NHTSA ID Number: 11018520
Manufacturer Communication Number: B640525
TSB/Document Date: 2025-05-21
Summary
Customer states that the output air from one of the vehicle vent assemblies doesn’t match the desired temperature, nor change from Hot/Cold.
M 197
Indirect Air Distribution
Defrost Air Distribution
Please reference the FLAP diagram & STEPPER MOTOR control locations diagrams on the following pages.
2
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAPS / Kinematic Diagram Details (Overview)
7A
7B
3
13
1
6A
2
6B
4B
4A
5A
5B
8B
11
8A
10
12L
9
12R
3
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
Stepper Motor Control Locations Diagram (OVERVIEW)
#7- M20
KLAPPE_BELUEFTUNG_FA
#6- M197
Front Center Vent Air Distribution LEFT
KLAPPE_INDIREKTE_BELUEFTUNG
Indirect Air Distribution
#2- M23
KLAPPE_MISCHLUFT_FA
Front Temperature Mixing LEFT
#4- M7
KLAPPE_FUSS _BF
#3- M020
#1- M084
KULISSE_BELUEFTUNG_FUSS_HINTEN
KLAPPE_SEITEDUESE_FA
Front Side Vent Air Distribution LEFT
Front Footwell Air Distribution RIGHT
#5- M21
KLAPPE_FUSS_FA
Front Footwell Air Distribution LEFT
REAR Air Distribution
(LHD: Left Side VIEW)
4
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
Stepper Motor Control Locations Diagram (OVERVIEW)
#12- M22
KLAPPE_BELUEFTUNG_BF
Front Center Vent Air Distribution RIGHT
#9- M83
KLAPPE_MISCHLUFT_BF
Front Temperature Mixing RIGHT
#11- M022
#10- M61
KLAPPE_SEITENDUESE_BF
KLAPPE_DEFROST
Front Side Vent Air Distribution RIGHT
Defrost Air Distribution
#13- M16
KULISSE_FRISCHLUFT_UMLUFT
Fresh Air / Recirculated Air Distribution
#8- M024
KLAPPE_MISCHLUFT_HINTEN
REAR Temperature Mixing
(LHD: Right Side VIEW)
5
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #1: Fresh Air Flap
6
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #2: Recirculated Air Flaps x2 (connected)
TWO Push Pins!
7
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #1 & FLAP #2 Complete Kinematics Overview
1
Shared
Stepper
Motor
2
M 16
(13)
8
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #3: Defrost Air Flap
9
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #3 Kinematics Overview
3
M 61
(10)
10
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #4A/4B: Front Cold Temp. Mixing Flap Right (Mirrored Right to Left)
4B shown. #3 Defrost Air Flap removed from CAD image for easier visibility
TWO Push Pins (one on LEFT side flap & one on RIGHT side flap)!
11
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #4A/4B FLAP Kinematics Overview (Highlighted Yellow)
M 83
(9)
4B
4A
Shared
Stepper
Motor
Shared
Stepper
Motor
M 23
(2)
5B
5A
12
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #5A/5B: Front Warm Temp. Mixing Flap Right (Mirrored Right to Left)
5B shown. #7B Center vent air flap (Right) removed from CAD image for easier visibility.
A portion of inner housing also made transparent for easier visibility.
TWO Push Pins (one on LEFT side flap & one on RIGHT side flap)!
13
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #5A/5B FLAP Kinematics Overview (Highlighted Yellow)
M 83
(9)
4B
4A
Shared
Stepper
Motor
Shared
Stepper
Motor
M 23
(2)
5B
5A
14
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #6A/6B: Front Footwell Air Flap LEFT (Mirrored Left to Right)
6A shown.
TWO Push Pins (one on LEFT side flap & one on RIGHT side flap)!
15
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #6A/6B FLAP Kinematics Overview
6B
6A
M 21
(5)
M7
(4)
16
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #7A/7B: Front Center Vent Air Flap Right (Mirrored Right to Left)
7B shown.
TWO Push Pins (one on LEFT side flap & one on RIGHT side flap)!
17
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #7A/7B FLAP Kinematics Overview
M 22
(12)
7B
M 20
(7)
7A
18
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #8A/8B: Front Side Vent Air Flap LEFT (Mirrored Left to Right)
8A shown.
TWO Push Pins (one on LEFT side flap & one on RIGHT side flap)!
19
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #8A/8B FLAP Kinematics Overview
8A
8B
M 020
(3)
M 022
(11)
20
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #9: Rear Upper Vent Flap (Center Console)
21
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #9 Kinematics Overview (Highlighted Yellow)
12L
12R
M 084
(1)
9
Shared
Stepper
Motor
22
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #10: Rear Cold Temp. Mixing Flap
#9 Rear Upper Vent Flap (Center Console) removed from CAD image for easier visibility.
A Portion of large blue housing also removed for easier visibility.
A bad push-pin connection on Flap #10 can also affect Flap #11. Flap #11 is connected to Flap #10.
ONE Push Pin (RIGHT side only)!
23
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #10 Kinematics Overview (Highlighted Yellow)
Shared
Stepper
Motor
M 024
(8)
11
10
24
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #11: Rear Warm Temp. Mixing Flap
Flap #11
Flap #10
ONLY Flaps #10 & #11 (& kinematics & stepper motor) shown for visibility.
Flap #11 is connected to Flap #10.
Flap #11 does not have same push pin feature as other flaps.
A bad push-pin connection on Flap #10 can also affect flap #11.
Portion of housing removed
NO Push Pin on Flap #11 (Please see Flap #10)!
25
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #11 Kinematics Overview (Highlighted Yellow)
Shared
Stepper
Motor
M 024
(8)
11
10
26
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #12: Rear Footwell Air Flaps L/R x2 (connected)
ONE Push Pin (RIGHT side only)!
27
FLAP #12 Kinematics Overview (Highlighted Yellow)
12L
9
12R
M 084
(1)
Shared
Stepper
Motor
28
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
FLAP #13: Indirect Air Flap & Complete Kinematics Overview
13
M 197
(6)
ONLY Flap #13 (& kinematics & stepper motor) shown for visibility.
Flap #13 does not have same push pin feature as other flaps.
29
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
Push Pin Issue
30
G45 HVAC: Air Vent Flaps/Kinematic & Stepper Motor Master Info.
Push Pin Issue
31
- 💯【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...
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
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: B640525
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-15
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
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.
, Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- 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
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅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.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.