I would like to wire in a toggle switch to turn the ABS system on and off. My chassis a 91 318iS so keep in mind it does not have the ABS relay under the dash like the earlier cars, it's part of the ABS pump itself. The ABS pump and ABS computer power run through the C101, pin 20.
Ideally how I would like it to work:
My original plan was to tap into the red/yellow power wire that leads into the ABS computer under the dash. Another option would be to cut into the ground wires going to the ABS computer, although my rudimentary electrical knowledge leads me to believe that if I switch the ground I won't be able to utilize the LED on the toggle switch.
On my car the red/yellow power wire comes off Pin 20 of the C101 and it splits to power both the ABS pump and the ABS computer. To keep all the associated wiring inside the cabin, I planned to tap the red/yellow right by the ABS computer instead of in the engine bay.
Would one be preferable to the other? Would killing the power input to the ABS computer kill the ABS system but also allow the cluster light to turn on? Would it be better if I tapped the red/yellow wire further back closer to the C101?
Let me know if I am on the right track with this. Searching didn't come up with much, most people just said "pull the relay" to disable ABS. For reference, here is a link to the ETM for this chassis: the ABS computer and relay are on pages 26 and 27 of the PDF: click here
Ideally how I would like it to work:
- With the ABS enabled, the cluster light is off and the toggle switch is switched on and the LED light is illuminated
- With the ABS disabled, the ABS light on the cluster would turn on, the toggle switch would be switched off and the LED would turn off
My original plan was to tap into the red/yellow power wire that leads into the ABS computer under the dash. Another option would be to cut into the ground wires going to the ABS computer, although my rudimentary electrical knowledge leads me to believe that if I switch the ground I won't be able to utilize the LED on the toggle switch.
On my car the red/yellow power wire comes off Pin 20 of the C101 and it splits to power both the ABS pump and the ABS computer. To keep all the associated wiring inside the cabin, I planned to tap the red/yellow right by the ABS computer instead of in the engine bay.
Would one be preferable to the other? Would killing the power input to the ABS computer kill the ABS system but also allow the cluster light to turn on? Would it be better if I tapped the red/yellow wire further back closer to the C101?
Let me know if I am on the right track with this. Searching didn't come up with much, most people just said "pull the relay" to disable ABS. For reference, here is a link to the ETM for this chassis: the ABS computer and relay are on pages 26 and 27 of the PDF: click here
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