L-SB-0033-20

Service Bulletin Details

Public Details for: L-SB-0033-20

Tsb: some 2010 ? 2012 model year rx 450h vehicles may exhibit a condition where the brake, abs, and/or trac warning light(s) are on and/or a check vsc message displays. Diagnostic trouble codes (dtcs) C1391, C1252, C1256, or C1253 may be st

- 2012 - 2011 - 2010 -

Models from 2012

Models from 2011

Models from 2010

L-SB-0033-20
August 31, 2020
ABS Warning Light On
Service
Category
Brake
Section
Brake Control/Dynamic Control System
Market USA
Applicability
YEAR(S)
MODEL(S)
2010 - 2012
RX450H
ADDITIONAL INFORMATION
Introduction
Some 2010 – 2012 model year RX 450H vehicles may exhibit a condition where the brake, ABS,
and/or TRAC warning light(s) are on and/or a Check VSC message displays. Diagnostic Trouble
Codes (DTCs) C1391, C1252, C1256, or C1253 may be stored. This condition may be caused by
a small internal brake fluid leak inside the brake booster assembly with master cylinder. Follow
the Repair Procedure in this bulletin to address this condition.
Warranty Information
MODEL YEAR
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
2010 – 2012
BR1916
R & R Brake Actuator Assembly,
and
Brake Booster Pump Assembly
2.3
44050-48320
8C
99
APPLICABLE WARRANTY
 This repair is covered under the Lexus Basic Warranty. This warranty is in effect for 48 months
or 50,000 miles, whichever occurs first, from the vehicle’s in-service date.
 Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2020 Lexus, a division of Toyota Motor Sales, USA
Page 1 of 3
L-SB-0033-20
August 31, 2020
Page 2 of 3
ABS Warning Light On
Parts Information
PART NUMBER
MODEL YEAR
2010 – 2012
2010
PREVIOUS
NEW
44050-48320
04008-26448
47070-48060
44598-50010
04008-51248
47070-48020
44598-50010
04008-51148
PART NAME
QTY
Brake Actuator Assembly
1
1
Pump Kit, Brake Booster W/ Accumulator
1
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
PART NUMBER
Techstream ADVi*
Techstream 2.0
Techstream Lite
QTY
TSADVUNIT
TS2UNIT
ADE
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
 Only ONE of the Techstream units listed above is required.
 Software version 14.30.022 or later is required.
 Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
REQUIRED TOOLS & MATERIAL
PART NUMBER
QUANTITY
Toyota Dot 3 Brake Fluid
00475-1BF03
1 – 2 liters
© 2020 Lexus, a division of Toyota Motor Sales, USA
1
L-SB-0033-20
August 31, 2020
Page 3 of 3
ABS Warning Light On
Repair Procedure
Confirm the condition exists.
Is the brake, ABS, and/or TRAC warning light(s) ON and/or does a Check VSC
message display?

YES — Continue to step 2.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
Using Techstream, check for and record ANY stored DTCs.
Are ANY of the following DTCs stored: C1391, C1256, C1252, or C1253?

YES — Continue to step 3.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
Remove the brake actuator and brake booster pump.
Refer to TIS, applicable model and model year Repair Manual:

2010 / 2011 / 2012:
Brake – Brake Control/Dynamic Control System – “Brake Control / Dynamic Control
Systems: Brake Actuator: Removal”
Install the NEW brake actuator and brake booster pump.
Refer to TIS, applicable model and model year Repair Manual:

2010 / 2011 / 2012:
Brake – Brake Control/Dynamic Control System – “Brake Control / Dynamic Control
Systems: Brake Actuator: Installation”
Clear codes and test-drive the vehicle to ensure the condition is no longer present.
© 2020 Lexus, a division of Toyota Motor Sales, USA