760 Intermittent wiper Mod - may fit other 7/9xx

[Laird Scooby]

While trawling the forum in general one day, i came across this article :

https://www.volvoforums.org.uk/showthread.php?t=97299

After a fair bit of double-checking, cross-referencing etc, i found the intermittent wiper relay and associated wiring in my 760 was similar so i bought one of those VAG "Relay99" and swapped them over.

This is the result with the delay set to very short (about 2-3 seconds) at first then extended to about 20 seconds.

https://youtu.be/LIC5EiN45YI

Later in the video it also shows that you now get 3 wipes with the wash function instead of 4 but what isn't obvious is a half second delay from pulling the stalk to wash before the wipers start - reduces the risk of trying to wipe a dry screen!

It also shows the other little wiper system update, the S/V40 fan/mist washer jets that vastly improve the washing of the screen.

Operation is as described in the link but some extra information is VAG cars used this relay from 90-94 and 97-2004 and it's easiest found on fleabay by searching for either VAG 357 955 531 (part number) or for "VAG Relay 99" but make sure the part number is correct.

While i know it works in the 760, i am fairly sure it will work in the 740 and 9xx models as long as the pinout on your intermittent relay has the same pinout as this one :



The 760 has horizontal relays so uses a different part number to the 740 which will have a vertical relay, the 960 probably uses the same part number as the 760 so would suggest the 940 would use the same as the 740.
The important bit is the pinout and the wiring - the wiring diagrams appear the same for those models so as long as the pinout on the relay is the same, it should be a nice, cheap, easy mod.