Hummer H3. Manual — part 29

Fig. 3: Charging
Courtesy of GENERAL MOTORS CORP.

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DTC

Description

DTC B1327

B1327: Device Voltage Circuit Low

DTC B1390

B1390: Device Voltage Reference Input 1 Circuit - GBCM

RVC VSENSE B+

DTC B1487

B1487: Generator L-Terminal Circuit Low - Turn On Signal

Circuit

DTC B1488

B1488: Generator L-Terminal Circuit High - Turn On Signal

Circuit

DTC B1492

B1492: Generator F-Terminal Circuit Low

DTC B1516

B1516: Battery Current Sensor Performance - GBCM

DTC B151B

B151B: Current Sensor Polarity Error - GBCM

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

DIAGNOSTIC STARTING POINT - ENGINE ELECTRICAL

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

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 diagnostic trouble codes (DTCs) and their status

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

DTC B1327

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B1327

Device Voltage Circuit Low

Diagnostic Fault Information

DTC B1566

B1566: Current Sensor Polarity Check - GBCM

DTC C0899

C0899: Device Voltage Low - EBCM

DTC C0901

C0901: Device 2 Voltage Low - EBCM

DTC P0562

P0562: System Voltage Low - ECM

DTC P0563

P0563: System Voltage High - ECM

DTC P0615

P0615: Starter Relay Control Circuit - PCM CNTRL Relay

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

B+

B1327

B1327

-

-

Ground

-

B1327

-

-

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

Circuit/System Description

The control modules on this vehicle monitor system voltage through the battery positive voltage
circuits. Damage to components, and incorrect data can occur when the voltage is out of range.
The following modules can set DTC B1327:

Digital radio receiver (DRR)

Radio

Vehicle communications interface module (VCIM)

Conditions for Running the DTC

The module has power and ground.

The ignition switch is not in START.

When the vehicle exits START, the module will delay checking the voltage for 2 seconds.

Conditions for Setting the DTC

The voltage is less than 9.5 volts for 1.2 seconds

Action Taken When the DTC Sets

A serial data message will be sent to notify all other modules of low battery voltage.

The module disables the setting of other DTCs.

Conditions for Clearing the DTC

The DTC will pass when the voltage is greater than 9.5 volts for 1.2 seconds.

A history DTC will clear after 50 consecutive ignition cycles, if the condition for the
malfunction is no longer present.

Diagnostic Aids

A high or low voltage DTC in multiple modules indicates a concern with the charging system.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

OnStar Schematics

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

Testing for Intermittent Conditions and Poor Connections

Circuit Testing

Wiring Repairs

Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Engine running, accessories OFF, measure and record the battery voltage at the battery

terminals. The voltage should be between 12.6 and 15.0 volts.

If not within the specified range, refer to Charging System Test.

2. Ignition OFF, disconnect the harness connectors at the appropriate module.

3. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 30

seconds. Test for less than 5 ohms between the ground circuit terminals and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

4. Verify that a test lamp illuminates between the B+ circuit terminals and ground.

If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.

5. If all circuits test normal, replace the appropriate module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the appropriate module replacement, setup, and programming.

2008 Hummer H3

2008 ENGINE Engine Electrical - H3