So without even thinking, I pulled a bunch of the relays out from under the hood of my wagon. I made the grand assumption that they would be the same between sedan and wagon. They're not. D'oh.

The sedan has the (front to back) stepping relay (big metal one), junction “box” (small, flat, black plastic), and what I assume is the lambda relay (the small metal cue). The wagon had two extra relays (gray/white plastic cube, and a slightly larger black plastic cube).

All of the relays have Bosch markings (and no Volvo PN), all are rated at 20/30 amps and 12 volts. The Bosch part numbers start with 0 332 204 and end with 101, 158, and 172. I don't understand the diagrams on the side of the relays, but they've all got the same circuit(?) numbers (30, 85, 86, 87, 87a) and the diagrams are slightly different.

I stuck them on the scanner and put some pictures up here.

- alex

'85 244 Turbo
'84 245 Turbo

Alex -

The diagrams on the side of the relay can be very helpful. Relays have generally the same contents, here's a quick layout:

First there is a magnetic coil. The terminals for that are usually #85 and #86. Look at one of the diagrams and find that.

Next there is a piece moved by the magnetic field, it's called the armature. It has a connection to it, #30, and is shown as connected to the pivot point.

The #30 can connect to one contact if the relay is open, and another when the relay is closed. Not all relays have the N.O. contact, those will have only four terminals on the base. The central locking system uses two of the five-terminal type relays.


When there is no magnetic field, the armature is in open position, and sometimes there is a contact there, #87a. That's so that if the relay is not acutated, current can flow from #30 to #87a. This is the N.O. (normally open) contact.
The contact that gets current when the relay is actuated is #87. It is called the NC (normally closed) contact.

Variations from the "Plain Vanilla" relay come in with circuit boards for toggling (o/d relay) and time delay (a/c relay) and some others mods. But basically you can tell a lot from looking at the diagrams on the side.

Your 240 has a wiper delay on the rear window, right? One of your mystery relays might be that.

Sometimes the only way to identify a relay is by the colors of the wires to it, in addition to its location. What terminal number gets what color wire?

Good Luck,

Bob

:>)

Bob, I suppose you understand now why I feel a bit stupid for not labeling the things before pulling them. All the relays have five terminals, etc.

Pictures 19, 24, and 26 show the diagrams.

Two relays are identical appearing except for different Bosch P/Ns and the one has #86 above the magnetic field? and #85 below, the other has them reversed. The third relay is identical to the second except that there's an arrow from #85 to #86 going around the box that I imagine represents the magnetic field.

P.S. Yes, I think my wagon has an intermittent setting for the rear wipers.. but aren't those relays both under the “footrest” and not under the hood?

- alex

'85 244 Turbo
'84 245 Turbo