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.
L-SB-0001-21
January 11, 2021
HVAC Servo Motor Malfunction
Service
Category
Vehicle Interior
Section
Heating/Air Conditioning
Market USA
Applicability
YEAR(S)
MODEL(S)
2016 - 2017
GS F, GS200T, IS200T,
RC200T
2013 - 2017
GS350
2013 - 2017
GS450H
2014 - 2015
IS250
2016 - 2017
IS300, RC300
2014 - 2017
IS350
2015 - 2017
RC F
2015 - 2017
RC350
ADDITIONAL INFORMATION
© 2021 Lexus, a division of Toyota Motor Sales, USA
Page 1 of 77
L-SB-0001-21
January 11, 2021
Page 2 of 77
HVAC Servo Motor Malfunction
Introduction
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.
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 3 of 77
HVAC Servo Motor Malfunction
Operation Flowchart
Verify Vehicle Eligibility
1. Check the VIN range.
2. Check the TIS Vehicle Inquiry System.
Service Bulletin
Not Applicable
Continue diagnosis using the
applicable Repair Manual.
Initialize the servo motors
using Techstream.
Check for HVAC malfunctions and DTCs.
HVAC malfunctions and/or DTC present.
HVAC malfunctions present or ANY of the
following Servo-related DTCs present
•
•
•
•
•
B1441
B1443
B1447
B1449
B1454
•
•
•
•
•
B1442
B1446
B1448
B1453
B1455
No HVAC malfunctions or
Servo-related DTCs present.
Repair according to the
Repair Manual
Repair completed.
Return the vehicle
to the customer.
HVAC malfunctions or
Servo-related DTCs present.
Reprogram the air conditioner
amplifier assembly.
Using the servo cleaning utility, clean the
servos and replace ANY servos as
indicated when completed.
Servo DTCs
present.
Replace servo(s).
No DTCs
present.
Check for DTCs.
No Servo DTCs present.
Campaign completed, return the vehicle
to the customer.
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 4 of 77
HVAC Servo Motor Malfunction
Procedures
Confirmation Procedure ...................................................................................................................... 14
Flash Reprogram Procedure ............................................................................................................... 15
Servo Cleaning Process Procedure .................................................................................................... 16
Damper Servo Sub-assembly Replacement Procedure
IS and RC Servo Location Guide................................................................................................... 20
GS Servo Location Guide .............................................................................................................. 23
Battery Disconnection ................................................................................................................... 26
Group A (Servo Replacement on Vehicle)
Group B (Servo Replacement on Vehicle)
[1] Air Mix Servo (D) – DTC B1446 (IS, RC, and GS) .............................................................. 31
[6] Cool A/M Servo (D) – DTC B1453 (IS, RC, and GS) .......................................................... 36
[8] A/O Servo (Rr D) – DTC B1449 (GS Only) ......................................................................... 41
Group C (Servos Replaced From A/C Unit Removed From Vehicle)
[2] Air Mix Servo (P) – DTC B1441 (IS, RC, and GS) .............................................................. 47
[9] Rear Air Mix Servo – DTC B1447 (GS Only) ...................................................................... 47
[7] Cool A/M Servo (P) – DTC B1454 (IS, RC, and GS) ........................................................... 53
[5] Air Inlet Damper Servo – DTC B1442 (IS, RC, and GS) ..................................................... 58
[3] Air Outlet Servo (D) – DTC B1443 (IS, RC, and GS)
[4] Air Outlet Servo (P) – DTC B1448 (GS Only) ..................................................................... 27
(1) With Lever Type (IS and RC)........................................................................................ 63
(2) Without Lever Type (GS) .............................................................................................. 70
[10] DEF A/O Servo (D) – DTC B1455 (IS, RC, and GS) ......................................................... 73
Completion Procedure ........................................................................................................................ 77
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 5 of 77
HVAC Servo Motor Malfunction
Production Change Information
This bulletin applies to the following vehicles:
All 2014 – 2015 IS250 vehicles.
2014 – 2017 IS200t, IS300, and IS350 vehicles produced BEFORE the Production Change
Effective VINs shown below.
2015 – 2017 RC200t, RC300, and RC350 vehicles produced BEFORE the Production Change
Effective VINs shown below.
2015 – 2017 RC F vehicles produced BEFORE the Production Change Effective VIN
shown below.
2013 – 2017 GS200t and GS 350 vehicles produced BEFORE the Production Change Effective
VINs shown below.
2013 – 2017 GS450h vehicles produced BEFORE the Production Change Effective VIN
shown below.
2016 – 2017 GS F vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL
DRIVETRAIN
FRAME TYPE
PRODUCTION CHANGE EFFECTIVE VIN
IS200t
2WD
ASE30L
JTHBA1D2#H5056884
IS300
AWD
GSE37L
JTHCM1D2#H5024594
2WD
GSE31L
JTHBE1D2#H5030855
AWD
GSE36L
JTHCE1D2#H5014302
ASC10L
JTHHA5BC#H5006941
GSC10L
JTHHE5BC#H5017147
GSC15L
JTHSE5BC#H5008146
RC300
GSC16L
JTHSM5BC#H5003560
RC F
USC10L
JTHHP5BC#H5006678
ARL10L
JTHBA1BL#HA005701
GRL12L
JTHBZ1BL#HA011922
GRL16L
JTHCZ1BL#HA007257
GWL10L
JTHBS1BL#HA002388
URL10L
JTHBP1BL#HA002488
IS350
RC200t
2WD
RC350
AWD
GS200t
2WD
GS350
AWD
GS450h
2WD
GS F
© 2021 Lexus, a division of Toyota Motor Sales, USA
L-SB-0001-21
January 11, 2021
Page 6 of 77
HVAC Servo Motor Malfunction
Warranty Information
Table 1. All Models – Inspection and Reprogramming
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
ZKL001
Reprogram and Redistribute Grease
0.7
88650-#####*
72
41
OFP
T1
T2
87106-#####*
72
41
Table 2. Servo Replacement on Vehicle
OP CODE
DESCRIPTION
MODEL
ZKL002
R & R Glove Compartment Door,
Air Conditioner Amplifier,
and One Servo
GS
ZKL003
ZKL004
ZKL005
ZKL006
R & R Driver Knee Airbag
and One Servo
R & R Driver Knee Airbag
and Two Servos
GROUP
TIME
A
1.4
1.3
IS / RC
GS
1.3
B
IS / RC
1.4
1.4
ZKL007
R & R Driver Knee Airbag
and Three Servos
1.5
ZKL008
R & R Glove Compartment Door,
Air Conditioner Amplifier, One
Servo, and
R & R Driver Knee Airbag
and One Servo
1.9
ZKL009
R & R Glove Compartment Door,
Air Conditioner Amplifier,
One Servo, and
R & R Driver Knee Airbag
and Two Servos
ZKL010
R & R Glove Compartment Door,
Air Conditioner Amplifier,
One Servo, and
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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:
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