Hummer H3. Manual — part 1650

indicate OFF?

Go to Step 3 Go to Step 4

3

Test the encoder channel circuit
that is indicating OFF on the
scan tool for a short to ground.
Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct the
condition?

-

Go to Step 9 Go to Step 8

4

With the ignition in the OFF
position, test the encoder low
reference circuit for a short to
ground. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the
condition?

-

Go to Step 9 Go to Step 5

5

1. Turn the ignition ON with

the engine OFF.

2. With the transfer case

connector still
disconnected, use the scan
tool to clear DTCs.

Does DTC C0329 reset?

-

Go to Step 8 Go to Step 6

6

1. Turn the ignition OFF.

2. Connect the transfer case

connector.

3. Turn the ignition ON, with

the engine OFF.

4. With the transfer case shift

control switch, command
the transfer case through all
of the modes.

5. Using a scan tool, check

DTCs.

Does DTC C0329 set?

-

Go to Step 7

Go to Testing
for Electrical
Intermittents

Replace the encoder motor.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

DTC C0359

Circuit Description

The 4WD low circuit is used to notify the powertrain control module (PCM) that the vehicle is in
4WD low range. The PCM supplies 12 volts to this circuit. The transfer case shift control module
grounds this circuit when the vehicle is in 4WD low range.

This DTC detects a short-to-ground, short-to-voltage or an open in the 4WD low circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0359 Four Wheel Drive Low Range (4WD low) Discrete Output Circuit Malfunction

Conditions for Running the DTC

The ignition is ON.

The system voltage is 9-18 volts.

Conditions for Setting the DTC

7

Refer to Transfer Case
Motor/Encoder Replacement.
Did you complete the repair?

-

Go to Step 9

-

8

Replace the transfer case shift
control module. Refer to
Control Module References
for replacement, setup and
programming.
Did you complete the repair?

-

Go to Step 9

-

9

1. Use the scan tool in order

to clear the DTCs.

2. Operate the vehicle within

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

Does the DTC set?

-

Go to Step 1

System OK

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

After the transfer case shift control module grounds the output, the 4WD low circuit and
reads back a high voltage, the DTC is set. The system will not attempt setting the DTC again
during that ignition cycle.

The transfer case shift control module reads back a high voltage when a low voltage is
expected on the 4WD low circuit.

Action Taken When the DTC Sets

The transmission shift points may be affected.

The SERVICE 4WD indicator will be latched on for the remainder of the current ignition
cycle.

Conditions for Clearing the DTC

The transfer case shift control module will clear the DTC if the condition for setting the
DTC is not currently present.

A history DTC will clear after 33 consecutive ignition cycles without a fault present.

History DTCs can be cleared using a scan tool.

Test Description

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

2: This step tests for proper reference voltage to the transfer case shift control module on the
4WD low circuit.

3: This step tests the 4WD Low circuit for a short-to-voltage.

4: This step tests the 4WD Low circuit for an open or high resistance.

5: This step repairs the 4WD Low circuit for a short-to-voltage.

DTC C0359

Step

Action

Values

Yes

No

Schematic Reference: Transfer Case Control Schematics
Connector End View Reference: Transfer Case Control Connector End Views

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

1. Turn the ignition OFF.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

2

2. Disconnect the transfer case

shift control module.

3. Turn the ignition ON, with the

engine OFF.

4. Measure the voltage between

the 4WD low circuit harness
and ground.

Is the voltage reading within the
specified values?

10-13.5 V

Go to Step 3 Go to Step 4

3

1. Disconnect the PCM.

2. Measure the voltage between

the 4WD Low circuit harness
and ground.

Is the voltage reading within the
specified value?

0 V

Go to Step 7 Go to Step 5

4

Test the 4WD low circuit for an
open, high resistance or short to
ground. Refer to Circuit Testing
and Wiring Repairs .
Did you find and correct the
condition?

-

Go to Step 8 Go to Step 6

5

Repair the 4WD low circuit for
short-to-voltage. Refer to Wiring
Repairs .
Did you find and correct the
condition?

-

Go to Step 8

-

6

Replace the PCM. Refer to Control
Module References for
replacement, setup and
programming.
Did you complete the repair?

-

Go to Step 8

-

7

Replace the transfer case shift
control module. Refer to Control
Module References for
replacement, setup and
programming.

-

-

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3