NHTSA ID Number: 10187252
Manufacturer Communication Number: L-SB-0002-21
TSB/Document Date: 2021-02-16
Summary
Some 2016 ? 2017 model year LX 570 vehicles may exhibit one or more 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 (Passenger Side). ?B1442 ? Air Inlet Damper Control Servo Motor Circuit. ?B1443 ? Air Outlet Damper Control Servo Motor Circuit. ?B1445 ? Passenger Side Cool Air Bypass Damper Control. ?B1446 ? Air Mix Damper Control Servo Motor Circuit (Driver Side). ?B1447 ? Rear Air Mix Damper Control Servo Motor Circuit (Driver Side). ?B1448 ? Passenger Side Face Servo Motor Circuit. ?B1449 ? Rear Air Outlet Damper Control Servo Motor Circuit. ?B1457 ? Driver Side Air Outlet Damper Control Servo Motor Circuit. ?B1458 ? Passenger Side Air Outlet Damper Control Servo Motor Circuit. ?B1486 ? Driver Side Air Outlet Damper Control Servo Motor Circuit. ?B1488 ? Rear Air Mix Damper Control Servo Motor Circuit (Front Passenger). Follow the procedures in this bulletin to address these conditions.
Draft - Confidential
© 2019 Lexus, a division of Toyota
Motor Sales, USA
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Page 28 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group A (Servo Replacement on the Vehicle) (continued)
M. Temporarily install the NEW damper servo sub-assembly by engaging the screw installing
holes of the damper servo sub-assembly side to the air conditioning radiator side in the order
of point 1 then point 2.
NOTE
Be careful NOT to move the levers on the air conditioning radiator side. If a link was moved, reset
the position of the link.
Figure 21.
A
B
z
z
1
2
z
1
1
z
2
z
A
Damper Servo Sub-assembly Side
1
Point 1
2
Point 2
B
z
z
Air Conditioning Radiator Side
N. Confirm each link pin is inserted into each corresponding link groove.
CAUTION
The link pins will be misaligned if the damper servo sub-assembly is installed
using force.
O. Install the damper servo sub-assembly with the four screws.
P. Reconnect the clamp and the two connectors.
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© 2019 Lexus, a division of Toyota Motor Sales, USA
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HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group A (Servo Replacement on the Vehicle) (continued)
Q. Reinstall the Certification ECU (smart key ECU assembly).
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Theft Deterrent/Keyless Entry –
“Theft Deterrent / Keyless Entry: Certification ECU: Installation”
R. Reinstall the No. 2 air duct sub-assembly.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Heating/Air Conditioning –
“Heating / Air Conditioning: Front Air Conditioning Unit: Installation”
S. Reinstall the No. 3 air duct sub-assembly.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Heating/Air Conditioning –
“Heating / Air Conditioning: Front Air Conditioning Unit: Installation”
T. Reinstall the heater to resistor duct assembly.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Heating/Air Conditioning –
“Heating / Air Conditioning: Front Air Conditioning Unit: Installation”
U. Reinstall the meter mirror sub-assembly (w/headup display).
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Meter/Gauge/Display –
“Meter / Gauge / Display: Headup Display: Installation”
Draft - Confidential
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 30 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group A (Servo Replacement on the Vehicle) (continued)
V. Reinstall the No. 1 heater to resistor duct sub-assembly.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Heating/Air Conditioning –
“Heating / Air Conditioning: Front Air Conditioning Unit: Installation”
W. Reinstall the center heater to resistor duct.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Heating/Air Conditioning –
“Heating / Air Conditioning: Front Air Conditioning Unit: Installation”
X. Is this the last servo being replaced?
Draft - Confidential
YES — Go to the appropriate completion procedure.
NO — Go to the next servo replacement procedure.
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 31 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group A (Servo Replacement on the Vehicle) (continued)
2. Remove the passenger side lower
[9] Air Mix Servo (F & R P).
A. Remove the instrument panel
safety pad assembly.
Figure 22.
Figure 23.
Refer to TIS, applicable model and
model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior
Panels/Trim – “Interior Panels /
Trim: Instrument Panel Safety
Pad: Removal”
B. Disconnect the connector, remove the
three screws and the air mix servo.
Figure 24.
NOTE
Reuse the attaching screws.
If a screw is lost, order the
following: 90099-00968.
Draft - Confidential
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 32 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group A (Servo Replacement on the Vehicle) (continued)
C. Mark and store the removed air mix servo in a separate container to avoid reinstalling it
in error.
D. Install the NEW passenger side lower
air mix servo (F & R P) by aligning the
lever with the mark on the air
conditioning radiator side.
Figure 25.
1
NOTE
Do NOT wipe off the grease in
the groove.
E. Install the NEW passenger side lower
air mix servo (F & R P) three screws
and reconnect the connector.
2
1
Mark
2
Do Not Wipe the Grease
Figure 26.
STOP
Confirm the link pin is inserted into
the link groove.
F. Is this the last servo being replaced?
YES — Go to the appropriate completion procedure.
NO — Go to the next servo replacement procedure.
Draft - Confidential
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 33 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle)
[11] Replace Air Outlet Servo (Rr D)
[12] Replace Rear Air Mix Servo (P)
NOTE
If there are currently servos requiring replacement that are BOTH in group B and in group D, perform
the rear cooling unit removal steps from group D (page 62) first, then follow the servo replacement steps
from group B to replace the group B servo. Replace ALL group B servos BEFORE reinstalling the rear
cooling unit.
1. Remove the [11] air outlet servo (Rr D).
A. Remove the rear No. 2
seat assembly LH.
Figure 27.
Figure 28.
Refer to TIS, applicable model
and model year Repair Manual:
Draft - Confidential
2016 – 2017 LX 570:
Vehicle Interior – Seat –
“Seat: Rear No. 2 Seat
Assembly: Removal”
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 34 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle) (continued)
B. Remove the rear floor mat rear
support plate.
Figure 29.
Refer to TIS, applicable model and
model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior
Panels/Trim – “Interior Panels /
Trim: Roof Headlining: Removal”
C. Remove the rear step cover.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior Panels/Trim –
“Interior Panels / Trim: Roof Headlining: Removal”
D. Remove the rear door scuff plate LH.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior Panels / Trim –
“Interior Panels / Trim: Roof Headlining: Removal”
E. Remove the No. 1 luggage
compartment trim hook.
Figure 30.
Refer to TIS, applicable model and
model year Repair Manual:
Draft - Confidential
2016 – 2017 LX 570:
Vehicle Interior – Interior
Panels/Trim – “Interior Panels /
Trim: Roof Headlining: Removal”
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 35 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle) (continued)
F. Remove the front quarter trim panel
assembly LH.
Figure 31.
Refer to TIS, applicable model and
model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior
Panels/Trim – “Interior Panels /
Trim: Roof Headlining: Removal”
G. Remove the two screws and plate
cover from the air outlet servo (Rr D).
Figure 32.
NOTE
Reuse the attaching screws.
If a screw is lost, order the
following: 90099-00968.
H. Disengage the claw and remove
the plate.
Figure 33.
CAUTION
Do NOT raise the claws too much to
avoid breaking them. ONLY raise
them enough to disengage.
1
Claw
1
Draft - Confidential
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Page 36 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on Vehicle) (continued)
I.
Mark and store the removed plate in a separate container so as not to reinstall it in error.
J. Disconnect the connector, remove the
two screws and servo.
Figure 34.
NOTE
Reuse the attaching screws.
If a screw is lost, order the
following: 90099-00968.
K. Mark and store the removed air mix servo in a separate container to avoid reinstalling
it in error.
L. BEFORE you install the NEW air outlet (Rr D), turn the gear on the rear cooling unit side
clockwise fully.
CAUTION
If the servo is installed with the gear turned counterclockwise fully, the servo
malfunctions and it will be required to remove and install the servo again. Make sure to
install the servo after turning the gear clockwise fully.
Draft - Confidential
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 37 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle) (continued)
M. Align the NEW servo as show in the illustration.
Figure 35.
1
1
Match Marks
N. Install the two screws and reconnect the connector.
Draft - Confidential
© 2019 Lexus, a division of Toyota Motor Sales, USA
z
Page 38 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle) (continued)
O. Reinstall the plate cover with the
two screws.
Figure 36.
P. Is this the last servo being replaced?
YES — Go to the appropriate completion procedure.
NO — Go to the next servo replacement procedure.
Draft - Confidential
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 39 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle) (continued)
2. Remove the [12] rear air mix servo (P).
A. Remove the rear No. 2 seat
assembly LH.
Figure 37.
Figure 38.
Refer to TIS, applicable model and
model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Seat –
“Seat: Rear No. 2 Seat
Assembly: Removal”
B. Remove the rear floor mat rear
support plate.
Figure 39.
Refer to TIS, applicable model and
model year Repair Manual:
Draft - Confidential
2016 – 2017 LX 570:
Vehicle Interior – Interior
Panels/Trim – “Interior Panels /
Trim: Roof Headlining: Removal”
© 2019 Lexus, a division of Toyota Motor Sales, USA
Page 40 of 71
HVAC Servo Motor Malfunction
Damper Servo Sub-assembly Replacement Procedure (continued)
Replacement Procedure Group B (Servo Replacement on the Vehicle) (continued)
C. Remove the rear step cover.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior Panels/Trim –
“Interior Panels / Trim: Roof Headlining: Removal”
D. Remove the rear door scuff plate LH.
Refer to TIS, applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Vehicle Interior – Interior Panels/Trim –
“Interior Panels / Trim: Roof Headlining: Removal”
E. Remove the rear door scuff plate LH.
Refer to TIS, applicable model and
model year Repair Manual:
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TSB/Document ID: L-SB-0002-21
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:
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