Mr-fix: Mr-fix moved page Audi Q7 4L long coding research to Audi Q7 4L Climatronic long coding research

2025-02-25T19:20:25Z

Mr-fix moved page Audi Q7 4L long coding research to Audi Q7 4L Climatronic long coding research

← Older revision	Revision as of 21:20, 25 February 2025
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Mr-fix: Created page with "There are no labels for LongCoding in module J255 - Climatronic for Audi Q7 4L. Let's try to figure it out. == Known car == Here's and original coding from a car that I have available: `01 04 80 18`. It's a 2014 Audi Q7 4L, facelift, 4-zone climate control, 4.2TDI 8-cylinder engine, LHD, EU spec. == Data from other cars == Browsing through the internet forums I found couple VCDS scans which should be helpfull. 01 00 94 16 - someone on YT Q7, d??..."

2025-02-25T18:02:54Z

Created page with "There are no labels for LongCoding in module J255 - Climatronic for Audi Q7 4L. Let's try to figure it out. == Known car == Here's and original coding from a car that I have available: <code>01 04 80 18</code>. It's a 2014 Audi Q7 4L, facelift, 4-zone climate control, 4.2TDI 8-cylinder engine, LHD, EU spec. == Data from other cars == Browsing through the internet forums I found couple VCDS scans which should be helpfull. 01 00 94 16 - someone on YT Q7, d??..."

New page

There are no labels for LongCoding in module J255 - Climatronic for Audi Q7 4L. Let's try to figure it out.

== Known car ==
Here's and original coding from a car that I have available: <code>01 04 80 18</code>.

It's a 2014 Audi Q7 4L, facelift, 4-zone climate control, 4.2TDI 8-cylinder engine, LHD, EU spec.

== Data from other cars ==
Browsing through the internet forums I found couple VCDS scans which should be helpfull.

01 00 94 16 - someone on YT Q7, d?????, 6???, RHD
01 00 9C 16 - someone on elektroda Q7, diesel, 6cyl, RHD
01 00 94 16 - VCDS UK Q7, diesel, 6cyl, RHD
01 01 35 12 - VCDS UK Q7, diesel, 6cyl, RHD
01 04 94 16 - VCDS UK Q7, diesel, 6cyl, RHD
01 00 9C 16 - VCDS UK Q7, diesel, 6cyl, RHD
01 00 94 16 - VCDS UK Q7, diesel, 6cyl, RHD
01 00 84 58 - VCDS New Zealand Q7, diesel, 8cyl, LHD
01 04 80 18 - Tata Q7, diesel, 8cyl, LHD
01 00 90 16 - forum VCDS Finlandia Q7, diesel, 6cyl, LHD
01 00 98 16 - VCDS Iceland Q7, diesel, 6cyl, LHD
03 04 A0 36 - forum VCDS USA Q7, diesel, 6cyl, LHD
03 04 A0 36 - forum VCDS USA Q7, diesel, 6cyl, LHD
03 02 A0 36 - VCDS USA Q7, diesel, 6cyl, LHD
03 04 A0 36 - VCDS USA Q7, diesel, 6cyl, LHD
00 04 A0 36 - VCDS USA Q7, diesel, 6cyl, LHD
00 0C C0 26 - VCDS USA Q7, petrol, 6cyl, LHD
00 08 C0 46 - VCDS USA Q7, petrol, 6cyl, LHD
00 0C C0 26 - VCDS USA Q7, petrol, 6cyl, LHD

== Looking for pattern ==
=== Diesel vs Petrol ===
It looks like all diesel cars have <code>Byte 03 → bit 4</code> set to <code>1</code>.

=== Cylinder count ===
With bunch of 6 and 8 cylinder engines, we can clearly see that <code>Byte 3 → bit 0-3</code> stores the cylinder count.

=== Region ===
Looks like there's some corelation between <code>Byte 00 → bits 0-3</code> and region. It might be the whole <code>Byte 00</code> - who knows.

=== LHD/RHD ===
Some cars were from UK, which means those are most likely to be coded for RHD config. Climatronic needs this to know which control knob is for driver.

We have a good candidate for this config - <code>Byte 02 → bit 2</code>. Looks like RHD vehicles will have this bit enabled.

=== Webasto / Aux Heater ===
I know that the Webasto Parking/Aux heater/ventilation controls for MMI can be coded in <code>Byte 02 → bit 3</code>.

== Summary ==
Byte 00 → bits 0-7 → Region (00=?; 01=Europe; 03=USA)
Byte 02 → bit 2 → LHD/RHD
Byte 02 → bit 3 → Aux Heat./Vent. controls on MMI
Byte 03 → bits 0-3 → cylinder count
Byte 03 → bit 4 → isDiesel

Audi Q7 4L Climatronic long coding research - Revision history

Mr-fix: Mr-fix moved page Audi Q7 4L long coding research to Audi Q7 4L Climatronic long coding research