FT - Function Test

WARNING: When performing Diagnostic Tests and repairs on components of the SRS system, store both airbags and side airbags with opening surface pointing upward. Do not expose to temperatures above 100° C and interrupt any electrical current from reaching the airbag unit.

Test Steps 1.0 & 2.0:

Function of the SRS MIL (A1e15):
- SRS system is fully functional, if the SRS MIL goes out after 4 seconds.
- SRS MIL goes out after 2 minutes, system fault noted, occupant protection not affected.
Vehicle without side airbag:
- Low battery voltage
- SRS MIL
- Seat belt buckle latch (USA)

Vehicle with side airbag:
SRS system is fully functional, if SRS MIL goes out after approx. 4 - 20 seconds.
SRS MIL remains illuminated as long as the following faults are present:
- Low battery voltage
- SRS MIL
- Communication fault in the side bag sensors
- Seat belt buckle latch (USA)
- Seat occupation recognition

- SRS MIL remains illuminated continuously, which may result in a non-deployment or a possible false airbag deployment.
- SRS MIL blinks after the replacement of the control module, the control module has not been programmed/parametered.

NOTE: SRS MIL illumination can only be erased via the HHT, if no current DTC's are stored in memory.

The following applies to vehicles which have the Automatic Child Seat Recognition (ACSR) system installed.

- Function of automatic child seat recognition warning lamp (E13, N72e1) (AIRBAG OFF):
If the "Babysafe" child seat Is installed:
The automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF) is illuminated and verifies the recognition of the "Babysafe" child seat.
The passenger-side airbag is turned off.
Side airbag and ETR remain in use.

- If the "Babysafe" child seat is NOT installed:
Automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF) goes out after approx. 4 seconds.
If the automatic child seat recognition warning lamp (N72e1) (AIRBAG OFF) does not go out after approx. 4 seconds, this indicates a fault in the ACSR system.

When turning on the vehicle illumination, the automatic child seat recognition warning lamp (N72e1) is dimmed as well.