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Old May 24, 2023 | 04:50 PM
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Default Classic ABS.

Is there anyway i can diagnose why my ABS light is not going out on a 1998 uk impreza turbo.
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Old May 24, 2023 | 06:31 PM
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Yes there is a way using the diagnostic connectors under the dash.
Unfortunately I only have the MY97 version (separate control module) as they changed the ABS module for the MY98 ( control module mounted on the ABS hydraulic unit).
However both are fitted with the diagnostic connectors so hopefully the procedure is similar.
For MY98 the diagnostic connectors consist of 2 single pin terminals (B81) and a Black 6 pin connector (B82) with pins 3 and 6 populated and should be located under the dash to the right of the centre console.

If they've not been used they maybe taped up out of the way so not always easy to find.

The MY97 connector is a 2 pin so "terminal pin" references will be different in the procedure.

MY98 Similar location to this, but for a RHD



Attached below is the ABS wiring diagram for the MY98.
Here is the diag procedure and fault codes for the MY97.




Attached Files
File Type: pdf
MY98 ABS wiring diag.pdf (554.4 KB, 0 views)

Last edited by Don Clark; May 24, 2023 at 06:33 PM.
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Old May 24, 2023 | 07:22 PM
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Thanks i will have a look but i think it might be above me.
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Old May 28, 2023 | 09:47 PM
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I diagnosed mine this way, It does look daunting, But once you get the flashing lights, video them on your phone, so you can count the flashes easier. Or pop a video on here and someone might be able to read it for you. It can be like looking into The Matrix sometimes, but then eventually it does click.
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Old Jun 3, 2023 | 06:39 PM
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Which connectors under the dash do i put together and is there any fuses in the circuit and where are they.
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Old Jun 3, 2023 | 07:55 PM
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Originally Posted by johned
Which connectors under the dash do i put together and is there any fuses in the circuit and where are they.
Did you not read post #2 - connector info included ????
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Old Jun 3, 2023 | 08:04 PM
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MY98 ABS wiring diags below
(B81) shows the two individual terminal pin connectors
(B82) shows the 6 pin connector block (black plastic) with pins 3 & 6 wired.


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Old Jun 3, 2023 | 08:18 PM
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Unfortunately I only have the LHD version of the bulkead wiring diagram, but as mentioned in post #2 for RHD it will be located on the right hand side of the centre console, in the same area as the check connector and green test connectors (B75) & (B76)


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Old Jun 3, 2023 | 08:54 PM
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So do i have a g sensor as well.
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Old Jun 3, 2023 | 09:33 PM
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Hopefully You have no G sensor
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Old Jun 4, 2023 | 06:54 AM
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Originally Posted by johned
So do i have a g sensor as well.
One is shown on the wiring diagram and listed in the parts database..............


"G sensor assembly - ABS" P/n: 27540FA021


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Old Jun 4, 2023 | 10:52 AM
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Thanks but where is it positioned.
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Old Jun 4, 2023 | 12:58 PM
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Originally Posted by johned
Thanks but where is it positioned.
Somewhere around the hand brake lever location??







Last edited by Don Clark; Jun 4, 2023 at 01:02 PM.
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Old Jun 4, 2023 | 02:18 PM
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Many thanks so can i test it.
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Old Jun 4, 2023 | 05:33 PM
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Under the dash are 2x yellow plugs joined/2 x black plugs joined ,2x green plugs hanging and 2 single black plugs which i joined and this made the light go on and off in quick sucession and that was it.
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Old Jun 4, 2023 | 07:21 PM
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Under the dash in a fairly close grouping you should have the two two pin green connectors (not connected) and two single pin black connectors (not connected) as per image below....



With these connectors (but maybe taped up out of the way) you should have a 6 pin black connector block with wires in position 3 (Yellow/red) and 6 (White/blue) used for ABS testing.
plus two loose ternminated black wires as shown and marked below



The yellow connectors I would assume as being air bag wiring.
The other connected black connectors could be anything else.

Out of interest what is the 10th character of your VIN? V, W or X?


Last edited by Don Clark; Jun 6, 2023 at 12:07 PM.
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Old Jun 4, 2023 | 07:32 PM
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My 10th character is a w and i connected the two single black connectors in your top diagram the other larger black connectors with 1 wire on one and 2 wires on the other are connected and have been for nearly 25 years,.Thanks.
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Old Jun 5, 2023 | 10:15 PM
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Still stuck.
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Old Jun 6, 2023 | 12:36 PM
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Originally Posted by johned
i connected the two single black connectors in your top diagram
The single pin black connectors should be left unconnected as they are for reading ECU fault codes.

the other larger black connectors with 1 wire on one and 2 wires on the other are connected and have been for nearly 25 years,.Thanks.
If this refers to the black connector plus terminated wires arrowed in red below

Then there's your problem.
If not maybe an image would help clear things up.

However the MY01 seems to use the same black 6 pin connector.
Only pin 6 needs to be connected as per attached pdf below
Attached Files
File Type: pdf
ABS Diag Trouble codes.pdf (604.4 KB, 0 views)
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Old Jun 6, 2023 | 02:51 PM
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Thanks again but i have 2 large black connectors which have always been joined and cannot find any pins.
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Old Jun 6, 2023 | 05:08 PM
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As said before if the ABS diag terminal pins/connector have not been used before they may be taped up out of the way for you to find. (probable back against the loom
they all emerge from the same bit of loom as below


B125/126 - Black Read connectors
B75/76 - Green Test mode connectors
B81 2 diagnosis terminal wires
B82 - 6 pin diagnosis connector
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Old Jun 6, 2023 | 07:05 PM
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Thanks,so i part the large black connectors and put the diagnosis pin in number 6.am i right?.
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Old Jun 6, 2023 | 07:49 PM
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As i've no idea what the large black connectors are, I cannot say as you've not shared any info / images about them.
I thought you couldn't find the single wires?
You are now on your own.
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Old Jun 6, 2023 | 08:26 PM
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I apologise if i have upset you and i believe i have described what connectors i have previously but have not sent any images as i do not have the technology to do so.
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