Using a careful hand, the ECU isn't hard to open up. A magnifier with
light helps. I've found that to be a useful tool for lots of other
things.

Do you have access to an AFM "pigtail" ?   Have you ruled out "Vanagon
syndrome" ?

I'm pretty sure the seat belt warning light isn't on a timer.
Regardless, it's connected to the 15 buss. The ignition system etc.
connects to the 15 buss.

P 97.133 shows S18 as the fuse for the seat belt and brake warning
light etc. parts. Be aware that your '88 may use '87 wiring. This is
what I found on my '88.

@ list: Could Greg remove the S18 fuse for test drive purposes? Aside
from having no brake, seatbelt warning lights, AFAIK, this would be
ok.

Neil.

On 2/10/14, Gregory Smith <gfs@gregoryfsmith.com> wrote:

>
> This seemed to fix it for exactly 2 months.  Then it started again.

> I'm left with the ECU, like possibly cracked solder joints or something like
> that, or possibly the power wire to the ECU from the alternator.  I read
> about this on the Samba, someone found this wire frayed inside the
> insulation, under the AFM.  I'll check on this today.
>
> Another thing that sometimes occurs that may be related, but is not
> synchronized with this problem is sometimes while driving the seatbelt
> warning light will come one and go back out (I think it's on a timer).

--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG *Gas* inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej