Hello everyone,

I have a puzzling issue with my 2010 Audi A3 1.6 auto sport 8P. When I turn the ignition to the "on" position, most accessory systems like HVAC and lighting work fine. However, all four electric windows don't work, and the instrument cluster doesn't respond. I can only get a response from the cluster by pressing and holding the left button, which shows the time, date, and mileage, but no other info.

At first, I thought the instrument cluster was faulty, so I sent it to ECU testing in Derbyshire and paid £180 for a check and rebuild, but the problem persists. The cluster remains unresponsive (no dashboard lights, etc.).

When I try to start the car's engine, it briefly starts and then stops—seems like the immobilizer is preventing further operation.

Another issue is that I can't communicate with most modules using OBDeleven VAG pro. An autoscan shows issues with 2 modules:

Car: Audi A3
Year: 2010
Body type: Sportback
Engine: BSE

Engine Control Unit (01):

Active faults: 6
U0164 - Lost Communication With HVAC Control Module
U0146 - Lost Communication With Serial Data Gateway Module "A"
U0155 - Lost Communication With Instrument Panel Cluster (IPC) Control Module
U0447 - Invalid Data Received From Serial Data Gateway Module "A"
P0513 - Incorrect Immobilizer Key
P1652 - Read DTC memory of transmission CM
Transmission Control Unit (02):

Active faults: 8
P1867 - Databus drivetrain missing message of steering columns electron.
P1880 - Data bus missing message from Diagnostic Interface CM
P1862 - Databus drivetrain missing message from instrument cluster
P1880 - Data bus missing message from Diagnostic Interface CM
P1850 - Databus drivetrain Missing Message from Engine CM
U0235 - Lost Communication With Cruise Control Front Distance Range Sensor
P1852 - Databus drivetrain Implausible Message from Engine CM
U0103 - Lost Communication with Gear Shift Module

To troubleshoot, I'll try replacing the gateway with a second-hand unit with the same part and hardware numbers. If that doesn't work, I might have to send the engine ECU for a pricy check/rebuild at £240.

I've checked wires, fuses, and relays, and everything seems fine. I'm reaching out to see if anyone has insights or suggestions. I'm especially interested in testing the CAN-bus network more comprehensively.

Thanks for your help.

Take a look at this thread. A fellow members had a similar issue 5 days ago. 

https://www.audiownersclub.com/forums/topic/24553-bench-test-dash-cluster/

thank You for your advice !!!

No probs. Ide definitely advise you get the cluster bench tested orva diagnostic check to see if any fault codes flag up