Hummer H1 (2006+). Manual - part 358

12-108

Electrical System

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Depress the brake pedal slightly. This turns off the cruise control operation. but does not erase the speed memory. To resume
cruise control after touching the brake pedal, follow the instructions under “Resuming a set Speed”.

In addition, the cruise control is automatically disabled each time you turn the engine off, Or shift into “P” (Park) “N” (Neutral) po-
sition, or if the “Check Throttle Light” is illuminated.

Resuming a Set Speed

If the cruise control was turned off by depressing the brake pedal slightly, move the cruise control switch from “ON” to “R/A” and
hold for approximately one second and release. The vehicle will gradually return to the previously set speed and maintain it.

Resuming a set speed will not function if the cruise control was turned off using the cruise control switch, or if the vehicle speed is
below cruise control minimum (35 MPH).

Using Cruise Control on Hills

Driving on a hill can affect the performance of the cruise control. This performance can be greatly affected if the vehicle is loaded
or towing a trailer. Use of the accelerator pedal will help maintain vehicle speed but brakes will turn cruise off. If vehicle speed is
being significantly reduced or increased when using the cruise control on a hill, turn the cruise control off and manually control the
vehicle speed.

Inspection

When working on the cruise control system make sure that there are no other problems with the ECM or fueling system. Always
road test and verify the problem before attempting any repairs.

Intermittent problems

All of the charts in this section are for use on current failures. Do not attempt to use these charts to diagnose a problem unless the
problem has been verified and currently exists. If the problem is intermittent, parts will be replaced, or no problem will be found.

Cruise Control Inoperative (Figure 12-101)

Step

Action

Value(s)

Yes

Important: Before clearing the DTC’s, use the scan
tool Capture Info in order to record the Freeze Frame
and the failure records for reference, as the data will
be lost when the Clear Info function is used.
Was the Powertrain On-Board Diagnostic (OBD) Sys-
tem check performed?

Go to step 2.

Perform on-board
diagnostic system

check.

Disconnect cruise control lever from cross body harness
under dash. Using a DVOM, set to measure resistance,
Probe terminal A with the negative lead and terminal B
with the positive lead. Turn the cruise on\off switch to
“on”. Does the resistance meet specification?

<.2

Go to step 3.

Replace cruise

control arm.

Leave the negative lead in the terminal B, place the
positive lead in terminal C. With the resume switch in
the neutral position, the switch should be open. When
the resume switch is moved to the spring loaded posi-
tion, the switch should close and meet the resistance
specification?

neutral-open

closed<.2

Go to step 4.

Replace cruise

control arm.

Leave the negative lead in terminal B, place the posi-
tive lead in terminal D. With the set switch in the neu-
tral position, the meter should display an open, with
the switch pushed in the meter should display continu-
ity, does it?

neutral-open

closed<.2

Go to step 5.

Replace cruise

control arm.

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Electrical System 12-109

Connect scan tool to vehicle, locate cruise control On/
Off switch in the engine data list. When the switch is
moved on and off, does the engine data list reflect the
change?

Go to step 6.

Go to step 9.

Locate resume/accel switch in engine data list. When
the switch is moved to the resume/accel position, does
the engine data list reflect the change?

Go to step 7.

Go to step 10.

Locate set/coast in engine data list. When the switch is
pushed, does the data list reflect the change?

Go to step 8.

Go to step 11.

Locate the brake switches in the engine data list,
depress the brake pedal, does the data list reflect the
change?

Check for loose or
poor connection at

ECM if none are

found replace the

ECM.

Go to step 16.

Using a DVOM, set to measure resistance, place the
ground lead on the IP ground point. Back probe C27-59
(CKT 151GY) with the positive lead. With the cruise
control switch on, does the resistance meet specification?

<.2

Check for loose or
poor connection at

ECM if none are

found replace the

ECM.

Repair open, bad

connection or short

to ground in CKT

151GY between

the ECM and

cruise control arm.

Using a DVOM, set to measure resistance, place the
ground lead on the IP ground point. Back probe cavity
C27-58 (CKT 153LG) with the positive lead. With the
ignition on and the cruise control resume/accel button
depressed, does the resistance meet specification?

<.2

Check for loose or
poor connection at

ECM if none are

found replace the

ECM.

Repair open, bad

connection or short

to ground in CKT

153LG between

the ECM and

cruise control arm.

Using a DVOM, set to measure resistance, place the
ground lead on the IP ground point. Back probe cavity
C27-60 (CKT 152DB) with the positive lead. With the
ignition on and the cruise control set button depressed
does the resistance meet specification?

<.2

Check for loose or
poor connection at

ECM if none are

found replace the

ECM.

Repair open, bad

connection or short

to ground in CKT

152DB between

the ECM and

cruise control arm.

Using a DVOM, set to measure voltage, place the
ground lead on the IP ground point. Back probe cavity
C27-64 (CKT 22RD) with the positive lead. Depress
the brake switch. Is voltage present?

+12v

Go to step 13.

Check for open or

short to ground/

voltage in CKT

22RD, if none

found replace

brake switch.

Using a DVOM, set to measure resistance, place the
ground lead on the IP ground point. Back probe cavity
C27-54 (CKT 809TN) with the positive lead. Does the
resistance meet the specification?

BRAKE

Applied

Not Applied

<.2

Check for loose or
poor connection at

ECM if none are

found replace the

ECM.

Check for open or

short to ground/

voltage in CKT

809TN, if none

found replace

brake switch.

Cruise Control Inoperative (Cont’d) (Figure 12-101)

Step

Action

Value(s)

Yes

12-110

Electrical System

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AUDIO SYSTEM DESCRIPTION

Audio systems are available in two configurations:

The standard system, available on fleet only consists of an AM/FM radio and either two or four coaxial speakers (Figure 12-73).

The Monsoon system (Figure 12-72), available on models 84 and 90, uses a radio head and CD player with a total of six coaxial
speakers and two subwoofers. The coaxial speakers are located in an overhead console and the two subwoofers are housed in a box
located under the left rear seat. An amplifier producing 200 watts on eight channels is mounted in the overhead console. The ampli-
fier is activated by output on the left rear channel from the radio. Rear seat audio, included in the monsoon package, provides sec-
ond audio access to the radio system with the aid of headphones (Figure 12-74).

Figure 12-72: Monsoon Radio Face

Figure 12-73: Standard Radio Face

Figure 12-74: Rear Seat Audio Face

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Electrical System 12-111

Radio Replacement

Removal

Remove the four screws securing the center dash bezel and the bezel (See Figure 12-75).

Remove the three screws securing the radio to the center dash assembly.

Pull the radio out far enough to gain access to the radio connector.

Disconnect the connector and remove the radio.

Figure 12-75: Radio Removal.

Installation

Connect the two harness connectors to the back of the radio.

Secure the radio to the center dash assembly with the three screws.

Line the trim piece with the radio and secure with the four mounting screws.

Overhead Console, Speaker And Amplifier Replacement (Monsoon Except Model 90)

Removal

Remove the four screws securing the speaker grill and the speaker to the roof. (See Figure 12-76)

Repeat step one for all four front speakers.

Remove the headliner.

Disconnect the 32 pin connector from the amplifier and the four screws securing the amplifier to the mounting bracket.

Remove the amplifier.

Installation

Mount the amplifier to the mounting bracket with the four screws, and connect the 32 pin connector to the amplifier.

Reinstall the head liner and re connect all the wiring.

RADIO

MOUNTING

BRACKET

CENTER

DASH

ASSEMBLY

BEZEL

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