# Service bulletin L\-SB\-0019\-20

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10174925
- Published by NHTSA: 2020\-05\-11
- Manufacturer's number: L\-SB\-0019\-20
- Manufacturer's date: 2020\-04\-24
- NHTSA component: SUSPENSION

## NHTSA's summary

TSB: Some 2017 ? 2019 model year Lexus vehicles may exhibit one or more of the following conditions: ?Uneven temperature or air flow between the vents ?Little or no air flow from the vent\(s\) ?Improper MODE control function Some vehicles may also exhibit one or more of the following 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 ?B1445 ? Passenger Side Cool Air Bypass Damper Control ?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 ?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 Repair Procedure in this bulletin to address these conditions.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174925-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174925-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Suspension

## Trouble codes named

B1441, B1442, B1443, B1445, B1446, B1447, B1448, B1449, B1453, B1454, B1455, B1457, B1458, B1486, B1488

## Vehicles listed

- 2017 LEXUS GS 200T
- 2017 to 2019 LEXUS GS 350
- 2017 to 2019 LEXUS GS F
- 2017 to 2019 LEXUS GS HYBRID
- 2017 to 2019 LEXUS IS 300
- 2017 to 2019 LEXUS IS 350
- 2017 LEXUS IS200T
- 2017 to 2019 LEXUS LX570
- 2017 LEXUS RC 200T
- 2017 to 2019 LEXUS RC 300
- 2017 to 2019 LEXUS RC 350
- 2017 to 2019 LEXUS RC F

JSON: [/v1/bulletins/10174925](/v1/bulletins/10174925)

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