0x05 BMBT Service Mode Request
GT 0x3b → BMBT 0xf0
This is only applicable to vehicles equipped with BMBT.
This command is seemingly to support the service mode functions of the BMBT.
The message exchange format appears to mirror that of the D-Bus.
Note: independent of automatic brighness adjustment when instrument backlighting (58G) is activated.
Related
0x06BMBT Service Mode Reply0x4fBMBT Monitor Control
Examples
3B 04 ED 05 00 D7
3B 04 F0 05 00 CA
3B 05 F0 05 0B 01 C1
3B 05 F0 05 40 01 8A
3B 06 F0 05 41 01 6C E4
3B 06 F0 05 42 01 D4 5F
Parameters
The message length will vary depending on use case.
| Parameter | Index | Length | Type |
|---|---|---|---|
| Property ID | 0 |
1 |
Bitfield? |
| Data | 1 |
-1 |
Various |
Property ID
| ID | Property |
|---|---|
0x00 |
Ident Request |
0x0b |
Key Function Request |
0x40 |
Brightness Request |
0x41 |
Brightness Set (BMBT?) |
0x42 |
Brightness Set (E85/6 Flip-Up/RCM?) |
Use Cases
Settings
Brightness (>=3-1/..)
Brightness control via the ‘Set’ menu.
Brightness was originally only adjustable via service mode, and not made available via ‘Set’ until a later build of the updated UI. As such, the use case effectively mirrors brightness adjustment via service mode.
When the user (first) opens the ‘Set’ menu, the GT will (lazily) request the current brightness value from the BMBT.
3B 05 F0 05 40 01 8A # Request brightness
F0 04 3B 06 18 D1 # Reply brightness
The GT then sets the Brightness level as per the value returned via 0x06.
As the user adjusts the brightness level (via 0x31):
# Note: both commands are send with each adjustment.
3B 06 F0 05 41 01 6C E4 # 0x41 appears to represent the BMBT.
3B 06 F0 05 42 01 6C E7 # 0x42 may represent the RCM, or E85/6 flip-up display.
The MK4 uses following brightness steps:
# Note: same encoding as via Service Mode
3B 06 F0 05 41 01 FF 77 # "Min"
3B 06 F0 05 41 01 EC 64
3B 06 F0 05 41 01 E0 68
3B 06 F0 05 41 01 D4 5C
3B 06 F0 05 41 01 C8 40
3B 06 F0 05 41 01 BC 34
3B 06 F0 05 41 01 B0 38
3B 06 F0 05 41 01 A4 2C
3B 06 F0 05 41 01 98 10
3B 06 F0 05 41 01 8C 04
3B 06 F0 05 41 01 80 08
3B 06 F0 05 41 01 0C 84
3B 06 F0 05 41 01 18 90
3B 06 F0 05 41 01 24 AC
3B 06 F0 05 41 01 30 B8
3B 06 F0 05 41 01 3C B4
3B 06 F0 05 41 01 48 C0
3B 06 F0 05 41 01 54 DC
3B 06 F0 05 41 01 60 E8
3B 06 F0 05 41 01 6C E4
3B 06 F0 05 41 01 7F F7 # "Max"
Service Mode: On-board Computer
BMBT service mode offers the following functions:
- Version
- Key function
- Brightness
Version
# "Version" => "ON-BOARD COMPUTER VERSION"
3B 04 ED 05 00 D7
Key Function
# "Key function" => "ON-BOARD MONITOR KEY FUNCT."
3B 05 F0 05 0B 01 C1
Brightness (“Contrast”)
# "Brightness" => "ON-BOARD COMPUTER CONTRAST"
3B 05 F0 05 40 01 8A
Note: if the brightness value already been lazily loaded via Set menu, then the GT will not send above the request.
As the user changes the brightness level via the slider:
# Note: same encoding as via 'Set'
3B 06 F0 05 41 01 FF 77 # -10
3B 06 F0 05 41 01 EC 64 # -9
3B 06 F0 05 41 01 E0 68 # -8
3B 06 F0 05 41 01 D4 5C # -7
3B 06 F0 05 41 01 C8 40 # -6
3B 06 F0 05 41 01 BC 34 # -5
3B 06 F0 05 41 01 B0 38 # -4
3B 06 F0 05 41 01 A4 2C # -3
3B 06 F0 05 41 01 98 10 # -2
3B 06 F0 05 41 01 8C 04 # -1
3B 06 F0 05 41 01 80 08 # 0
3B 06 F0 05 41 01 0C 84 # +1
3B 06 F0 05 41 01 18 90 # +2
3B 06 F0 05 41 01 24 AC # +3
3B 06 F0 05 41 01 30 B8 # +4
3B 06 F0 05 41 01 3C B4 # +5
3B 06 F0 05 41 01 48 C0 # +6
3B 06 F0 05 41 01 54 DC # +7
3B 06 F0 05 41 01 60 E8 # +8
3B 06 F0 05 41 01 6C E4 # +9
3B 06 F0 05 41 01 7F F7 # +10
Note: quick adjustment via the dial will ‘jump’ brightness levels.
When the user exits the slider, the GT will then send both 0x41 and 0x42, presumably setting the multiple displays to a uniform brightness level.
3B 06 F0 05 41 01 24 AC # BMBT?
3B 06 F0 05 42 01 24 AF # E85/6 Flip-Up or RCM?