Chevrolet Trax: Brake warning indicator malfunction (WITH J41)
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
Diagnostic Fault Information
Circuit/System Description
The instrument cluster turns ON the brake warning indicator for 5 s after
ignition ON. The body control module
monitors the parking brake switch and the brake fluid level switch and will
request the instrument cluster via
serial data to turn the brake warning indicator ON when the parking brake is
applied or low brake fluid is
detected.
Reference Information
Schematic Reference
Hydraulic Brake Schematics (Encore), Hydraulic Brake Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Hydraulic Brake System Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that the brake fluid is above minimum level.
If low
Refer to Brake Fluid Loss.
If above minimum level
- Ignition ON.
- Verify the scan tool Brake Fluid Level Sensor is OK.
Refer to Circuit/System Testing - Brake Fluid Level Switch Malfunction.
- Verify the scan tool Park Brake Switch parameter changes between Applied
and Released while applying
and releasing the parking brake.
- If the parameter does not change
Refer to Circuit/System Testing - Park Brake Switch Malfunction.
- Verify the brake warning indicator turns ON and OFF, when commanding the
instrument cluster All
Indicators On and Off with a scan tool.
- If the brake warning indicator does not turn ON and OFF
Replace the P16 Instrument Cluster.
- If the brake warning indicator turns ON and OFF
- All OK.
Circuit/System Testing
NOTE: Circuit/System Verification must be performed before Circuit/System
Testing.
Brake Fluid Level Sensor Malfunction
- Ignition OFF and all vehicle systems OFF, disconnect the harness
connector at the B20 Brake Fluid Level
Switch. It may take up to 2 min for all vehicle systems to power down.
- Test for less than 10 ohms between the ground circuit terminal 2 and
ground.
If 10 ohms or greater
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
If less than 10 ohms
- Ignition ON.
- Verify the scan tool Brake Fluid Level Sensor parameter is Low.
If the parameter is not Low
- Ignition OFF, disconnect the harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal 1 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K9 Body Control Module.
If the parameter is Low
- Install a 3 A fused jumper wire between the signal circuit terminal 1
and ground.
- Verify the scan tool Brake Fluid Level Sensor parameter is OK.
If the parameter is Low
- Ignition OFF, disconnect the harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V.
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K9 Body Control Module
If the parameter is OK
- Test or replace the B20 Brake Fluid Level Switch.
Park Brake Switch Malfunction
- Ignition OFF, disconnect the harness connector at the B80 Park Brake
Switch.
- Verify that the B80 Park Brake Switch has no physical damage or
incorrect installation.
If physical damage or incorrect installation is found
Test or replace the B80 Park Brake Switch.
If the inspection is OK
- Ignition ON.
- Verify the scan tool Park Brake Switch parameter is Released.
If the parameter is Applied
- Ignition OFF, disconnect the harness connector at the K9 Body Control
Module.
- Test for infinite resistance between the signal circuit terminal A and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K9 Body Control Module.
If the parameter is Released
- Install a 3 A fused jumper wire between the signal circuit terminal A
and ground.
- Verify the scan tool Park Brake Switch parameter is Applied.
If the parameter is Released
- Ignition OFF, disconnect the harness connector at the K9 Body Control
Module, ignition ON.
- Test for less than 1 V between the signal circuit and ground
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V.
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace theK9 Body Control Module.
If the parameter is Applied
- Test or replace the B80 Park Brake Switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Brake Fluid Level Indicator Switch Replacement
- Parking Brake Indicator Switch Replacement
- Control Module References for body control module replacement,
programming and setup.
Brake pulsation
Brake Pulsation
BRAKE SYSTEM NOISE
Brake System Noise
READ NEXT:
Test Description
The number below refer to the step number on the diagnostic table:
5
Suspension components that are not operating properly may cause a disturbance
to the vehicle during
application o
Preliminary Inspections
Visually inspect easily accessible brake system components for obvious
damage and/or leaks which may
indicate that the vehicle should not be driven until further inspectio
Special Tools
CH-28662 Brake Pedal Effort Gauge
For equivalent regional tools, refer to Special Tools.
With the ignition OFF and the brakes cool, apply the brakes 3-5 times,
or until the brake ped
SEE MORE:
Removal Procedure
Support the radiator and condenser from above using the upper brackets
on each side.
Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle .
Remove the front tire and wheel assembly. Refer to Tire and Wheel
Removal and Installation .
Remove the drivetrain
Removal Procedure
Remove the front floor console. Refer to Front Floor Console Replacement
(Encore) , Front Floor
Console Replacement (Trax) .
Ensure that the park brake lever is in the fully released position.
Disconnect the electrical connector from the parking brake indicator
switch.