Diagnostic Socket on fuse block of '87 760 GLE

Hi all,

My 1987 Volvo 760 GLE has a Diagnostic Socket (located on the fuse block, I
believe it is socket #24 and only has one connector).

Currently, my service light remains on for two minutes after I turn on the
car. I have "tried" to reset the light, it seems easier to pull out the
cluster and reset it this way (keeping all the cables connected).

First off, what is the correct procedure to reset the Service light?

I switched the ignition on, and pushed the button and held it as specified.
It did not clear it. Does the car need to be running?

If there is a code stored on OBD 1, this may cause the service light to not
reset.

I know there was a tip somewhere on how to make a LED indicator and hook it
up to display the codes.

However, I can't find that reference anymore (and it mentioned to hook it up
in the engine bay, maybe previous model years had a different OBD 1
setup?!?, my fuse block is inside the car as I assume most were/are).

Also, is there a list of codes for the number of flashes?

Any help would be appreciated, a link to a website, anything. Winter is
here and I want to clear/repair any code/trouble in the computer, and not be
stranded (or consume a lot of extra fuel if I don't need to.

Thanks!

B280F

 

Sometimes you have to push the button harder than you might expect in
order to reset the light, it's on the front side of the cluster behind
the 70 as viewed from the driver's seat.

The only flashes you get from the test point along the left ftont fender
(blue plug, blue/yellow wire) are for the EZK-1 ignition control unit.
It has no memory and must be monitored with the diode tool connected
when the fault can be recreated with the engine running. The ICU reports
in real time and has no memory retention once the key is shut off.

The fuel injection computer is diagnosed by attaching a throughpass
connector at the control unit that operates an analogue switch box that
allows the operator to read various voltages: coolant temp sensor, O2
sensor sweep, load signal, battery (system), etc.

Also on the left fender there is a black plug with a pink wire that is
the remote starter wire. On the right fender there are two more test
plugs. The green/white wire reads O2 sensor sweep, the black/white wire
grounds the IAC so that base idle can be set to spec.

Compared to current technology it's pretty rudimentay stuff.

Bob

 

<snip>

The test point on the fuse block is for pulling the codes and resetting
the SRS light.

Bob

 

In an '87?

 

I need to stop staying up so late. ABS.

Bob