brake light in dash
Launching!
Joined: Nov 2015
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This light also monitors the Electronic Brake Control Module. Since you have replaced the level sensor and e-brake switch, I would suggest scanning the ABS system for trouble codes to see if the problem is there.
The ABS has a different light, "ABS INOP" when it has a problem. The "BRAKE" light is only for the hydraulic system and the parking brake.
I would start by spoofing the sensor and e-brake switch to have them send a nominal signal to the car and see if either is still bad. Unplugging the switch, so the wire doesn't touch anything, should do the trick for that. I'm not sure about the fluid level sensor.
If anything is touching the switch so that the wire sees ground, the system will think the emergency brake is applied.
I would start by spoofing the sensor and e-brake switch to have them send a nominal signal to the car and see if either is still bad. Unplugging the switch, so the wire doesn't touch anything, should do the trick for that. I'm not sure about the fluid level sensor.
If anything is touching the switch so that the wire sees ground, the system will think the emergency brake is applied.
Launching!
Joined: Nov 2015
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According to the service manual, The EBCM also sends a class 2 serial message to illuminate the red brake indicator and the troubleshooting guide states to check ABS DTC before using the guide. I've attached a troubleshooting guide for the brake warning light.
Last edited by peterpar; Dec 28, 2017 at 09:43 AM.
Thanks for the reminder ^. This has come up before (that ABS faults trigger multiple lights) and I forgot that the Owners Manual doesn't call out ABS faults, but the Service Manual is more specific/detailed.
More often than not, for cars of our age, we see this issue with the emergency brake switch. With the switch not actually switching anything, but providing a path to ground, the circuit is really sensitive. A hairball at the switch connection, etc. is all that is needed sometimes to set the light off.
That being said, if there is a hydraulic or ABS issues, that's a very serious thing and the car shouldn't be driven.
More often than not, for cars of our age, we see this issue with the emergency brake switch. With the switch not actually switching anything, but providing a path to ground, the circuit is really sensitive. A hairball at the switch connection, etc. is all that is needed sometimes to set the light off.
That being said, if there is a hydraulic or ABS issues, that's a very serious thing and the car shouldn't be driven.
Does anyone have a drawing for the EBCM? (1995 in my case)
I've deleted ABS and grounded the lt grn wire to shut off the brake & ABS light, but i'd like to know what this is actually doing/connected to.
Thanks
I've deleted ABS and grounded the lt grn wire to shut off the brake & ABS light, but i'd like to know what this is actually doing/connected to.
Thanks
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Thanks for that.
Do you have the complete schematic for all the connections on the EBCM?
My 95 is an LS swap car and I also have the LOW OIL LEVEL light on because that was not wired in the engine harness. It has went off since unplugging the EBCM and grounding the lt grn wire. I'm trying to understand why, and anything else this may be affecting.
EDIT: My mistake, I didn't notice PAGE 2 until I went thru it again. I already put my lower dash back together before counting the wires on that plug.
As suspected, nothing about oil level on the schematic.
Do you have the complete schematic for all the connections on the EBCM?
My 95 is an LS swap car and I also have the LOW OIL LEVEL light on because that was not wired in the engine harness. It has went off since unplugging the EBCM and grounding the lt grn wire. I'm trying to understand why, and anything else this may be affecting.
EDIT: My mistake, I didn't notice PAGE 2 until I went thru it again. I already put my lower dash back together before counting the wires on that plug.
As suspected, nothing about oil level on the schematic.
Last edited by 95wannabe; Feb 25, 2018 at 07:34 AM.
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Joined: Nov 2015
Posts: 206
Likes: 13
The instrument cluster has a solid state control that both circuits go into. This board provides a ground for both warning lights, but I couldn't find a schematic that shows the internal circuitry of the board to explain how grounding the lt green from the EBCM would effect the oil level indicator.
Thanks again peterpar!
I think I'm seeing some of these conditions show up now.
I originally saw the light go out when the others did and thought that fixed it, but it didn't. It has come on again at startup a couple times and then off. I think when the other 2 lights went out, I didn't pay close enough attention to realize the oil light wasn't ALWAYS on.
I'll check whats connected to C220 C . I'm guessing nothing off the top my head.
I think I'm seeing some of these conditions show up now.
I originally saw the light go out when the others did and thought that fixed it, but it didn't. It has come on again at startup a couple times and then off. I think when the other 2 lights went out, I didn't pay close enough attention to realize the oil light wasn't ALWAYS on.
I'll check whats connected to C220 C . I'm guessing nothing off the top my head.