1992 (91 US model) 940 GLE sedan, 120K kilos (80K miles), immaculate B234F.

After a few months of indoor storage, the ABS light goes on on the dash.
Never had problems with ABS.

The fuse panel has no ABS fuses.
Where is there a fuse?

Thanks in advance!
Greg

Dear Greg,

Good p.m. and may this find you well. Not owning a 1992 or 1991 car, I don't have the wiring diagrams for those model years.

However, on the 1993 940s, there is an overload protection relay, for the ABS control unit. This relay is mounted underneath the dashboard, on the driver's side (USA/Canada models).

Sometimes the ABS warning light comes on, and stays lit, because of transient power surges. Before going to the trouble of accessing the relay, power-down the entire electrical system, by disconnecting the negative battery cable clamp, from the battery. Put the clamp into a plastic bag, to isolate it.

You'll need your car's radio security code, to re-activate the radio. If you don't have the code, give the Vehicle Identification Number to a dealer's service dept., & they'll give you the Code.

Wait 15 minutes. Re-connect the negative battery cable clamp to the terminal. Start the car. Start the car. If the ABS light goes out, and stays out, you've solved the problem. If the ABS light comes back on, and stays on, you need to go further.

Turn-off the engine. Check the On-Board Diagnostic Codes (in the engine bay, against the driver's side strut tower [USA/Canada models]). The ABS system status can be reviewed, by putting the probe into Socket A-3. See the 700/900 FAQs, under site features, for how to get and interpret the codes. Read and post back with any codes, not explained in the FAQs. The ignition key should be in the start position - dash warning lights lit - but the engine should not be running.

If you want to inspect the relay's fuse, turn-off the engine. Again remove the negative battery cable clamp from the battery, and isolate it, in a plastic bag.

To access the relay, remove the panel under the steering wheel. There are two or three large, round, fasteners, that when turned, should drop out or be finger-removable. Pull the panel down and back. You will need to lay on your back, to look under the dashboard.

The relay is mounted against the side panel, to which the door is hinged (i.e., the side of the enclosure opposite the front center console). The relay is affixed with a metal clip. Push the relay upwards, to disengage it. There is no need to remove the wiring harness from the relay.

The relay is about 1" (25mm) square and about 2" (50mm) tall. I believe this relay's body is aluminium-coloured: it has a red plastic "cap". The fuse - it is Red ⎖ Amps] - is inserted into this red plastic cap. This fuse is a spade-type, the same as you find in the main fuse block.


Hope this helps.

Yours faithfully,

spook

In a 960, the ABS is fused in the main fuse box under the ABS unit and near the battery. I'm not sure if the 940 & 960 share a similar configuration. In a 93 960 the ABS fuse is number 5

The only fuse for that system is located in the transient surge protector, mounted beside the EZK control unit above the driver's left foot. Just leave the key off you will not blow anything up if you don't disconnect the battery while in there. It is kind of a pain in the ass to get in there with the SRS knee bolster in the way but if it really bothers you it can be pulled out in only a couple of minutes and then you will have room for days to see what you are doing. I do not know what causes these "transient surges" but from time to time I will get one in the shop. I replace the fuse and move on, I have never had a car with a reoccuring problem with it.

Mark

Hello. I have found the relay to go bad as well. There is a fuse above the relay 10 amp, but sometimes the contact sticks in the open position causing the ABS light to come on. I have fixed them by taking apart, but it is difficult, because the aluminum housing tends to tear. Good luck, Pauli