1990 C4 Dreaded Air bag lights
Thread Starter
Intermediate
Joined: Nov 2014
Posts: 49
Likes: 3
1990 C4 Dreaded Air bag lights
I have cleaned both sensors, I have no codes and I'm struggling to reset the air bag light. Help! I would live with it but in order to get a road worthy certificate here you can't have any warning lights on.
Safety Car
Joined: Jun 2010
Posts: 4,564
Likes: 1,676
The only way the SIR light is on is if you have a code. So currently you do have a code.
Are you following the procedure in the factory service manual to clear the codes? Ideally, you would have a Tech1 and use it to clear the codes.
Are you following the procedure in the factory service manual to clear the codes? Ideally, you would have a Tech1 and use it to clear the codes.
Intermediate
Joined: Jul 2019
Posts: 29
Likes: 4
From: UNITED KINGDOM
Hi, I have exactly the same issue, INFL REST lamp always on.
Can you explain exactly where this bad ground connection is located please, is it somewhere under the driver's seat, my C4 is also a 1990.
thanks!
Can you explain exactly where this bad ground connection is located please, is it somewhere under the driver's seat, my C4 is also a 1990.
thanks!
Thread Starter
Intermediate
Joined: Nov 2014
Posts: 49
Likes: 3
“Taking a
jumper wire hooked to terminal K, ground it to the seat frame, and count
one thousand one. one thousand two, one thousand three. Then unhook it
from ground, count one thousand one, one thousand two, one thousand three.
Then reground it once more, and count one thousand one, one thousand two,
one thousand three. The code will disappear, leaving only a code 12 if you
are successful. If not, retry it again and again. A friend of mine did it
10 times before it was successful. But, think of the money you would have
to pay a mechanic to do THIS!!! ( , this is where I had the most
trouble, until I got an email from Dan’s friend and late-model guru, Ed.
Here is the secret….With the ignition off. Place the jumper
wire in the K terminal and ground it to the seat frame…Switch the
ignition on and AS SOON as the light begins to flash, remove the jumper
from the frame and count 1001,1002,1003, Then reground it and hopefully
you will only see code 12’s flashing. I spent an hour yesterday doing it
wrong and tonight I got it the first try using Ed’s method. Anyway, on
with Dan’s instructions) The A/C condensor is what drops water on this
sensor, and causes the problem.”
