Airbag DCU (Up To 2002 MY) (page 2 of 2)

RESTRAINT SYSTEMS

75-6

DESCRIPTION AND OPERATION

Power Back-up 
The airbag DCU incorporates capacitors to ensure the system will function if the external power supply is 
disconnected during a collision:

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Up to 2002 MY, the DCU incorporates a hardware capacitor, that provides power for 200 milliseconds to enable 
system operation and collision recording, and individual capacitors that provide power for 150 milliseconds for 
each fire signal output.

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From 2002 MY, the DCU incorporates individual capacitors that provide power for 150 milliseconds for each 
airbag fire signal output.

The capacitors are kept charged while the ignition is on by a dc-dc voltage converter incorporated into the airbag DCU. 
It can take up to 10 minutes from the ignition being switched off for the energy stored in the capacitors to fully dissipate 
and make the system inert.

Airbag DCU Connector Pin Details (Up To 2002 MY)

Airbag DCU Connector Pin Details (From 2002 MY)

Pin No.

Description

Input/Output

1

RH pretensioner (+ve)

Output

2

RH pretensioner (-ve)

Output

3

LH pretensioner (+ve)

Output

4

LH pretensioner (-ve)

Output

5

Power supply

Input

6

Vehicle earth

–

7

SRS warning lamp

Output

8

Not used

–

9

ISO 9141 K line

Input/Output

10

Driver airbag module (+ve)

Output

11

Driver's airbag module (-ve)

Output

12

Not used

-

13

Passenger's airbag (+ve)

Output

14

Passenger's airbag (-ve)

Output

15 to 30

Not used

-

Pin No.

Description

Input/Output

1 to 25

Not used

–

26

Ignition power supply

Input

27

SRS warning lamp

Output

28

Vehicle earth

–

29

Driver airbag module (–ve)

Output

30

Driver airbag module (+ve)

Output

31

Passenger's airbag (+ve)

Output

32

Passenger's airbag (–ve)

Output

33

LH pretensioner (–ve)

Output

34

LH pretensioner (+ve)

Output

35

RH pretensioner (–ve)

Output

36

RH pretensioner (+ve)

Output

37 to 53

Not used

–

54

ISO 9141 K line

Input/Output

55 to 75

Not used

–