NHTSA ID Number: 10241374
Manufacturer Communication Number: B840917
TSB/Document Date: 2023-08-28
Summary
While using the wireless charger, one or both of the following may occur: 1) The BMW
display key or mobile phone becomes hot to the touch, 2) The device switches off due to over temperature (built-in device protection).
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TSB/Document ID: B840917
Replacement Service Bulletin Number:
MFR Communication Date: 2023-07-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:ELECTRICAL
MFR Component System:
MFR Component Subsystem:
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7/28/23, 11:23 AM
84 09 17_DEVICE TEMPERATURE INCREASES WHEN USING WIRELESS CHARGER / CHARGING TRAY
SIB 84 09 17
DEVICE TEMPERATURE INCREASES WHEN USING WIRELESS
CHARGER / CHARGING TRAY
2023-07-04
This Service Information Bulletin (Revision 1) replaces TRI B84 09 17 dated November 2017.
This bulletin is information only, no claim information intended
What’s New (Specific text highlighted):
This Service Bulletin B84 09 17 replaces TRI B84 09 17. There is no content change.
MODEL
F44 (2 Series Gran
Coupe)
F93 (M8 Gran Coupe)
F98 (X4 M SAC)
G06 (X6 SAC)
G15 (8 Series Coupe)
G23 (4 Series
Convertible)
G42 (2 Series Coupe)
F90 (M5 Sedan)
F91 (M8 Convertible)
F92 (M8 Coupe)
F95 (X5 M Sports
Activity Vehicle (SAV))
G01 (X3 SAV)
G07 (X7 SAV)
F96 (X6 M Sports
Activity Coupe (SAC))
G02 (X4 SAC)
G12 (7 Series Sedan)
F97 (X3 M SAV)
G16 (8 Series Gran
Coupe)
G26 (4 Series Gran
Coupe)
G80 (M3 Sedan)
G20 (3 Series Sedan)
G05 (X5 SAV)
G14 (8 Series
Convertible)
G22 (4 Series Coupe)
G29 (Z4 Roadster)
G30 (5 Series Sedan)
G82 (M4 Coupe)
G83 (M4 Convertible)
Vehicles equipped with option code:
6NW – Wireless charger
SITUATION
While using the wireless charger, one or both of the following may occur:
1) The BMW display key or mobile phone becomes hot to the touch.
2) The device switches off due to over temperature (built-in device protection).
INFORMATION
Inductive charging of electronic devices is a process largely controlled by software on the electronic device
which conforms to the standard for wireless energy transmission Qi (pronounced tschi) specified by the
"Wireless Power Consortium".
The level and duration of the charge current is regulated by the device placed in the wireless charger.
A charging power of up to 5 watts is transmitted to the device. Charging power transmission loss results in
heat build-up. The greater the distance between the device and the wireless charger, the greater the
charging power loss will be. This results in a higher temperature in the device (possible overheating) and the
wireless charger.
Do not place non-wireless charging capable objects such as coins or keys etc. in the wireless charging
station.
Charging Termination
This process is terminated in one of two ways – charging cut-off or temperature cut-off.
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84 09 17_DEVICE TEMPERATURE INCREASES WHEN USING WIRELESS CHARGER / CHARGING TRAY
Charging cut-off is controlled by the charged device and is initiated when the battery is fully charged or
ambient conditions prevent further charging of the battery. This process usually involves a gradual decline of
the charging current to zero Watts power transfer.
Temperature cut-off can be initiated by either the charged device or the charging station. In either case, the
temperature within the initiating device has reached a threshold which the device has been programmed not
to exceed to prevent damage to itself.
Device Temperature
As electronic devices are inductively charged, their internal temperatures are elevated above the ambient
temperature of the charging environment. Additionally, electronic devices performing multiple tasks at the
same time (e.g. active telephone call and Spotify along with other Apps open in the background) may see
their internal temperatures rise.
Combinations of elevated ambient temperature in the environment (vehicle interior) in which they are being
charged and/or intensive use, may raise the internal temperature of the device above the threshold for safe
operation. This causes a protective shutdown of the device.
This situation most commonly occurs in devices being charged on the BMW wireless charging station when
the interior vehicle temperature is high and/or when engaging in extended-length Bluetooth communications
or using multiple applications like Spotify. The charging station may also implement a cut-off, but this is at a
temperature usually higher than when the device will have already shut off.
The following table lists some representative temperatures known to cause device shutoff and transfer of
temperature-related shutoff message to the charging station.
Device
BMW Display Key
Apple iPhone
Samsung smartphones
(vary widely)
Charging current
reduction
-97°F (36°C)
Some as high as
140°F (60°C)
Charging cut-off
Device shut-off
131°F (55°C)
-Some as low as 104°F
(40°C)
e.g.Samsung S8
140°F (60°C)
118°F (48°C)
--
Wireless Charger
Surface temp. 108°F
(42°C)
The table below provides the LED status description for the wireless charger
Blue
Orange
Red
Dark (unlit)
Device charging
Charger shut down due to device high temperature or coins etc.
Wireless Charger internal fault
Charger not used / Off
HINTS
For conditions that are similar to the situation described, go through the following steps to ensure the proper
identification of the source of the problem:
1. Check the charging arrangement for any of the following inefficiencies which lead to added heat
generation from not minimizing the distance between the device and the charger:
• Electronic device is not centered on the charger
• Extraneous items are preventing the electronic device from lying flat on the charger – coins, keys, etc.
Were any of these positional errors noted?
YES- Allow the device to cool, correct these errors and attempt to duplicate error condition before continuing
diagnosis.
NO- go to next step.
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2. Educate the customer about the parameters of device-induced temperature cut-off (including contribution
of ambient temperature of vehicle interior and intensive application use). No further repairs for this condition
are necessary.
QUESTIONS REGARDING THIS BULLETIN
Technical inquiries
Warranty inquiries
Parts inquiries
Submit feedback at the top of this bulletin
Submit an IDS ticket to the Warranty Department or use the chat available
in the Warranty Documentation Portal
Submit an IDS ticket to the Parts Department
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