Airbag Disable Switch

Airbag Disable Switch

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Nick_M

Original Poster:

16 posts

18 months

Monday 3rd October 2022
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The MasserGremlins have bitten me again !!!

The passenger seat airbag light illuminated at the weekend and won't go away. I tried switching the (child seat) airbag switch on and off several times (requires the ignition key into the key-slot on the passenger side of the dashboard; only visible with door open). Turning off the power isolation switch and no joy.
Next up was to remove the most common problem, the switch itself. These are really easy to get out; I used a trim-kit chisel to pry it partially open and then wiggled it free to reveal the twin cable connector. Careful use of a screwdriver would be fine.

Stripping it down is simple. Two screws on the end and two small catches on the connector lug. Inside is a connection plate with two SMD Resistors. I tested these - using the Ohm setting on a multimeter - and both were fine: 0.402 k Ohms (same as 402 Ohms) and 101.1 Ohms. The resistors are marked with 4020 and 1000 respectively. I will add more pictures :-)

So now I will have to move on to other areas of the system to try and find the fault. But thought it might help to save others the expense of buying a new switch; only find it doesn't solve the problem. The pictures will help :-)


Nick_M

Original Poster:

16 posts

18 months

Monday 3rd October 2022
quotequote all


Resistors

Nick_M

Original Poster:

16 posts

18 months

Monday 3rd October 2022
quotequote all




Readings from the two resistors; all good

Nick_M

Original Poster:

16 posts

18 months

Monday 3rd October 2022
quotequote all




The two screws that secure the base plate; allowing access to the circuit board. I tried to find the switch online; but whilst I could locate the manufacturer they do not advertise this part number :-(

Vimercati part No. 383310168