Hummer H1 (2006+). Manual — part 226

6-54

Wheels and Tires/Central Tire Inflation System (CTIS)

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Figure 6-57: CTIS Interior Harness Appearance

AIR PRESSURE SWITCH REPLACEMENT

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

NOTE: The front and rear air pressure switches are replaced similarly.

Removal

1.

Disconnect the harness leads from the air pressure switch.

2.

Remove the air pressure switch from the manifold.

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

Installation

1.

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

2.

Connect the harness leads to the air pressure switch.

I/P HARNESS

CONNECTOR

CTIS INTERIOR

HARNESS

SWITCH

CONNECTORS

AIR PRESSURE

GAUGE

______________

Wheels and Tires/Central Tire Inflation System (CTIS) 6-55

5745804

Figure 6-58: Air Pressure Switch Locations

AIR PRESSURE INDICATOR LINES REPLACEMENT

WARNING: The CTIS components are subject to high air pressure. Always relieve the air pressure before loosen-
ing 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 pressure indicator lines are basically the same.

1.

Remove the CTIS module from the instrument panel.

NOTE: Mark the position of the air indicator lines before removing.

2.

Disconnect the air pressure indicator lines from the air pressure gauge (Figure 6-59).

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

NOTE: Apply sealant to the threads prior to installation.

Installation

1.

Connect the air pressure indicator lines to the air pressure gauge in the position they were in prior to removal (Figure 6-59).

2.

Install the CTIS module to the instrument panel.

REAR AIR

PRESSURE

SWITCH

FRONT

AIR PRESSURE

SWITCH

MANIFOLD

HARNESS

LEADS

6-56

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

Figure 6-59: Front Air Pressure Indicator Line

CTIS COMPRESSOR FUSE REPLACEMENT

Removal

1.

Raise and secure the hood.

2.

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

3.

Remove the fuse from the box (Figure 6-60).

Installation

1.

Install the fuse in the fuse box (Figure 6-60).

2.

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

3.

Lower and secure the hood.

GAUGE

AIR PRESSURE

AIR PRESSURE

LINES

INDICATOR

______________

Wheels and Tires/Central Tire Inflation System (CTIS) 6-57

5745804

Figure 6-60: CTIS Compressor Fuse Location

CTIS COMPRESSOR RELAY REPLACEMENT

Removal

1.

Raise and secure the hood.

2.

Remove left cowl cover and fuse box cover.

3.

Remove relay from fuse box (Figure 6-61).

Installation

1.

Install relay in fuse box (Figure 6-61).

2.

Install fuse box cover and left cowl cover.

3.

Lower and secure hood.

Figure 6-61: CTIS Compressor Relay Mounting

DEFLATE VALVE ASSEMBLY REPLACEMENT

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

CTIS

FUSE

CTIS

PUMP

RELAY

RELAY