Hummer H1 (2002+). Manual — part 228

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Electrical System 12-134.3

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05745159

Figure 12-131: Power Side Mirror Schematic

59 BK

1

2

3

4

5

6

7

8

9

M

M

LH POWER MIRROR

M

M

RH POWER MIRROR

FUSE

3H

20 AMP

517 PK

948 DG/

YL

953 DG

947 DG/

YL

952 DB

942 OR/ BK

944 OR

17 PP

TO
DIMMER
MODULE

POWER MIRROR SWITCH

LH UP

/ DOWN

RH UP

/ DOWN

RH LEFT / RIGHT

LH LEFT / RIGHT

G4

TO

BATTERY

C23

GROUND

BA

TTER

Y

FEED

COMMON

COMMON

SWITCH ILLUM

9-S12-010

J

H

F

E

B

C

D

G

G1

C3

J8

M9

J9

L8

K6

K8

C25

A

B

C

C24

C

B

A

A

INTERIOR

FUSE BOX

N6

3-1-01

12-134.4

Electrical System

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CRUISE CONTROL SYSTEMS

WARNING: Testing of cruise control should only be
preformed in areas were traffic is light and the road
conditions are stable.

Figure 12-130.1 : Cruise Control

Operation of Cruise Control

1.

Move the cruise control switch to the “ON” position.

2.

Accelerate to the desired speed.

3.

Push in the “SET” button on the end of the turn signal
lever and release it at the desired speed. This will set the
vehicle speed.

NOTE:

The vehicle speed will decrease

while the “SET” button is pushed in

.

The cruise control will not operate under 35 MPH.

Accelerating with the Cruise Control On

Vehicle speed can be momentarily increased after the desired
speed has been set. By pressing the accelerator pedal the speed
will increase. This action will not interfere with the preset
cruising speed. The preset speed will resume after the accelera-
tor pedal is released.

Resetting the Cruise Control to a Higher Speed

There are two ways to reset the cruise control to a higher
speed.

1.

Press the accelerator pedal until the desired speed is
reached. Push the “SET” button and release it. Speed
should set like normal.

2.

Move the cruise control switch from “ON” to “R/A”. Hold
the switch in place until you reach the desired speed and
then hold the control switch in the “R/A” position for half
a second and release. Each time this is done the vehicle
speed will increase by 1 MPH.

Turning Off the Cruise Control

There are two ways to turn the cruise control off while driving:

1.

Move the cruise control switch to the “OFF” position.

2.

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” (Neu-
tral) position, 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 con-
trol. 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 PCM 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 prob-
lem is intermittent, parts will be replaced, or no problem will
be found.

9-OM2-031

3-1-01

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Electrical System 12-135

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05745159

Cruise Control Inoperative VIN Z

Step

Action

Value(s)

Yes

No

1

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

Go to step 2.

Perform on-

board diagnos-

tic system check.

2

Disconnect cruise control lever from cross body
harness under dash. Using a DVOM set to mea-
sure resistance, Probe the BRN wire with the neg-
ative lead and the RD wire with the positive lead.
Turn the cruise on\off switch to “on”. Does the
resistance meet specification?

<.2

Ω

Go to step 3.

Replace cruise

control arm.

3

Leave the negative lead in the BRN wire, place
the positive lead in the YL wire. With the resume
switch in the neutral position, the switch should
be open. When the resume switch is moved to the
spring loaded position, the switch should close
and meet the resistance specification?

neutral-open

closed<.2

Ω

Go to step 4.

Replace cruise

control arm.

4

Leave the negative lead in the BRN wire, place
the positive lead in the GRN wire. With the set
switch in the neutral position, the meter should
display an open, with the switch pushed in the
meter should display continuity, does it?

neutral-open

closed<.2

Ω

Go to step 5.

Replace cruise

control arm.

5

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.

6

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.

7

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.

8

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 connec-

tion at PCM if

none are found

replace the PCM.

Go to step 16.

4-1-00

Section 12 Electrical System

12-136

Electrical System

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9

Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity A11 in C29(CKT151) with the positive
lead. With the ignition on and the cruise control
switch on, is voltage present?

12v

Check for loose
or poor connec-

tion at PCM if

none are found

replace the PCM.

Repair open, bad

connection or

short to ground

in CKT151

between the

PCM and cruise

control arm.

10

Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity D10 in C27(CKT153) with the positive
lead. With the ignition on and the cruise control
resume/accel button depressed, is voltage
present?

12v

Check for loose
or poor connec-

tion at PCM if

none are found

replace the PCM.

Repair open, bad

connection or

short to ground

in CKT153

between the

PCM and cruise

control arm.

11

Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity B11 in C29(CKT152) with the positive
lead. With the ignition on and the cruise control
set button depressed

12v

Check for loose
or poor connec-

tion at PCM if

none are found

replace the PCM.

Repair open, bad

connection or

short to ground

in CKT152

between the

PCM and cruise

control arm.

12

Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity B10 in C29(CKT22) 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 22, if

none found

replace brake

switch.

13

Using a DVOM set to measure voltage, place the
ground lead on the IP ground point. Back probe
cavity B9 in C29(CKT810) with the positive lead.
With the ignition on, is voltage present with the
brake NOT applied, and disappear when the brake
is depressed?

Brake OFF 12v

Brake ON 0v

Check for loose
or poor connec-

tion at PCM if

none are found

replace the PCM.

Check for open

or short to

ground/voltage

in CKT 810, if

none found

replace brake

switch.

Cruise Control Inoperative VIN Z (Continued)

Step

Action

Value(s)

Yes

No

4-1-00