NHTSA ID Number: 10132779
Manufacturer Communication Number: L-SB-0177-09 Rev
TSB/Document Date: 2018-04-02
Summary
TSB: Some RX 350 vehicles may exhibit a condition where the HVAC system intermittently blows warm air from the vents with the A/C ON. When this condition occurs, Diagnostic Trouble Code (DTC) B1479 (Flow Sensor Circuit) may also be stored in the A/C system as either a Current or History DTC. A malfunctioning A/C compressor flow sensor may cause this condition.
L-SB-0177-09
Rev2
November 25, 2009
Warm Air from HVAC Vents with A/C ON - DTC B1479
Service
Category
Vehicle Interior
Section
Heating/Air Conditioning
Market
USA
Applicability
YEAR(S)
MODEL(S)
2010 – 2011
RX350
ADDITIONAL INFORMATION
REVISION NOTICE
June 16, 2014 Rev2:
• The Warranty Information, Parts Information, and Required Tools & Equipment sections have
been updated.
May 25, 2011 Rev1:
• Applicability has been updated to include 2011 RX 350 vehicles.
• Production Change Information, Parts Information, and Repair Procedure sections have
been updated.
Any previous printed versions of this service bulletin should be discarded.
Introduction
Some RX 350 vehicles may exhibit a condition where the HVAC system intermittently blows warm
air from the vents with the A/C ON.
When this condition occurs, Diagnostic Trouble Code (DTC) B1479 (Flow Sensor Circuit) may also
be stored in the A/C system as either a Current or History DTC. A malfunctioning A/C compressor
flow sensor may cause this condition.
Follow the procedure outlined below to determine if this bulletin is applicable and to address
this condition.
© 2014 Lexus
, a division of Toyota Motor Sales, USA
Page 1 of 6
Rev2
L-SB-0177-09
November 25, 2009
Page 2 of 6
Warm Air from HVAC Vents with A/C ON - DTC B1479
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
PLANT
MODEL
TMK Line 1
RX 350
TMK Line 2
TMMC
DRIVETRAIN
PRODUCTION CHANGE EFFECTIVE VIN
2WD
JTJZK1BA#B2003225
4WD
JTJBK1BA#B2011582
2WD
JTJZK1BA#B2411364
4WD
JTJBK1BA#B2433829
2WD
2T2ZK1BA#BC048289
4WD
2T2BK1BA#BC092600
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
883401
R & R Compressor with Magnetic
Clutch Assembly
3.0
88320-48170
88320-48220
88410-48100
7A
54
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.
Parts Information
PART NUMBER
PART NAME
QTY
88320-48280
Compressor Assembly, Cooler
1
88410-33180
Clutch Assembly, Magnet
1
PREVIOUS
NEW
88320-48170
88320-48220
88410-48100
© 2014 Lexus, a division of Toyota Motor Sales, USA
L-SB-0177-09
Rev2
November 25, 2009
Page 3 of 6
Warm Air from HVAC Vents with A/C ON - DTC B1479
Required Tools & Equipment
REQUIRED EQUIPMENT
PART NUMBER
SUPPLIER
Techstream 2.0*
TIS Techstream
Techstream Lite
QTY
TS2UNIT
1
TSPKG1
ADE
TSLITEDLR01
–
R-134a Refrigerant Recovery/Recycling Machine
1
* Essential SST.
NOTE
• Only ONE of the Techstream units listed above is required.
• Software version 9.10.037 or later is required.
• Additional Techstream units or refrigerant service equipment may be ordered by calling
Approved Dealer Equipment (ADE) at 1-800-368-6787.
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
Plastic Pry Tool Kit*
00002-06020-02
1
* Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-933-8335.
© 2014 Lexus, a division of Toyota Motor Sales, USA
L-SB-0177-09
Rev2
November 25, 2009
Page 4 of 6
Warm Air from HVAC Vents with A/C ON - DTC B1479
Repair Procedure
1. Using Techstream, check for DTCs in the A/C system.
• If DTC B1479 is stored as a Current or History DTC, go to step 2.
• If DTC B1479 is NOT stored as Current or History, this bulletin does NOT apply.
Refer to the problem symptoms table of the Repair Manual.
Refer to the Technical Information System (TIS), applicable model year RX 350
Repair Manual:
• 2010 RX 350:
Vehicle Interior – Heating/Air Conditioning – “Heating/Air Conditioning: Air Conditioning
System: Problem Symptoms Table (to 8/2009)* / (from 8/2009)** ”
* Japan production vehicles (JTJ)
** North American Produced vehicles (2T)
• 2011 RX 350:
Vehicle Interior – Heating/Air Conditioning – “Heating/Air Conditioning: Air Conditioning
System: Problem Symptoms Table”
2. Using Techstream, inspect the flow sensor.
A. Enter the following menus:
Body Electrical / Air Conditioner / Data List
B. Check the “Flow Sensor” voltage.
(1) With the A/C OFF, and the voltage reading is LESS than 3.7 V, continue to step 3.
(2) With the A/C ON, and the voltage reading is MORE than 3.7 V, evacuate the A/C
system and verify refrigerant charge level.
• If the system is undercharged, recharge and see if DTC B1479 is able to be
duplicated using the Repair Manual diagnostic steps.
• If the system is fully charged, continue to step 3.
© 2014 Lexus, a division of Toyota Motor Sales, USA
Rev2
L-SB-0177-09
November 25, 2009
Page 5 of 6
Warm Air from HVAC Vents with A/C ON - DTC B1479
Repair Procedure (Continued)
3. Check the harness and connector (A/C compressor flow sensor – A/C amplifier).
A. Disconnect the A/C amplifier connector.
Figure 1. Front View of Wire Harness Connector
(to A/C Amplifier)
Figure 2. Front View of Wire Harness Connector
(to A/C Compressor [A/C Mass Flow Sensor])
F50
D1 0
3
1
1
2
2
3
1
FLOQ
1
S5FL
2
S5-1
2
SGFL
3
SG-2
3
QUFL
B. Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
F50-7 (FLOQ) - D10-3 (QUFL)
Always
Below 1 Ω
F50-13 (SG-2) - D10-2 (SGFL)
Always
Below 1 Ω
F50-30 (S5-1) - D10-1 (S5FL)
Always
Below 1 Ω
F50-7 (FLOQ) - Body Ground
Always
10 kΩ or Higher
F50-13 (SG-2) - Body Ground
Always
10 kΩ or Higher
F50-30 (S5-1) - Body Ground
Always
10 kΩ or Higher
• If any of the harness resistance tests fail, this bulletin does NOT apply.
Repair or replace the harness and go to step 5.
• If all tests are within specifications, proceed to step 4.
© 2014 Lexus, a division of Toyota Motor Sales, USA
L-SB-0177-09
Rev2
November 25, 2009
Page 6 of 6
Warm Air from HVAC Vents with A/C ON - DTC B1479
Repair Procedure (Continued)
4. Remove and replace the A/C compressor and clutch assembly.
Refer to TIS, applicable model year RX 350 Repair Manual:
• 2010 RX 350:
Vehicle Interior – Heating/Air Conditioning – “Heating/Air Conditioning: Compressor:
Removal (to 8/2009)* / (from 8/2009)** ”
• 2010 RX 350:
Vehicle Interior – Heating/Air Conditioning – “Heating/Air Conditioning: Compressor:
Installation (to 8/2009)* / (from 8/2009)** ”
* Japan production vehicles (JTJ)
** North American Produced vehicles (2T)
• 2011 RX 350:
Vehicle Interior – Heating/Air Conditioning – “Heating/Air Conditioning: Compressor:
Removal / Installation”
5. Clear all DTCs and confirm the A/C system has returned to proper operation.
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TSB/Document ID: L-SB-0177-09 Rev
Replacement Service Bulletin Number:
MFR Communication Date: 2014-06-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: BACK OVER PREVENTION
MFR Component System:
MFR Component Subsystem:
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