NHTSA ID Number: 10187279
Manufacturer Communication Number: L-SB-0001-21
TSB/Document Date: 2021-02-16
Summary
TSB: Some 2013 ? 2017 model year Lexus vehicles may exhibit one of the following HVAC conditions. ?Uneven temperature or air flow between the vents ?Little or no air flow from the vent(s) ?Improper MODE control function Additionally, some vehicles may store one or more of the following HVAC servo Diagnostic Trouble Codes (DTCs). ?B1441 ? Air Mix Damper Control Servo Motor Circuit (Front Passenger Side Lower Air Mix) ?B1442 ? Air Inlet Damper Control Servo Motor Circuit ?B1443 ? Air Outlet Damper Control Servo Motor Circuit ?B1446 ? Air Mix Damper Control Servo Motor Circuit (Driver Side Lower Air Mix) ?B1447 ? Rear Air Mix Damper Control Servo Motor Circuit ?B1448 ? Passenger Side Face Servo Motor Circuit ?B1449 ? Rear Air Outlet Damper Control Servo Motor Circuit ?B1453 ? Driver Side Air Outlet Damper COOL Control Servo Motor Circuit ?B1454 ? Passenger Side Air Outlet Damper COOL Control Servo Motor Circuit ?B1455 ? Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit Follow the procedure in this bulletin to address this condition.
Disengage the claw and remove the
cover sub-assembly.
Figure 66.
NOTE
Do NOT discard the screws and the cover
sub-assembly as they will be reused.
1
c
1
Cover Sub-Assembly
© 2021 Lexus
, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 65 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Mark and store the removed servo and
lever in a separate container to avoid
reinstalling them in error.
Figure 67.
NOTE
Replace the heater air damper control
lever as it may become damaged during
removal (part number 87296-53010).
1
c
1
Install the NEW [3] air outlet servo (D)
(W/lever type) by turning the gear by
hand to align the match marks.
Lever
Figure 68.
NOTE
The mark on the air conditioning unit side
can be found at the inner part of the
housing surface.
1
c
1
Match Mark
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 66 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Align the peephole with the big
tooth of the gear attached to the
cover sub-assembly and temporarily
install the cover sub-assembly.
Figure 69.
1
c
Look through the peephole to confirm
that the big tooth is aligned with the
tooth-missed part of the gear, then
install the cover sub-assembly with
the three screws.
NOTE
The gear can be moved with ease if the
cover sub-assembly is installed at the
correct position.
2
1
Big Tooth
2
Peephole
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 67 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
For installation of the [3] air outlet servo (D) (W/lever type), align the tooth-missed part of
the gear with the mark, and position the two levers in between the two marks.
NOTE
The mark on the air conditioning unit side can be found at the inner part of the housing surface.
Be careful of the level positions as they may move due to the weight of the door.
Figure 70.
1
c
2
1
c
1
c
1
Mark
2
Hold
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 68 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Temporarily install the NEW [3] air
outlet servo (D) (W/lever type) while
adjusting the positions of the gear and
lever.
Figure 71.
Looking down from above, confirm that
the pins of the servo are inserted into
the holes of the two levers.
Install the NEW [3] air outlet servo (D)
(W/lever type) with the three screws.
Reconnect the connector.
Install the NEW heater air damper
control lever by engaging the end claws
into the cover sub-assembly and servo.
Figure 72.
NOTE
Make sure to install the lever into the
cover sub-assembly first, then into the
servo. The lever will be locked and will
NOT move if it is installed into the
servo first.
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 69 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Install the air conditoning unit.
Refer to TIS, applicable model and model year Repair Manual:
Vehicle Interior – Heating/Air Conditioning – “Heating / Air Conditioning:
Air Conditioning Unit: Installation”
IS200T: 2016 / 2017
IS250: 2014 / 2015
IS300: 2016 / 2017
IS350: 2014 / 2015 / 2016 / 2017
RC200T: 2016 / 2017
RC300: 2016 / 2017
RC350: 2015 / 2016 / 2017
RC F: 2015 / 2016 / 2017
Is this the last servo being replaced?
YES — Continue to the Completion Procedure.
NO — Go to the next servo replacement procedure.
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 70 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Figure 73. [3] Air Outlet Servo (D)
5. Remove the [3] air outlet servo (D) – DTC B1443 (W/O lever type) (GS ONLY).
Remove the air conditioning unit and
blower assembly from the vehicle
together as an assembly.
Figure 74.
Refer to TIS, applicable model and
model year Repair Manual:
Vehicle Interior –
Heating/Air Conditioning –
“Heating / Air Conditioning:
Air Conditioning Unit: Removal”
2
1
c
1
Air Conditioning Unit
2
Blower Assembly
GS200T: 2016 / 2017
GS350: 2013 / 2014 / 2015 / 2016 / 2017
GS450H: 2013 / 2014 / 2015 / 2016 / 2017
GS F: 2016 / 2017
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 71 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Disconnect the connector and remove
the three screws.
Figure 75.
NOTE
Reuse the screws. If a screw is missing,
order part number 90099-00968.
Mark and store the removed servo in a separate container to avoid reinstalling it in error.
Install the NEW [3] air outlet servo (D) (W/O lever type) by aligning the tooth-missed part
of the gear with the mark, and position the two levers in between the two marks.
NOTE
The mark on the air conditioning unit side can be found at the inner part of the
housing surface.
Be careful of the level positions as they may move due to the weight of the door.
Figure 76.
1
c
2
1
c
1
c
1
Mark
2
Hold
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 72 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Temporarily install the NEW [3] air
outlet servo (D) (W/O lever type) while
adjusting the positions of the gear
and lever.
Figure 77.
Looking down from above, confirm that
the pins of the servo are inserted into
the holes of the two levers.
Install the NEW servo with the
three screws.
Reconnect the connector.
Install the air conditioning unit.
Refer to TIS, applicable model and model year Repair Manual:
Vehicle Interior – Heating / Air Conditioning – “Heating / Air Conditioning: Air Conditioning
Unit: Installation”
GS200T: 2016 / 2017
GS350: 2013 / 2014 / 2015 / 2016 / 2017
GS450H: 2013 / 2014 / 2015 / 2016 / 2017
GS F: 2016 / 2017
Is this the last servo being replaced?
YES — Go to the Completion Procedure.
NO — Go to the next servo replacement procedure.
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 73 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Figure 78. [10] DEF A/O Servo (D)
6. Remove the [10] DEF A/O servo (D) – DTC B1455.
Remove the air conditioning unit and
blower assembly from the vehicle
together as an assembly.
Figure 79.
Refer to TIS, applicable model and
model year Repair Manual:
Vehicle Interior –
Heating/Air Conditioning –
“Heating / Air Conditioning:
Air Conditioning Unit: Removal”
2
1
c
1
Air Conditioning Unit
2
Blower Assembly
IS200T: 2016 / 2017
IS250: 2014 / 2015
IS300: 2016 / 2017
IS350: 2014 / 2015 / 2016 / 2017
RC200T: 2016 / 2017
RC300: 2016 / 2017
RC350: 2015 / 2016 / 2017
RC F: 2015 / 2016 / 2017
GS200T: 2016 / 2017
GS350: 2013 / 2014 / 2015 / 2016 / 2017
GS450H: 2013 / 2014 / 2015 / 2016 / 2017
GS F: 2016 / 2017
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 74 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Disconnect the connector and remove
the two screws.
Figure 80.
NOTE
Reuse the screws. If a screw is missing,
order part number 90099-00968.
Insert a screwdriver wrapped in
protective tape between the gap of the
servo and gear and remove the servo.
Figure 81.
NOTE
The gear remains on the air conditioning
unit side.
2
1
Insertion Point
2
Protective Tape
© 2021 Lexus, a division of Toyota Motor Sales, USA
1
c
L-SB-0001-21
January 11, 2021
Page 75 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Turn the gear by hand to remove it.
Figure 82.
Mark and store the removed servo and servo gear in a separate container to avoid
reinstalling them in error.
Install the NEW [10] DEF A/O servo
(D). Turn the gear by hand to line it up
with the mark on the air
conditioning unit.
Figure 83.
1
c
1
Mark
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 76 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Align the long teeth of the servo gear
with the teeth of the gear, and
temporarily install the NEW servo.
Figure 84.
1
c
Install the NEW servo with the two
screws and reconnect the connector.
2
1
Alignment Location
2
Long Teeth
Reinstall the air conditoning unit.
Refer to TIS, applicable model and model year Repair Manual:
Vehicle Interior – Heating/Air Conditioning – “Heating / Air Conditioning: Air Conditioning
Unit: Installation”
IS200T: 2016 / 2017
IS250: 2014 / 2015
IS300: 2016 / 2017
IS350: 2014 / 2015 / 2016 / 2017
RC200T: 2016 / 2017
RC300: 2016 / 2017
RC350: 2015 / 2016 / 2017
RC F: 2015 / 2016 / 2017
GS200T: 2016 / 2017
GS350: 2013 / 2014 / 2015 / 2016 / 2017
GS450H: 2013 / 2014 / 2015 / 2016 / 2017
GS F: 2016 / 2017
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 77 of 77
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group C (Servos Replaced From A/C Unit Removed From Vehicle) (continued)
Is this the last servo being replaced?
YES — Continue to the Completion Procedure.
NO — Go to the next servo replacement procedure.
Completion Procedure
1. Initialize the servo(s).
Refer to TIS, applicable model and model year Repair Manual:
Vehicle Interior – Heating/Air Conditioning – “Heating / Air Conditioning: Air Conditioning
System: Initialization”
IS200T: 2016 / 2017
IS250: 2014 / 2015
IS300: 2016 / 2017
IS350: 2014 / 2015 / 2016 / 2017
RC200T: 2016 / 2017
RC300: 2016 / 2017
RC350: 2015 / 2016 / 2017
RC F: 2015 / 2016 / 2017
GS200T: 2016 / 2017
GS350: 2013 / 2014 / 2015 / 2016 / 2017
GS450H: 2013 / 2014 / 2015 / 2016 / 2017
GS F: 2016 / 2017
2. Check for DTCs.
3. If the servo does NOT function correctly, replace it.
4. Restore the vehicle back to its assembled condition.
© 2021 Lexus, a division of Toyota Motor Sales, USA
- 💯【Conta.ct us for Support Directly】If you met any...
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW...
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS...
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full...
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE...
- 【TURN OFF CEL】 This AL319 car scanner diagnostic tool...
- 【EXTENSIVE APPLICATION】 Autel AL319 Compatible with...
- 【FOR END USER & DIYERS】 This error code reader AL319 is...
- 【USER-FRIENDLY DESIGN】 This OBD2 scanner and check...
- 【HIGH-QUALITY SERVICES】 12 months war.ranty from the...
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: L-SB-0001-21
Replacement Service Bulletin Number:
MFR Communication Date: 2021-01-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford, for Lincoln, and for Mazda ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
This product presentation was made with AAWP plugin.