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Self-diagnosis of airbag system BTU (Basic Triggering Unit) with and without side airbag
Summary of measured value blocks
Vehicles ä 1997:
Measured value block 001
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Indicated on display:
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Display value
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Designation
|
|
Read measured value block 1
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1111 1)
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1 = Airbag, driver's side
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1 2 3 4
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1111 1)
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2 = Airbag, passenger side
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1111 1)
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3 = belt tensioner, driver's side
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|
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1111 1)
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4 = belt tensioner, passenger's side
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1) Example.
Table of readouts
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1111
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Resistance OK
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1011
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Resistance too low
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0111
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Resistance too high
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1101
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Short to earth
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1110
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Short to positive
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Possible causes of fault and fault remedy => from page 01-13.
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Vehicles 1997 ä up to vehicles ä1999: Chassis no. 8D XA 200 000:
Measured value block 001
|
|
|---|
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Indicated on display:
|
Display value
|
Designation
|
|
Read measured value block 1
|
correct 1)
|
1 = Airbag, driver's side
|
|
1 2 3 4
|
correct 1)
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2 = Airbag, passenger side
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|
|
correct 1)
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3 = Belt tensioner, driver's side
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|
|
correct 1)
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4 = Belt tensioner, passenger's side
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1) Example.
Table of readouts
|
correct
|
Resistance OK
|
|
too low
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Resistance too low
|
|
too high
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Resistance too high
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|
to earth
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Short to earth
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to positive
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Short to positive
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Possible causes of fault and fault remedy => from page 01-13.
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Measured value block 002
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|
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Indicated on display:
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Display value
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Designation
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Read measured value block 2
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correct 1)
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1 = Rear belt tensioner, driver's side
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1 2 3
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correct 1)
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2 = Rear belt tensioner, passenger side
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|
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correct 1)
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3 = Rear belt tensioner, centre
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1) Example.
Table of readouts
|
correct
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Resistance OK
|
|
too low
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Resistance too low
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too high 2)
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Resistance too high
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|
to earth
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Short to earth
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to positive
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Short to positive
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2) Display also possible if no belt tensioner is present.
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Possible causes of fault and fault remedy => from page 01-13.
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Measured value block 004
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|
|---|
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Indicated on display:
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Display value
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Designation
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Read measured value block 4
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Belt: yes 1)
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1 = Rear seat belt check driver's side
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1 2 3
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Belt: yes 1)
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2 = Rear seat belt check passenger side
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Belt: yes 1)
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3 = Rear seat belt check (centre)
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1) Example.
Table of readouts
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Belt: yes
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|
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Belt: no
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|
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correct
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Resistance OK
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too low
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Resistance too low
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too high
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Resistance too high
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to earth
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Short to earth
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to positive
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Short to positive
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Possible causes of fault and fault remedy => from page 01-13.
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Measured value block 005
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Indicated on display:
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Display value
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Designation
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Read measured value block 5
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correct 1)
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1 = Igniter for front side airbag, driver' s side
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1 2 3 4
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correct 1)
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2 = Igniter for front side airbag, passenger's side
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|
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correct 1)
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3 = Igniter for rear side airbag, driver' s side
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|
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correct 1)
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4 = Igniter for rear side airbag, passenger's side
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1) Example.
Table of readouts
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correct
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Resistance OK
|
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too low
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Resistance too low
|
|
too high 2)
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Resistance too high
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to earth
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Short to earth
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to positive
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Short to positive
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2) This readout will also appear even if no rear side airbags are fitted.
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Possible causes of fault and fault remedy => from page 01-13.
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Vehicles 1999 ä from chassis no. 8D XA 200 001 onwards:
Measured value block 001
|
|
|---|
|
Indicated on display:
|
Display value
|
Designation
|
|
Read measured value block 1
|
correct 1)
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1 = Airbag, driver's side
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|
1 2 3 4
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correct 1)
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2 = Airbag, passenger's side
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|
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correct 1)
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3 = Belt tensioner, driver's side
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|
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correct 1)
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4 = Belt tensioner, passenger's side
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1) Example.
Table of readouts
|
correct
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Resistance OK
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|
too low
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Resistance too low
|
|
too high
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Resistance too high
|
|
to earth
|
Short to earth
|
|
to positive
|
Short to positive
|
|
Possible causes of fault and fault remedy => from page 01-13.
|
Measured value block 002
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|
|---|
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Indicated on display:
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Display value
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Designation
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Read measured value block 2
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correct 1)
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1 = Rear belt tensioner, driver's side
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1 2 3 4
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correct 1)
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2 = Rear belt tensioner, passenger's side
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|
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correct 1)
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3 = Rear belt tensioner, centre
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too high 1)
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4 = Disregard display zone
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1) Example.
Table of readouts
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correct
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Resistance OK
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too low
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Resistance too low
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too high 2)
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Resistance too high
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|
to earth
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Short to earth
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|
to positive
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Short to positive
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2) Display also possible if no belt tensioner is present.
|
Possible causes of fault and fault remedy => from page 01-13.
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Measured value block 004
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|
|---|
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Indicated on display:
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Display value
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Designation
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Read measured value block 4
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Belt: yes 1)
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1 = Rear seat belt check driver's side
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1 2 3
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Belt: yes 1)
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2 = Rear seat belt check passenger's side
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Belt: yes 1)
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3 = Rear seat belt check (centre)
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1) Example.
Table of readouts
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Belt: yes
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|
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Belt: no
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|
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correct
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Resistance OK
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too low
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Resistance too low
|
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too high
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Resistance too high
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to earth
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Short to earth
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to positive
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Short to positive
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Possible causes of fault and fault remedy => from page 01-13.
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Measured value block 006
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Indicated on display:
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Display value
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Designation
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Read measured value block 6
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correct 1)
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1 = Igniter for front side airbag, driver' s side
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1 2 3 4
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correct 1)
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2 = Igniter for front side airbag, passenger's side
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|
|
correct 1)
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3 = Igniter for rear side airbag, driver' s side
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|
|
correct 1)
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4 = Igniter for rear side airbag, passenger's side
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1) Example.
Table of readouts
|
correct
|
Resistance OK
|
|
too low
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Resistance too low
|
|
too high 2)
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Resistance too high
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to earth
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Short to earth
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to positive
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Short to positive
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2) This readout will also appear even if no rear side airbags are fitted.
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Possible causes of fault and fault remedy => from page 01-13.
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Measured value block 008
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Indicated on display:
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Display value
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Designation
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Read measured value block 8
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correct 1)
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1 = Igniter front side airbag, second stage, driver's side
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1 2 3 4
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correct 1)
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2 = Igniter for front side airbag, passenger's side
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correct 1)
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3 = Igniter for rear side airbag, driver' s side
|
|
|
correct 1)
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4 = Igniter for rear side airbag, passenger's side
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1) Example.
Table of readouts
|
correct
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Resistance OK
|
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too low
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Resistance too low
|
|
too high 2)
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Resistance too high
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to earth
|
Short to earth
|
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to positive
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Short to positive
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2) This display is also possible if no second stage or head airbag is present.
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Possible causes of fault and fault remedy => from page 01-13.
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