Hummer H3. Manual — part 1127

Diagnostic Aids

Recommended Action:

Correct F-Term short low condition.

Clear the codes.

Cycle the ignition.

If a fault condition persists, replace the module.

DTC B1492

IMPORTANT: You must cycle the ignition after clearing the DTC to turn OFF the

DIC message of Service Charging System.

IMPORTANT: You must cycle the ignition after clearing the DTC to turn OFF the

DIC message of Service Charging System and turn OFF the
battery indicator.

Step

Action

Values

Yes

No

Schematic Reference: Starting and Charging Schematics
Connector End View Reference: Engine Electrical Connector End Views

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System Check
- Vehicle

2

1. Start engine and idle.

2. With a scan tool, observe the

Generator F-Terminal Signal
parameter in the powertrain
control module (PCM) data
display.

Is the Generator F-Terminal Signal
data less than the specified value?

5%

Go to Step 3

Testing for
Intermittent
Conditions
and Poor
Connections

3

Disconnect the generator battery
control module harness connector
Is the Generator F-Terminal Signal
parameter still less than the

5%

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

DTC B1516

Circuit Description

The generator battery control module monitors its internal battery current sensor for many
charging system operations. When the values of the battery current sensor go out of range, DTC
B1516 will set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

specified value?

Go to Step 5 Go to Step 4

4

Inspect for poor connections at the
harness connector of the generator
battery control module. Refer to
Testing for Intermittent
Conditions and Poor Connections
and Connector Repairs .
Did you find and correct the
condition?

-

Go to Step 7 Go to Step 6

5

Repair the short to ground of the
generator field duty cycle control
circuit.
Did you find and correct the
condition?

-

Go to Step 7 Go to Step 6

6

Replace the generator battery
control module. Refer to Control
Module References for
replacement, setup and
programming.
Did you complete the replacement?

-

Go to Step 7

-

7

1. Use the scan tool in order to

clear the DTC.

2. Operate the vehicle within the

Conditions for Running the
DTC, as specified in the
supporting text.

Does the DTC reset?

-

Go to Step 2

System OK

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

DTC B1516 Battery Current Sensor Performance

Conditions for Running the DTC

Vehicle in RUN mode and Engine Run Flag is True.

This diagnostic shall be run every 50 ms.

Conditions for Setting the DTC

The duty cycle of the internal battery current sensor is less than 2 percent duty cycle or greater
than 98 percent duty cycle for greater than 240 seconds.

Action Taken When the DTC Sets

The filtered battery current is set to 0.1 amp.

The generator field control circuit duty cycle is set to 100 percent, battery voltage defaults
to 13.8 volts.

The generator battery control module will request the driver information center (DIC)
message of Service Charging System. The battery indicator remains OFF.

Conditions for Clearing the DTC

The duty cycle of the internal battery current sensor is greater than 2 percent duty cycle or less
than 98 percent duty cycle.

Diagnostic Aids

Recommended Action:

Clear the codes.

Cycle the ignition.

DTC B1516

IMPORTANT: You must cycle the ignition after clearing the DTC to turn OFF the

DIC message of Service Charging System.

Step

Action

Yes

No

Schematic Reference: Starting and Charging Schematics
Connector End View Reference: Engine Electrical Connector End Views

Did you perform the Diagnostic System
Check - Vehicle?

Go to
Diagnostic

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

DTC B1566

Circuit Description

The generator battery control module monitors its internal battery current sensor for many
charging system operations. When the polarity of the battery current is sensed, DTC B1566 will
set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1566 Current Sensor Polarity Check

Conditions for Running the DTC

Vehicle in RUN mode and Engine Run Flag is True.

This diagnostic shall be run every 50 ms.

Conditions for Setting the DTC

1

Go to Step 2

System Check -
Vehicle

2

1. Install a scan tool.

2. Clear DTC.

3. Cycle ignition.

Does DTC B1516 reset?

Go to Step 3

Go to Testing
for Intermittent
Conditions and
Poor
Connections

3

Replace the generator battery control
module. Refer to Control Module
References for replacement, setup and
programming.
Did you complete the replacement?

Go to Step 4

-

4

1. Use the scan tool in order to clear the

DTC.

2. Operate the vehicle within the

Conditions for Running the DTC, as
specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK

2007 Hummer H3

2007 ENGINE Engine Electrical - H3