Instruction book AUDI A5 VERSION YEAR 2012
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 Audi A5/S5   Controls   Instruments and warning/indicator lamps  Warning and indicator lamps
If the indicator lamp flashes while the Audi A5 is in motion, the ESC or traction control system (ASR) is intervening.
If the indicator lamp lights up, the ESC system has been switched off for system reasons. In this case, the ESC can be reactivated by switching the ignition off and then on again. If the indicator lamp goes out, this means the system is fully functional.
If the indicator lamp lights up, the ESC system has been switched off via the OFF button.
Stabilisation control (ESC/ABS): fault! See owner's manual
If the indicator lamp and the ABS indicator lamp light up and the message appears, there is a malfunction in the anti-lock brake system or electronic differential lock. This will also cause an ESC malfunction. The Audi A5 can still be braked in the normal way (however the ABS control function will be out of action).
Drive to a qualified workshop without delay and have the fault rectified.
WARNING!
If the brake warning lamp lights up together with the ABS indicator lamp and the ESC indicator lamp, this can mean that the control function of the ABS is not working. As a result the rear wheels can lock relatively easily when braking. This could cause the tail of the Audi A5 to skid sideways. Drive carefully to the nearest qualified workshop and have the fault rectified.
Note
For more information about the ESC and ABS systems, refer to Link.
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