Hummer H3. Manual — part 1749

WINDSHIELD GLASS CLEANING

Clean the windshield glass with windshield cleaner. The cleaner used should be one that will not
harm the paint finish or scratch the glass. The windshield glass is clean when water no longer
beads, but sheets across the entire glass surface.

BLADE ELEMENT CLEANING

1. Lift the wiper blade assemblies off of the windshield glass.

2. Clean the wiper blade element with a clean cloth saturated with full strength washer

solution.

3. Rinse the wiper blade assemblies with water.

4. Place the wiper blade assemblies back onto the windshield glass.

WIPER CHATTER REPAIR

Some vehicles may exhibit a condition where the windshield wiper blades chatter or wipe
unevenly. Several different conditions can cause the wiper blade chatter. To completely repair
wiper blade chatter, all of the following should be checked and repaired as necessary:

The windshield glass must be clean.

The wiper blade element must be clean.

The wiper arm tip pressure must be within specifications.

The wiper blade element set must be within specifications.

REAR WASHER HOSE REPLACEMENT

1

Tighten: 10 N.m (89 lb in)

2

Module, Windshield Washer (Qty: 1)
Tip: Rotate module assembly forward to remove from cowl panel.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Fig. 41: Washer Hose Replacement - Rear
Courtesy of GENERAL MOTORS CORP.

Rear Washer Hose Replacement

DESCRIPTION AND OPERATION

WIPER/WASHER SYSTEM DESCRIPTION AND OPERATION

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedure

1. Remove the rear wiper motor. Refer to Rear Window Wiper Motor Replacement.

2. Remove the left body side trim. Refer to Body Side Trim Panel Replacement - Left

Side .

1

Hose, Bodyside Electrical Harness Washer (Qty: 1)
Tip: Release connector claws from rear washer hose connection.

2

Hose, Rear Windshield Washer (Qty: 1)
Tip: Pull the washer hose rearward from the endgate and out from the washer
elbow opening.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Wiper/Washer System Components

The Wiper/Washer System consists of the following components:

Windshield wiper/washer switch

Body control module (BCM)

Wiper micro relay

Wiper 2 relay

Wiper diode

Windshield wiper motor

Windshield washer pump

Windshield washer nozzles

Windshield washer solvent container

Windshield wiper arm and blade assemblies

Windshield wiper transmission

WIP/WASH 10A fuse

WIPER 25A fuse

Refer to Wiper/Washer Component Views.

Wiper/Washer System Description

The body control module (BCM) controls wiper motor low speed operation. The washer pump
and high speed operation are controlled directly by the wiper/washer switch. The windshield
wiper/washer switch supplies voltage on the signal circuits to the BCM for windshield
wiper/washer operation. When WASH, MIST, DELAY, LOW or HIGH is detected, the BCM
energizes the wiper micro relay by suppling voltage to the relay coil. This allows battery voltage
from the WIPER fuse to flow through the relay switched input then through the contacts and out
the relay switched output to the wiper 2 relay switch contacts. Since the wiper 2 relay switch
contacts are normally closed to the low speed circuit of the windshield wiper motor, the motor
will operate at low speed.

Wash Operation

In the WASH position windshield wiper/washer switch supplies voltage to the windshield washer
pump. The body control module (BCM) monitors voltage on this circuit to detect when a wash
cycle is requested so it can enable the wipers. After a short delay, the BCM energizes the wiper
relay which will operate the windshield wiper motor at low speed. The wiper motor will
continue to operate for 2 wipe cycles after the wash switch is released.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Mist Operation

Windshield Wiper/Washer System mist operation is identical to low operation, except that the
mist switch is a press and release type switch. When the wiper switch is moved to the mist
position and released, low speed wiper motor operation is started and will continue until 1 cycle
is complete. If the wiper switch is moved to the MIST position and held, the wiper motor will
operate in the LOW mode until the switch is released.

In the MIST position, voltage is supplied through an internal resistor to the signal circuit of the
windshield wiper/washer switch for the body control module (BCM). The BCM will energize the
wiper micro relay which will operate the windshield wiper motor at low speed.

Intermittent Operation

Windshield wiper delay operation is a low speed wiper motor function with a variable delay
interval between the wiper motor cycles. The delay interval is determined by a series of 5
resistors within the wiper/washer switch. During delay wiper operation the signal circuit voltage
is further reduced through the delay resistors. The body control module (BCM) monitors the
voltage on the signal circuit to determine the delay interval between the low speed wiper motor
cycles.

If the wiper switch is moved from a longer delay interval to a shorter delay interval, the BCM
will command an immediate wipe cycle and reset the delay timer to the shorter delay interval.

Low Speed Operation

When the wiper switch is in the Low position, voltage is supplied through an internal resistor to
the signal circuit. The body control module (BCM) monitors the windshield wiper switch signal 1
circuit and energizes the wiper micro relay which will operate the windshield wiper motor. The
wiper motor will operate at low speed, since the wiper 2 relay is de-energized. Low speed can
also be commanded with a scan tool, by commanding Wiper Relay Cmd. ON and OFF. Refer to
Scan Tool Output Controls.

High Speed Operation

In the High position, the windshield wiper/washer switch supplies voltage to both the wiper
micro relay and wiper 2 relay coils. This energizes both relays and allows battery voltage from
the wiper micro relay switched output to the switched input of the wiper 2 relay through its
contacts and out the switched output of the wiper 2 relay to the high speed circuit of the
windshield wiper motor. The windshield wiper motor will operate at high speed. During high
speed wiper motor operation the wiper switch signal circuit is at the low speed signal voltage and
the body control module (BCM) supplies redundant voltage to the wiper relay via the wiper

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3