ABS obd1 reader on Volvo 850 1994. Constant light, no code. Topic is solved

Evolvo850B · Post by **Evolvo850B** » 30 Nov 2025, 11:41

Volvo 850 1994
Hi! I have a problem with the obd1 reader on my Volvo 850 1994.
I first tried and got a bunch of codes on the ABS. Then I would clear them and then it stopped giving me anything at all.
I also tried replacing the ABS module. but still the same problem.

Would like to see the fault codes on the ABS. But as soon as I put the plug in A3 the light comes on a little.
When I press the button the light comes on but nothing happens, no 1-1-1 or anything.
When I test other sockets for example A2 I get 1-1-1
But the socket for ABS gives nothing but lights up when I press it, and as soon as the pin is in the socket it lights up a little… any tips?

aeg · Post by **aeg** » 30 Nov 2025, 17:21

Check the ABS fuse?

Evolvo850B · Post by **Evolvo850B** » 01 Dec 2025, 09:14

Yes, checked all fuses. Removed the battery over the night. Have seen people having this problem before but no solution..

Evolvo850B · Post by **Evolvo850B** » 01 Dec 2025, 12:49

I thought I would do everyone who has this problem in the future a favor and write the solution I never found online

What worked for me was that when the car was on and the cable was in the A3, I pulled out the fuse for the abs module. Then I put it back in. The module clicked and the constant light went out. Then I could see the codes and clear them.

Post by **wizechatmgr** » 02 Dec 2025, 00:33

Guessing this was a 3rd party scan tool - not a real volvo scan tool?

If so, I've encountered this before with my Maxidas *Autel* scan tool before.

Evolvo850B · Post by **Evolvo850B** » 02 Dec 2025, 12:22

wizechatmgr wrote: ↑02 Dec 2025, 00:33 Guessing this was a 3rd party scan tool - not a real volvo scan tool?

If so, I've encountered this before with my Maxidas *Autel* scan tool before.

This was the built in OBD1 on 850s before 1995. No obd2