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Thread: Cruise - Speed Control Input Voltage

  1. 24th July 2024, 04:33 PM #21
    BradC
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    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.
    MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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  2. 24th July 2024, 04:56 PM #22
    Graeme
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    Can the IIDtool monitor the status of the CC enable and CC cancel buttons?
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  3. 24th July 2024, 05:16 PM #23
    BradC
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    Quote Originally Posted by Graeme View Post
    Can the IIDtool monitor the status of the CC enable and CC cancel buttons?
    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.
    MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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  4. 24th July 2024, 05:22 PM #24
    Graeme
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    My expectations, but my L322 might be different so a check might not be valid for a D4.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  5. 24th July 2024, 05:48 PM #25
    BradC
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    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.
    MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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  6. 24th July 2024, 09:05 PM #26
    Skmitchell91
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    Quote Originally Posted by BradC View Post
    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.
    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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  7. 24th July 2024, 09:50 PM #27
    BradC
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    Quote Originally Posted by Skmitchell91 View Post
    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
    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.
    MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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  8. 25th July 2024, 05:53 AM #28
    Graeme
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    The switches have been known to fail.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  9. 25th July 2024, 06:49 AM #29
    Skmitchell91
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    Quote Originally Posted by Graeme View Post
    The switches have been known to fail.
    Guess a new switch pack is on the card then

    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
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  10. 25th July 2024, 07:05 AM #30
    Graeme
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    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.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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