Hummer H2. Manual - part 415

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - NAVIGATION SYSTEM

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

The identification of the control module(s) which command the system

The ability of the control module(s) to communicate through the serial data circuit

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 - NAVIGATION SYSTEM

Test Description

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

Connector Part Information

12064799

12-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A-D

Not Used

D-GN/WH

817

Vehicle Speed Signal

F-K

Not Used

OG/BK

2061

Navigation Mono Audio Signal (-)

PK/BK

2062

Navigation Mono Audio Signal (+)

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

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

3: Checks for DTCs for each module of the system.

4: 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 - Navigation System

SCAN TOOL DATA LIST

Radio

Step

Action

Yes

Schematic Reference: Navigation System Schematics

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

1. Turn ON the ignition, with

the engine off.

2. Attempt to establish

communication with the
navigation radio.

Does the scan tool communicate
with the control modules?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2 Device

in Data Link Communications

Select the display DTCs function
on the scan tool for the navigation
radio.
Does the scan tool display any
DTCs?

Go to Step 4

Go to Symptoms - Navigation

Systems

Does the scan tool display any
DTCs which begin with a "U"?

Go to Step 5

Go to Step 6

Does the scan tool display U2153?

Go to Diagnostic

Trouble Code (DTC)

List

Go to Scan Tool Does Not

Communicate with Class 2 Device

in Data Link Communications

Does the scan tool display DTC
B1000, B1004, B1007, or B1009?

Go to Diagnostic

Trouble Code (DTC)

List in Body Control

System

Go to Step 7

Does the scan tool display DTC
B1327 or B1328?

Go to Diagnostic

Trouble Code (DTC)

List in Engine Electrical

Go to Diagnostic Trouble Code

(DTC) List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Radio ON

8-Digit GM Part Number

ID Information

Numeric

Varies

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

SCAN TOOL DATA DEFINITIONS

8-Digit GM Part Number

The scan tool displays an 8 digit numeric number. The part number of the module.

Calibration ID

The scan tool displays 0-9999. The number designating what calibrations the module contains.

Julian Date of Build

The scan tool displays 0-999. The day of the year that the module was built.

New VIN Counter

The scan tool displays 0-99. The number of times a new VIN number has been set in the radio.

PROM ID

The scan tool displays 0-9999. The identification number of the modules internal PROM.

Signal Strength

The scan tool displays the strength of the received signal in dB.

Year Module Built

The scan tool displays a 1990- 2020, the production year the module was manufactured.

DIAGNOSTIC TROUBLE CODE (DTC) LIST

Diagnostic Trouble Code (DTC) List

DTC B0004

Calibration ID

ID Information

Numeric

Varies

Julian Date of Build

ID Information

Numeric

Varies

New VIN Counter

Data Display

Numeric

PROM ID

ID Information

Numeric

Varies

Signal Strength

Data Display

51 dB

Year Module Built

ID Information

Numeric

Varies

DTC

Diagnostic Procedure

Modules

B0004

DTC B0004

Navigation Radio

B2462

DTC B2462

Navigation Radio

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

Circuit Description

The navigation radio receives the vehicle speed signal from the PCM through a dedicated circuit shared with the
instrument cluster.

Conditions for Running the DTC

The navigation radio must detect a power mode transition to ON.

The radio does not set this DTC if B1327 or B1328 is current.

The vehicle must drive for 4 km (2.5 mi) after receiving a GPS signal.

Conditions for Setting the DTC

The navigation radio compares the vehicle speed signal from the PCM to the GPS location signal every second.
If the GPS signal indicates that the vehicle has traveled 4 km (2.5 mi) but no vehicle speed signal was received,
the radio sets the DTC.

Action Taken When the DTC Sets

The navigation radio uses the GPS signal when the vehicle speed signal from the PCM is unavailable.

The following symptoms may happen if the vehicle speed signal from the PCM is unavailable:

The vehicle icon may jump to different positions on the map screen.

The vehicle icon, current position marker may not move on the map screen while the vehicle is being
driven.

The route guidance accuracy may be degraded.

Conditions for Clearing the DTC

A current DTC clears when the navigation radio detects the vehicle speed signal from the PCM for more
than one second.

A history DTC clears after 50 ignition cycles without a vehicle speed signal failure.

Diagnostic Aids

An intermittent condition may be caused by the following:

Mis-routed harness

Rubbed through wire insulation

Broken wire inside the insulation

A loose connector pin

Test Description

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

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