View RSS Feed

Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

SRS Warning Light 02

Rate this Entry


After finding the fuse #1 was blown,
measured the SRS power line resistance at the fuse block and
confirmed that there was no short circuit when the SRS unit was
not powered up.


Therefore, the short circuit is inside the SRS unit or
the combination of inside/outside of the unit that is
only generated once the unit is powered up.







So, before removing the SRS unit, I wanted to be 100% sure that
there is nothing wrong with the R & L dash sensors and the inflator.

Measured the resistance of the two dash sensors at
the yellow SRS connector and disconnected the cable real at
the steering column to eliminate any possibility of short circuit around
the steering area.



After all these investigation, finally came to a conclusion that
the short circuit is definitely inside the SRS unit so
time to remove it from the cabin.









I knew from my past experience that it’s not going to be fun removing
the SRS unit.

It’s under the A/C evaporator unit behind the audio head unit.


Honda uses red thread lock on all of the TRX bolts on SRS related parts including
the ones holding the actual inflator at the steering wheel.

The ones at the steering wheel are not too bad but
the four bolts holding the SRS unit to the floor are always the nightmare.


T30 bolts with thread lock nearly 20 years old......


You can’t use impact driver as it has shock sensor inside the SRS unit and
even using the T-wrench, I always struggle not to damage the T30 recess.

On top of this, the welding holding the mating thread/insert at the left side of
the floor is so easy to come off and last few times,
I had to hold at least one of them with the vice grip.









Even after using several know-how, took long time to
remove these four bolts (only two shown in the above photo) but finally,
the SRS unit came off.











Opened the lid and immediately I noticed the big problem.



There was a paddle of acid leakage from one of the capacitors.

I was quite surprised with its state and not sure whether
the leakage just started at the capacitor or triggered by other issues on
the board because the amount of leakage was just too much.


I’m glad that it didn’t damage the nearby super capacitor (orange one) used
for the back up system.


This will act as the emergency power in case the car battery is
damaged during the accident.


Kaz




Updated 24-10-2012 at 06:41 PM by Kaz-kzukNA1

Tags: srs Add / Edit Tags
Categories
SRS

Comments