1998 940, diagnostic light stays on

[StephenAtty]

Among the list of things my 1998 940 estate failed it's MOT for was the ABS light not comming on, which turned out to be due to the bulb being removed, probably because it does not go out when expected.
I've had a look at the front ABS sensors and they both appear to be open circuit, so I'll look into getting those replaced.

I'd like to use the onboard diagnostics via the OBD type connector under the centre arm rest to see if there was any other complaints from it, but the diagnostic LED never turns off after turning the key to position two, neither does probing the other diagnostic pins change the state of the LED.

Any suggestions of what I might be doing wrong?

As per this thread, I'm trying these pins
1: ignition
3: fuel
5: ground
7: SRS (possibly)
12: ABS
13: cruise control
16: +12v

[griston64]

Originally Posted by StephenAtty

Among the list of things my 1998 940 estate failed it's MOT for was the ABS light not comming on, which turned out to be due to the bulb being removed, probably because it does not go out when expected.
I've had a look at the front ABS sensors and they both appear to be open circuit, so I'll look into getting those replaced.

I'd like to use the onboard diagnostics via the OBD type connector under the centre arm rest to see if there was any other complaints from it, but the diagnostic LED never turns off after turning the key to position two, neither does probing the other diagnostic pins change the state of the LED.

Any suggestions of what I might be doing wrong?

As per this thread, I'm trying these pins
1: ignition
3: fuel
5: ground
7: SRS (possibly)
12: ABS
13: cruise control
16: +12v

Have you made a code reader for it ? Loki on here makes them if not

It will also tell you what abs sensor is faulty

see here https://www.volvoforums.org.uk/showt...=247444&page=2

[Laird Scooby]

Originally Posted by StephenAtty

Among the list of things my 1998 940 estate failed it's MOT for was the ABS light not comming on, which turned out to be due to the bulb being removed, probably because it does not go out when expected.
I've had a look at the front ABS sensors and they both appear to be open circuit, so I'll look into getting those replaced.

I'd like to use the onboard diagnostics via the OBD type connector under the centre arm rest to see if there was any other complaints from it, but the diagnostic LED never turns off after turning the key to position two, neither does probing the other diagnostic pins change the state of the LED.

Any suggestions of what I might be doing wrong?

As per this thread, I'm trying these pins
1: ignition
3: fuel
5: ground
7: SRS (possibly)
12: ABS
13: cruise control
16: +12v

Like Mark said, you have the later system that needs an EOBD-II type plug with a bespoke reader on the end to plug into the socket in the centre console.

Do you have any other warning lights on with the ABS light?

[StephenAtty]

I jury rigged a few crimp connectors and a LED to make my own from bits I could find in my garage of a Sunday afternoon.

Just realised that I had the momentary switch on the diagnostic pin (12 for ABS) when it should have been on the ground (pin 5) which gives me a fault code of 1-5-1

This is the correct way around of wiring the simple reader


https://www.volvoforums.org.uk/showt...=247444&page=3