Hummer H3. Manual — part 1307

The Stability Caution indicator turns ON.

The driver information center (DIC) displays the SERVICE STAB SYS message.

The DIC displays the TRAC FAILED messages.

Conditions for Clearing the DTC

The condition for the DTC is no longer present.

The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.

Reference Information

Schematic Reference

Hydraulic Brake Schematics

Connector End View Reference

Hydraulic Brake Connector End Views

Description and Operation

Brake Warning System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Circuit/System Verification

Ignition ON, observe the scan tool EBCM Brake Fluid parameter. The parameter should display
OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the brake fluid level switch.

2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 1

and ground.

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

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

3. Ignition ON, verify the scan tool EBCM Brake Fluid parameter is OK.

If not the specified value, test the signal circuit terminal 2 for a short to ground. If the
circuit tests normal, replace the EBCM.

4. Install a 3A fused jumper wire between the signal circuit terminal 2 and the ground circuit

terminal 1. Verify the scan tool EBCM Brake Fluid parameter is Low.

If not the specified value, test the signal circuit for a short to voltage or an open/high
resistance. If the circuit tests normal, replace the EBCM.

5. If all circuits test normal, test or replace the brake fluid level switch.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming

DTC C0267

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 C0267

Low Brake Fluid Indicated

Diagnostic Fault Information

DTC C0267

Circuit/System Description

Circuit

Short to

Ground

Open/High

Resistance

Short to
Voltage

Signal

Performance

Low Brake Fluid Signal
Circuit

C0267

C0130

-

-

Ground

-

C0130

C0130

-

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

The electronic brake control module (EBCM) monitors the brake fluid level switch via the brake
fluid level sensor signal circuit. With the switch closed, the signal circuit is pulled to ground
indicating low fluid level. When low fluid level is seen, the EBCM will send a serial data
message to the IPC illuminating the red brake warning indicator. The body control module
(BCM) monitors the park brake switch via the park brake switch signal circuit. With the park
brake applied, the switch is closed and the signal circuit is grounded. The BCM will then send a
serial data message to the IPC requesting the red brake warning indicator be illuminated.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The EBCM detects low brake fluid.

Action Taken When the DTC Sets

The EBCM disables the traction control system (TCS)/dynamic rear proportion
(DRP)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.

The Brake Warning indicator turns ON.

The driver information center (DIC) displays the BRAKE SYSTEM/SERVICE
TRACTION messages.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.

Reference Information

Schematic Reference

Hydraulic Brake Schematics

Connector End View Reference

Hydraulic Brake Connector End Views

Description and Operation

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

Brake Warning System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Circuit/System Verification

1. Verify the brake fluid is at the proper level.

If the brake fluid is not at the proper level, refer to Brake Fluid Loss.

2. Verify the scan tool EBCM Brake Fluid parameter is OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the brake fluid level switch.

2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 1

and ground.

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

3. Ignition ON, verify the scan tool EBCM Brake Fluid parameter is OK.

If not the specified value, test the signal circuit terminal 2 for a short to ground. If the
circuit tests normal, replace the EBCM.

4. Install a 3A fused jumper wire between the signal circuit terminal 2 and the ground circuit

terminal 1. Verify the scan tool EBCM Brake Fluid parameter is Low.

If not the specified value, test the signal circuit for a short to voltage or an open/high
resistance. If the circuit tests normal, replace the EBCM.

5. If all circuits test normal, test or replace the brake fluid level switch.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming

SYMPTOMS - HYDRAULIC BRAKES

IMPORTANT: The following steps must be completed before using the symptom

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3