Without Side Curtain Airbag

1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Without Side Curtain Airbag



Output Diagnostic Test Mode (DTM) (Function 03) (Vehicles Without Side Curtain Airbag)


NOTE:
- The Output Diagnostic Test Mode may only be performed with the vehicle stationary and the engine not running!
- Any malfunctions identified by the Output Diagnostic Test Mode must be traced and repaired.

The Output Diagnostic Test Mode activates the following components in the stated sequence:

Activation sequence
1 Warning lamp in fog taillight switch
2 Cause alarm to trigger
3 Power supply lead to ultrasonic sensors
4 Clock signal lead to ultrasonic sensors


NOTE: No "ATWS alarm " can be triggered via this output DTM test. To trigger a "ATWS alarm", perform an output DTM via control module for central locking or a function test.

- Starting interior monitoring system On Board Diagnostic (OBD).

Indicated on display:


Rapid data transfer HELP
Select function XX



- Enter "03" for the "Output Diagnostic Test Mode" function and confirm entry with Q key.

Indicated on display:


Output Diagnostic Test Mode ->
Control lamp for alarm system -K95



Warning lamp in fog taillight switch is actuated.

- Press -> key.

Indicated on display:


Output Diagnostic Test Mode ->
Cause alarm to trigger



Control module for ultra-sound sensors is sending an alarm signal to the control module for central locking for a signal test.

- Press -> key.

Indicated on display:


Output Diagnostic Test Mode ->
Power supply lead



The control module sends a constant voltage of 8 V; wire test.

- Press -> key.

Indicated on display:


Output Diagnostic Test Mode ->
Clock signal lead



The control module sends a constant voltage of 5 V; wire test.

- Press -> key.

Indicated on display:


Output Diagnostic Test Mode ->
End



- Press -> key.

Indicated on display (function selection):


Rapid data transfer HELP
Select function XX



Checking power supply lead

Special tools, testers and auxiliary items required







- V.A.G 1526 A

Test sequence
- Remove the two ultrasonic sensors.
- Detach connectors.
- Perform Output Diagnostic Test Mode and select control element test "Power supply lead".

Indicated on display:


Output Diagnostic Test Mode ->
Power supply lead



- Connect multimeter for voltage measurement between contacts 2 (positive) and 2 (Ground (GND)).
- Specification: 8 V
- Terminate Output Diagnostic Test Mode.
- Re-install ultrasonic sensors.

Checking clock signal lead

Special tools, testers and auxiliary items required







- V.A.G 1526A

Test sequence
- Remove the two ultrasonic sensors.
- Detach connectors.
- Perform Output Diagnostic Test Mode and select control element test "clock signal lead".

Indicated on display:


Output Diagnostic Test Mode ->
Clock signal lead



- Connect multimeter for voltage measurement between contacts 1 (positive) and 3 (Ground (GND)).
- Specification: 5 V
- Terminate Output Diagnostic Test Mode, Check DTC Memory and erase.
- Re-install ultrasonic sensors.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.