Speed pulse signal
Discussion
Ringram is right...
It's actually a Violet wire with white trace going into pin 17 on the Instrument cluster.
This is direct from PCM. (sometimes this has been just purple with no trace, Gm using up some old wire I think.)
Use this as preferred.
Another option:
There is also a Brown with Red trace tacho signal on Pin 18 that is used for TCS and ABS.
Don't use if you can avoid it, but if the Purple/White doesn't work. Connect into this and then test TCS and ABS prior to an emergency use.
Better to upset rev counter than ABS/TCS if badly loaded. However, this is unlikly due to buffering in most modern installed SATNAVs,..... but as you haven't specified type, i'm just being careful.....?
Cheers
Eric
It's actually a Violet wire with white trace going into pin 17 on the Instrument cluster.
This is direct from PCM. (sometimes this has been just purple with no trace, Gm using up some old wire I think.)
Use this as preferred.
Another option:
There is also a Brown with Red trace tacho signal on Pin 18 that is used for TCS and ABS.
Don't use if you can avoid it, but if the Purple/White doesn't work. Connect into this and then test TCS and ABS prior to an emergency use.
Better to upset rev counter than ABS/TCS if badly loaded. However, this is unlikly due to buffering in most modern installed SATNAVs,..... but as you haven't specified type, i'm just being careful.....?
Cheers
Eric
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