Hummer H3. Manual - part 1400

Schematic Reference: Fog Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views or Data
Communication Connector End Views

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

3. With a scan tool, command the rear

fog lamp relay ON and OFF.

Does the rear fog lamp relay turn ON and
OFF with each command?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

1. Turn OFF the ignition.

2. Remove the rear fog lamp relay.

Refer to Relay Replacement
(Attached to Wire Harness) or
Relay Replacement (Within an
Electrical Center) .

3. Turn ON the ignition, with the engine

OFF.

4. Connect a test lamp between the

ground circuit of the rear fog lamp
relay and the battery positive voltage
circuit of the rear fog lamp relay.

Does the test lamp illuminate?

Go to Step 4

Go to Step 10

1. Connect a test lamp between the

control circuit of the rear fog lamp
relay and the ground circuit of the
rear fog lamp relay.

2. With a scan tool, command the rear

fog lamp relay ON and OFF.

Does the test lamp turn ON and OFF with

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

each command?

Go to Step 8

Go to Step 5

Does the test lamp remain illuminated with
each command?

Go to Step 7

Go to Step 6

Test for a short to ground, an open or high
resistance in the rear fog lamp relay control
circuit and rear fog lamp switch indicator
control circuit. Refer to Circuit Testing
and Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 9

Test for a short to voltage in the rear fog
lamp relay control circuit and rear fog
lamp switch indicator control circuit. Refer
to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 9

Inspect for poor connections at the rear fog
lamp relay. Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 11

Inspect for poor connections at the harness
connector of the body control module
(BCM). Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 12

Repair the open or high resistance in the
ground circuit of the rear fog lamp relay.
Refer to Wiring Repairs .
Did you complete the repair?

Go to Step 13

Replace the rear fog lamp relay. Refer to
Relay Replacement (Attached to Wire
Harness) or Relay Replacement (Within
an Electrical Center) .
Did you complete the replacement?

Go to Step 13

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

Go to Step 13

1. Use the scan tool in order to clear the

DTCs.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

DTC B0527, B0528 OR B0529

Circuit Description

When the body control module (BCM) receives a right turn signal ON command from the turn
signal switch, the BCM will apply voltage to the right rear stop/turn lamp supply voltage circuit
and right turn signal lamps supply voltage circuit. The turn signal flasher is integrated within the
BCM and will flash both circuits simultaneously. The turn signal indicator is also illuminated
utilizing the right rear stop/turn lamp supply voltage circuit.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

DTC B0527 Right Turn Signal Circuit Low

DTC B0528 Right Turn Signal Circuit High

DTC B0529 Right Turn Signal Circuit Open

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

When the BCM receives a right turn signal command and the right rear stop/turn lamp
supply voltage circuit is open, shorted to ground or shorted to voltage

When the BCM receives a right turn signal command and the right turn signal lamps supply
voltage circuit is shorted to ground or shorted to voltage

Action Taken When the DTC Sets

The right front and/or right rear turn signals will not operate or will remain always ON.

Conditions for Clearing the MIL/DTC

This DTC will clear on current status after the condition for setting the fault is corrected.

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 ACCESSORIES & EQUIPMENT Lighting - H3

A history DTC will clear after 100 consecutive ignition cycles without a fault present.

History and current DTCs can be cleared using a scan tool.

Test Description

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

3: This step tests for supply voltage and ground at the inoperative bulb socket.

4: This step tests if battery positive voltage is constantly being applied to the supply voltage
circuit.

5: This step tests if a condition exists in the supply voltage circuit.

6: This step tests if a condition exists in the ground circuit.

12: After replacement of the instrument panel cluster (IPC), you must calibrate the new
cluster for proper operation.

14: After replacement of the BCM, you must calibrate the new module for proper
operation.

DTC B0527, B0528 or B0529

Step

Action

Yes

Schematic Reference: Fog Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views, Displays
and Gages Connector End Views or Data Communication Connector End Views

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

3. With a scan tool, command the

inoperative turn signal ON and OFF.

Does the inoperative turn signal operate
ON and OFF with each command?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

1. Turn OFF the ignition.

2. Remove the inoperative bulb. Refer to

Daytime Running Lamp Bulb

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

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