Cruise - Speed Control Input Voltage

Check the wiring diagram : Later D3 wiring diagrams

On the D3 both sides of the brake switch come from separate fuses. I'd assume the 4 is similar but the wiring diagram is the way to enlightenment.

Edit : And I'd be wrong. S215 on the diagram. Brake light side (NO) goes from Fuse 14P to the BCM (brake light power). The NC side goes from the ECM to ground.

Can the IIDtool monitor the status of the CC enable and CC cancel buttons?

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Originally Posted by Graeme

Can the IIDtool monitor the status of the CC enable and CC cancel buttons?

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It must be able to. That's its primary user interface.

Edit : On the D3 under TDV6 ECM it's the "Speed Control Input Voltage". That gives the voltage on the resistor ladder for the 6 CC buttons. Mine idles at about 4.1V.

My expectations, but my L322 might be different so a check might not be valid for a D4.

Shoulda checked the wiring diagram. The D4 audio side controls are a resistor ladder same as the 3, but it looks like the cruise switches and flappy paddles connect to a LIN module which goes to the BCM. On that note, I'll back away slowly.

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Originally Posted by BradC

It must be able to. That's its primary user interface.

Edit : On the D3 under TDV6 ECM it's the "Speed Control Input Voltage". That gives the voltage on the resistor ladder for the 6 CC buttons. Mine idles at about 4.1V.

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I'm not getting any voltage reading which is where i guess my issue lays. But i'm getting voltage into the clock spring, and i've put a new clockspring in...interesting

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Originally Posted by Skmitchell91

I'm not getting any voltage reading which is where i guess my issue lays. But i'm getting voltage into the clock spring, and i've put a new clockspring in...interesting

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It looks like the D4 uses a little processor in the steering wheel and a one wire LIN bus to the BCM, so you won't see a voltage in the GAP. It'll be an asynchronous serial connection.

Now, easy test is plug the GAP in and try to use its dashboard interface. It's navigated with the cruise control buttons. If that works the problem is elsewhere.

The switches have been known to fail.

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Originally Posted by Graeme

The switches have been known to fail.

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Guess a new switch pack is on the card then [bawl]

Put on the GAP and it's not showing any of the Set Speed buttons as being pushed, strange that all would fail at once. I'll try to chase down a loom too i guess, do all at once

I have a recollection of the existance a loom connecting both switches and therefore the right switch bank may have an impact, but I may be confusing the D4 with my L322 to which I retro-fitted ACC which required a different left switch bank.