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05-25-2020, 07:17 AM | #26 | |
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07-23-2022, 04:43 PM | #27 |
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how did you ground it? im having same problem.
please help |
07-23-2022, 04:43 PM | #28 |
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how did you ground it? im having same problem.
please help |
07-23-2022, 04:45 PM | #29 |
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how do you ground the orange wire?
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07-23-2022, 04:47 PM | #30 | |
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07-23-2022, 06:44 PM | #31 |
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In order to make a connection to ground simply connect the wire to a good connection to chassis ground of the vehicle. When you do that though that will bypass the dimmer control circuit and the light will be full brightness.
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08-24-2022, 05:12 PM | #32 |
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I'm having a similar problem in my 06 impreza 2.5i. The cluster and hvac night time illumination does not work. no blown fuses. I want to ground that orange wire mentioned above, but i first checked to see if it had power, and it reads 12v. Grounding a live wire does not seem like a good idea. am i missing something here?
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08-24-2022, 08:46 PM | #33 |
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If the lighting circuit uses the same wire colors as the earlier models, then the power side of the light is violet and the return side of the light uses an orange color wire. The return side is connected to the light dimmer circuit and then to ground. So, the lighting control uses the return side of the circuit to control the brightness. You are correct about not wanting to ground the power to the light (violet wire), you want to ground the return side (orange wire) of the light circuit. When that is done though there will be no dimming of that light because the light is now directly connected to ground instead of going through the dimmer control. Whenever you measure voltage on an open circuit, (no current can flow because the circuit is incomplete) the voltage reading will show whatever the voltage is from the power supply source. On a working circuit the voltage on the ground side of the circuit will be zero, it is connected to ground (the reference point). But when the ground lead to the circuit load is opened up then there will be full voltage on that lead.
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08-24-2022, 09:12 PM | #34 | |
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08-25-2022, 03:06 PM | #35 |
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I just double checked. both the violet AND the orange/white light up my test light when i turn on the lights. both are live. even if i disconnect the connectors from the module. Do i sill ground that orange/white wire? that won't burn anything up?
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08-25-2022, 07:19 PM | #36 |
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If you are trying to repair the dash lighting correctly then you will most likely have to replace the control module for the lighting. When you ground the orange wire that should turn on whatever dash lights that wire is tied to, to full brightness. You won't be able to dim the lights. The module changes the resistance to ground for the lights. When there is no or very little resistance the lights glow their brightest. When the module has high resistance then the lights are dim due to less current flow through them.
When you connect your test light to orange wire, with the power ON, see if the dash lights turn on a little bit. It may need to be fairly dark out to see them. If you do see some light that proves the lights will glow if you ground the orange wire. |
08-25-2022, 07:20 PM | #37 |
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You need to understand what happens in a series circuit when it is connected normally to power and when the circuit is open, and no current can flow. Along with doing testing on the circuit and what the expected results should be.
If you are trying to repair the dash lighting correctly then you will most likely have to replace the control module for the lighting. The module is most likely damaged. When you ground the orange wire that should turn on whatever dash lights that wire is tied to, to full brightness. Grounding the orange wire will bypass the control module. You won't be able to dim the lights. The module changes the resistance to ground for the lights via the dimmer control adjustment. When there is no or very little resistance through the module the lights glow their brightest. When the module has high resistance then the lights are dim due to less current flow through them. This is a series circuit, so all the loads in the circuit share the power supplied to them and the total current is the same through each component. When you connect your test light to orange wire, with the power ON, see if the dash lights turn on a little bit. It may need to be fairly dark out to see them. If you do see some light that proves the lights will glow if you ground the orange wire. Last edited by Cougar4; 08-25-2022 at 07:39 PM. |
08-26-2022, 12:23 PM | #38 | |
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My main question and/or confusion is about "grounding" a wire with voltage on it. I'm having a hard time understanding how that won't cause sparks, a short and a blown fuse or worse... I just want to make sure i'm not misunderstanding and make things worse. |
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08-27-2022, 07:10 PM | #39 |
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Follow the instructions I gave you in the last sentence of my previous post. The orange wire of the lights is the RETURN side of the light. The power is tied to the other side of the light. All current flow from the power source has to flow through the light. The resistance of the light is what limits the current flow. In order to make sparks fly you would have to connect the violet wire to ground.
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08-28-2022, 10:02 PM | #40 | |
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Thanks for your help. |
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08-30-2022, 02:21 AM | #41 |
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To fix the problem you will most likely need to replace the illumination control module or body control module. No problem leaving it as is if you want to.
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08-30-2022, 02:22 PM | #42 |
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awesome. my horn that hasn't worked for a while suddenly went off twice yesterday as i was idling. Any chance that same module has control over the horn too?
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08-30-2022, 02:52 PM | #43 |
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The lighting is controlled by the BIM module. Look for blue and gray plugs connecting to it just to the right side of the steering column. The horn is controlled by the horn relay which have several things that can turn the relay on. I would suspect the horn switch as the most likely cause of the problem. The switches make a ground connection to turn on the horn relay.
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08-30-2022, 05:40 PM | #44 | |
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I was just simply wondering if the horn was one of the 15 things subaru routed through there lol . But you already answered no. so i'll go check the relays. It's just weird that it honked just randomly, without me touching the airbag. Thanks again for all the help. |
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08-31-2022, 05:20 PM | #45 |
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The horn problem is most likely due to an intermittent connection to ground located in the steering wheel or column, which controls the relay.
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09-14-2022, 03:04 AM | #46 |
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Mystery harness plug
in this general area i noticed a 4 pin plug hanging around not married to anything. the plug itself looks as though it has no where to go. its near the dimmer and mirror control switches.
i am installing Bypass Module for a proximity lock/unlock feature. i noticed this when pulling the lower dash cover off and found it branching off the larger harness above interior fuse panel. mystery 4 Pin colors: violet, black/yellow, orange, black/white 2012 WRX |
09-18-2022, 04:42 PM | #47 |
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UPDATE:
Just wanted to share some info i discovered that in all my research(here and elsewhere) i did not see. The problem was not the BIM. And the horn issue IS related. I replaced the BIM, nothing changed. so i decided to try and fix my horn. I figured, why not. I diagnosed my bad horn as a clockspring issue, replaced it, the horn started working, and so did the dash lights lol. Everything works just fine now, lights, dimmer stick, horn. So you can go ahead and add "clockspring" as a potential fix, for the common, no dash lights issue. |
09-18-2022, 04:43 PM | #48 |
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Member#: 358623
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UPDATE:
Just wanted to share some info i discovered that in all my research(here and elsewhere) i did not see. The problem was not the BIM. And the horn issue IS related. I replaced the BIM, nothing changed. so i decided to try and fix my horn. I figured, why not. I diagnosed my bad horn as a clockspring issue, replaced it, the horn started working, and so did the dash lights lol. Everything works just fine now, lights, dimmer stick, horn. So you can go ahead and add "clockspring" as a potential fix, for the common, no dash lights issue. |
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