Hummer H2. Manual — part 693

Rear Window Defogger Grid Terminal Identification - C1

Rear Window Defogger Grid Terminal Identification - C2

6

D-GN/WH

636

Ambient Air Temperature Sensor Signal

7

BK/WH

1704

Low Reference

8

BK

1050

Ground

9

L-GN

24

Backup Lamp Supply Voltage

10-12

-

-

Not Used

13

BN

341

Ignition 3 Voltage

14-15

-

-

Not Used

16

PK

1691

Automatic Day/Night Mirror Low Reference

Connector Part Information

z

12059885

z

1-Way M Metri-Pack 480 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

PU

293

Rear Defog Element Supply Voltage

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - STATIONARY WINDOWS

For the inside rearview mirror with the automatic day-night feature, begin the diagnosis by reviewing the
system Description and Operation. Reviewing the Description and Operation information will help you
determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and
Operation information will also help you determine if the condition described by the customer is normal
operation. Refer to Symptoms - Stationary Windows in order to identify the correct procedure for diagnosing
the system and where the procedure is located.

For the rear window defogger, begin the diagnosis with the Diagnostic System Check - Defogger . The
Diagnostic System Check will provide the following information:

z

The identification of the control modules which command the system

z

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

z

The identification of any stored diagnostic trouble codes (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.

DIAGNOSTIC SYSTEM CHECK - DEFOGGER

Test Description

Connector Part Information

z

12059885

z

1-Way M Metri-Pack 480 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

1450

Ground

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

The numbers below refer to the step numbers on the diagnostic table.

2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit. The
specified procedure will determine the particular condition.

4: The Symptom Table will determine the correct diagnostic procedure to use.

5: The presence of DTCs which begin with "U" indicate some other module is not communicating. The
specified procedure will compile all the available information before tests are performed.

Diagnostic System Check - Defogger

Step

Action

Yes

No

1

Install a scan tool.
Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does

Not Power Up in Data

Link Communications

2

1. Turn ON the ignition, with the engine OFF.

2. Attempt to establish communication with

the following:

z

HVAC Control Module

z

Body Control Module (BCM)

Does the scan tool communicate with the
modules?

Go to Step 3

Go to Scan Tool Does

Not Communicate

with Class 2 Device in

Data Link

Communications

3

1. Access the Class 2 Power Mode in the

Diagnostic Circuit Check on the scan tool.

2. Rotate the ignition switch through all

positions while observing the Class 2 Power
Mode on the Scan Tool. Refer to the Serial
Data Power Mode table within the Body
Control System Description and
Operation in Body Control System, for a
list of the power mode states that correspond
to each ignition switch position.

Does the Class 2 Power Mode parameter reading
match the ignition switch position for all the
selected positions?

IMPORTANT:

The engine may start during the following step.
Turn OFF the engine as soon as you have
observed the Crank power mode.

Go to Step 4

Go to Power Mode

Mismatch in Body

Control System

4

Select the display DTCs function on the scan tool
for the following modules.

z

HVAC Control Module.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

SCAN TOOL OUTPUT CONTROLS

Body Control Module (BCM)

SCAN TOOL DATA LIST

Body Control Module (BCM)

SCAN TOOL DATA DEFINITIONS

Body Control Module (BCM)

Rear Defog Relay

The scan tool displays On or Off. When the BCM energizes the RR DEFOG relay, the scan tool will
display On. When the BCM de-energizes the RR DEFOG relay, the scan tool will display Off.

DIAGNOSTIC TROUBLE CODE (DTC) LIST

Diagnostic Trouble Code (DTC) List

DTC B0283

z

BCM

Does the scan tool display any DTCs?

Go to Step 5

Go to Symptoms -

Stationary Windows

5

Does the scan tool display DTCs that begin with
"U"?

Go to Diagnostic

Trouble Code (DTC)

List in Data Link

Communications

Go to Step 6

6

Does the scan tool display DTC B1000 or B1440?

Go to Diagnostic

Trouble Code (DTC)

List in Body Control

System

Go to Diagnostic

Trouble Code (DTC)

List

Scan Tool

Output Control

Additional Menu

Selection(s)

Description

Rear Defogger

-

The BCM actuates the rear window defogger relay when you
select ON. The rear window defogger grid should become warm.

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition On/Engine Off

Rear Defog Relay

Outputs

On/Off

Off

DTC

Diagnostic Procedure

Module(s)

B0283

DTC B0283

BCM

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2