Canada - Brakes - Abnormal Noise When Brake Pedal Released

Bulletin
TSB3559

Issue Date
January 31, 2011

Market
Canada

Title
ABNORMAL NOISE WHEN BRAKE PEDAL RELEASED

Component
BRAKES

Models
'10-'11 Prius

INTRODUCTION:

Some 2010 Prius and early produced 2011 Prius vehicles may exhibit an abnormal noise when the brake pedal is released. The noise is typically heard when the vehicle is stopped. The ABS Actuator Skid Control Electronic Control Unit (ECU) calibration software has been revised to eliminate this noise.

See attached video for an example of the abnormal noise.






APPLICABILITY:

PRODUCTION CHANGE INFORMATION:







This TSB applies to vehicles produced BEFORE the Production Change Effective VIN shown.






WARRANTY INFORMATION:






CALIBRATION INFORMATION:






REQUIRED TOOLS & EQUIPMENT:

REPAIR PROCEDURE:

1. Confirm the abnormal (squawk/honk) noise when releasing the brake pedal.
2. Connect the GR8 Battery Diagnostic Station to the vehicle and turn it ON, then select Power Supply Mode.

NOTE
- The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
- For details on how to use the GR8 Battery Diagnostic Station, refer to the GR8 Battery Diagnostic Station Instruction Manual located on ETAS/TIS library > Tools > tools and equipment > GR8 Battery Diagnostic Station Instruction Manual.
- If the GR8 Battery Diagnostic Station is unavailable, the PSC Power Supply Charger / Maintainer (MID-PSC-550SKIT) may be used.

3. Verify the vehicle's applicability for recalibration.
A. Connect Techstream and establish a vehicle connection.







B. Click the Health Check button on the System Select tab (see Figure 1).







C. Choose Chassis ECU group in the Health Check dialog box.
D. Click Next.







E. Click Continue to view Health Check results.
F. Verify current Calibration ID as per the chart listed in Calibration Information Table.

4. Flash reprogram the ABS Actuator Skid Control Computer.
A. Place the car in the "IG-ON" mode (push the Power button twice when the car is OFF - DO NOT depress the brake pedal).
B. Reflash the ABS Actuator Skid Control Computer with the newly designed software (New Calibration ID), following the procedures outlined in TSB No. 2758, "Techstream ECU Flash Reprogramming Procedure". Please refer to the Calibration Information table in this TSB for the NEW Calibration ID.
C. After completing the ABS Actuator Skid Control Computer reflash, disconnect the GR8 Battery Diagnostic Station or PSC Power Supply Charger / Maintainer (MID-PSC-550SKIT).

5. Using Techstream, check for Diagnostic Trouble Codes (DTCs).

NOTE
If any Pending, Current, and/or History DTCs are set, troubleshoot according to the Repair Manual.

6. Depress the brake pedal while vehicle is stopped to confirm the abnormal noise has been eliminated.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.