Hummer H3. Manual — part 1397

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DIAGNOSTIC STARTING POINT - LIGHTING SYSTEMS

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic
System Check will provide the following information:

Pin

Wire Color

Circuit No.

Function

A

D-GN

619

Right Rear Turn Signal Lamp Supply
Voltage

B

-

-

Not Used

G

BK

1450

Ground

DTC

Description

DTC B0525 (W/O RPO
CW9 )

Left Turn Signal Circuit

DTC B0525 (With RPO
CW9)

Rear Fog Lamp Relay Fault

DTC B0527, B0528 or
B0529

Right Turn Signal Circuit

DTC B0530 (W/O RPO
CW9)

Right Turn Signal Circuit

DTC B0532, B0533 or
B0534

Left Turn Signal Circuit

DTC B2532 or B2533

Front Fog Lamps Control Circuit

DTC B2557 or B2558

Passenger Compartment Lamp Control Circuit

DTC B2575

Headlamp Control Circuit

DTC B2582 or B2583

Headlamp High Beam Control Circuit

DTC B2585

Park Lamp Control Circuit

DTC B2602 or B2603

Daytime Running Lamp Control Circuit

DTC B2622 or B2623

Dimming Display Pulse Width Modulation (PWM) Input

Circuit

DTC B2624

Dimming Display Pulse Width Modulation (PWM) Input

Circuit Open

DTC B2647 or B2648

Ambient Light Sensor Circuit

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

The identification of the control modules which command the system

The ability of the control modules to communicate through the serial data circuit

The identification of any stored DTCs and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the
system and where the procedure is located.

SCAN TOOL OUTPUT CONTROLS

Body Control Module (BCM)

Scan Tool

Output Control

Additional Menu

Selection(s)

Description

Body Control
Module

High Beams

The BCM activates the beam select relay
illuminating the high beam headlamps and high
beam indicator when you select ON while the low
beam headlamps are on. The high beam headlamps
and indicator remain illuminated for 5 seconds.

Body Control
Module

Headlamps

The BCM activates the headlamp relay illuminating
the low beam headlamps when you select ON. The
low beam headlamps remain illuminated for 5
seconds.

Body Control
Module

Parking Lamps

The BCM activates the park lamp relay illuminating
the parking lamps when you select ON. The parking
lamps remain illuminated for 5 seconds.

Body Control
Module

Courtesy Lamps

The BCM activates the interior courtesy lamps
when you select ON. The interior courtesy lamps
remain illuminated for 5 seconds.

Body Control
Module

Front Fog Lamps

The BCM activates the front fog lamp relay
illuminating the front fog lamps when you select
ON. The front fog lamps remain illuminated for 5
seconds.

Body Control
Module

LF Turn
Lamp/DRL

The BCM activates the left front turn/DRL lamp
when you select ON. The left front turn/DRL lamp
remains activated until commanded OFF.

Body Control
Module

LR Stop/Turn
Signal Lamp

The BCM activates the left rear stop/turn signal
lamp and left turn indicator when you select ON.
The left rear stop/turn signal lamp and indicator
remain activated until commanded OFF.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

SCAN TOOL DATA LIST

Body Control Module (BCM)

Body Control
Module

RF Turn
Lamp/DRL

The BCM activates the right front turn/DRL lamp
when you select ON. The right front turn/DRL lamp
remains activated until commanded OFF.

Body Control
Module

RR Stop/Turn
Signal Lamp

The BCM activates the right rear stop/turn signal
lamp and right turn indicator when you select ON.
The right rear stop/turn signal lamp and indicator
remain activated until commanded OFF.

Body Control
Module

Inadvertent Power
1

The BCM disables the inadvertent power supply
circuit when you select OFF. The inadvertent power
supply circuit remains disabled for 5 seconds.

Scan Tool Parameter

Data List

Units Displayed

Typical Data

Value

Ignition ON/Engine OFF/Vehicle in PARK/Park Brake Released/Headlamps in

AUTO/All Doors Closed

Ambient Light Sensor

Data

Volts

1.75 Volts

Maximum Light to

4.9 Volts

Maximum Dark

Battery Voltage Signal

Data

Volts

Varies

Dimming Potentiometer

Data

Volts

Varies

Courtesy Lamp Switch

Inputs

Active/Inactive

Inactive

Dome Lamp Override Switch

Inputs

On/Off

Off

Driver Door Ajar Sw.

Inputs

Door Closed/Door

Ajar

Door Closed

Front Fog Lamp Switch

Inputs

Active/Inactive

Inactive

Front Wipers Active

Inputs

Yes/No

No

Hazard Lamp Switch

Inputs

Active/Inactive

Inactive

Headlamp On Switch

Inputs

Active/Inactive

Inactive

Headlamp Off Switch

Inputs

Active/Inactive

Inactive

High Beam Select Switch

Inputs

Active/Inactive

Inactive

Ignition 1 Run/Crank

Inputs

Active/Inactive

Active

Ignition Off/Run/Crank

Inputs

Active/Inactive

Active

Park Brake Switch

Inputs

Released/Applied

Released

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

SCAN TOOL DATA DEFINITIONS

Data

Battery Voltage Signal

The scan tool displays the battery system voltage received by the module.

Ambient Light Sensor

The scan tool displays the output voltage of the ambient light sensor based on the intensity
of light detected. As the light intensity increases, the sensor displayed voltage decreases. In
the LIGHT state, a low voltage, not less than 1.75 volts, is present and the DRL will be ON.
In the DARK state, a high voltage, up to 4.9 volts, is present and the headlamps will be ON.

Dimming Potentiometer

The scan tool displays the voltage value indicating the position of the I/P dimmer switch.

Park Lamp Switch

Inputs

On/Off

Off

Passenger Door Ajar Sw.

Inputs

Door Closed/Door

Ajar

Door Closed

Rear Fog Lamp Switch

Inputs

On/Off

Off

Courtesy Lamp Output

Outputs

On/Off

Off

DRL Status

Outputs

On/Off

Varies

Fog Lamp Relay Cmd.

Outputs

On/Off

Off

Headlamp Relay

Outputs

On/Off

Varies

High Beam Relay Command

Outputs

On/Off

Off

Inadvertent Power Cmd. 1

Outputs

On/Off

On

LF Turn/Hazard Lamp
Command

Outputs

On/Off

Off

LR Turn/Hazard Lamp
Command

Outputs

On/Off

Off

Park Lamps Signal

Outputs

On/Off

Varies

Rear Fog Lamp Relay Cmd.

Outputs

On/Off

Off

RF Turn/Hazard Lamp
Command

Outputs

On/Off

Off

RR Turn/Hazard Lamp
Command

Outputs

On/Off

Off

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3