System (CTIS)  6-45

®

05745159

AIR PRESSURE INDICATOR LINES 
REPLACEMENT

WARNING:  CTIS components are subject to high air
pressure. Always relieve air pressure before loosening
or removing air system components by disconnecting
quick-disconnect valve assemblies. Failure to follow
this warning may result in serious injury.

Removal 

NOTE: Replacement procedures for the front and rear air pres-
sure indicator lines are basically the same. This procedure cov-
ers the front air pressure indicator line.

1.

Remove CTIS instrument cluster panel.

2.

Disconnect air pressure indicator lines from air pressure
gauge (Figure 6-62).

CAUTION: Do not allow sealant into air system. Sealant will
damage CTIS components.

NOTE: Apply sealant to threads prior to installation.

Installation 

1.

Connect air pressure indicator lines to air pressure gauge 
(Figure 6-62).

2.

Install CTIS instrument cluster panel.

Figure 6-62:   Front Air Pressure Indicator Line

GAUGE

AIR PRESSURE

LINES

INDICATOR

AIR PRESSURE

6-46

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

®

CTIS COMPRESSOR FUSE REPLACEMENT

Removal 

1.

Raise and secure hood.

2.

Remove the left side cowell cover and the fuse box cover.

3.

Remove the fuse from the box (Figure 6-63).

Installation 

1.

Install the fuse in the fuse box (Figure 6-63).

2.

Install the plastic cover on the fuse box and install the left
cowl cover.

3.

Lower and secure the hood.

Figure 6-63:   CTIS Compressor Fuse Location

CTIS COMPRESSOR RELAY REPLACEMENT

Removal 

1.

Raise and secure hood.

2.

Remove left cowl cover and fuse box cover.

3.

Remove relay from fuse box (Figure 6-64).

Installation 

1.

Install relay in fuse box (Figure 6-64).

2.

Install fuse box cover and left cowl cover.

3.

Lower and secure hood.

Figure 6-64:   CTIS Compressor Relay Mounting

9-OM5-004

CTIS 30

CTIS

FUSE

9-OM5-004

CTIS

PUMP

RELAY

RELAY