Dave21
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Adding Cruise Control to C7
- Thread starter wehring
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Dave21
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[FONT="] See third page # 21[/FONT]
Dave21
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[FONT="] Just hooked up my cruise control on a cat C7 . It works just fine . But when applying the brake it does not kick it out of cruise control . It looks like the brake light switch was never hooked up to the ECU . If you solve this problem what pin on the ECU did you hook up to the brake light switch .Thanks[/FONT]
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I have the cruise control module ready for some time now. Works perfectly. I have a complete install kit for sale on eBay and in the classifieds section if somebody is interested.
The service brake #1 is pin number 45. The ECU doesn't see when the service brake pedal is pressed. In order to disengage the cruise control you have to at a relay. Original its like this : pin 45 is normally closed to the H795 ( H795 is the AP SENSOR/SWITCH SENSOR COMMON ). In order for the ECU to see that the brake is pressed the connection has to be opened ( Broken ) you do this with a 5 pin automotive relay.
Relay pin :
30 = H795 ( get it from the High Idle switch that's the easiest )
87a = pin 45 CAT ECU
85 = 12v upper pin from brake light switch
86 = Common ground
Pin 45 on the CAT ECU is connected to the H795 originally but I don't now where. Probably somewhere underneath the dashboard. So here is what you have to do: At the CAT ECU cut the wire that is coming from pin 45 from the ECU and solder a new wire to the end that is going to the ECU. Run that wire to the 5 pin relay and connect it to 87a. Now when you press the brake pedal the relay brakes the connection and the ECU nows that the brake is applied and the cruise control disengages.
The service brake #1 is pin number 45. The ECU doesn't see when the service brake pedal is pressed. In order to disengage the cruise control you have to at a relay. Original its like this : pin 45 is normally closed to the H795 ( H795 is the AP SENSOR/SWITCH SENSOR COMMON ). In order for the ECU to see that the brake is pressed the connection has to be opened ( Broken ) you do this with a 5 pin automotive relay.
Relay pin :
30 = H795 ( get it from the High Idle switch that's the easiest )
87a = pin 45 CAT ECU
85 = 12v upper pin from brake light switch
86 = Common ground
Pin 45 on the CAT ECU is connected to the H795 originally but I don't now where. Probably somewhere underneath the dashboard. So here is what you have to do: At the CAT ECU cut the wire that is coming from pin 45 from the ECU and solder a new wire to the end that is going to the ECU. Run that wire to the 5 pin relay and connect it to 87a. Now when you press the brake pedal the relay brakes the connection and the ECU nows that the brake is applied and the cruise control disengages.
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the mammoth 370
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I would like to purchase that kit. Call me 305-3316144
When will you have some more on eBay?
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I just relisted it. So it's available again. If you buy directly from me, it saves you $25 in eBay fees.
Third From Texas
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I'm looking to do a wired solution on the dash or column.
Am I mistaken in that all I need for my C7 is a 5-pin relay and a switch setup?
Am I mistaken in that all I need for my C7 is a 5-pin relay and a switch setup?
I saw broke overland install this one:
I ran across this video too discussing the circuit.
Not sure you'd even need the relay after studying this a bit as it seems the brakes do the relay.
But .....
Seems like there might be a cab controller that talks to the ECM that appears is in Broke Overlands video and referenced in the Cat Cruise Control video.
Not sure you'd even need the relay after studying this a bit as it seems the brakes do the relay.
But .....
Seems like there might be a cab controller that talks to the ECM that appears is in Broke Overlands video and referenced in the Cat Cruise Control video.
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Broke overland installed it incorrectly BTW. Don't follow his wiring. Follow the instructions from Berend. Mine works great.
With the C7 the ECM will disable the PAC brake when the CC is turned on unless you depress the brake pedal. With the CC off the PAC brake will engage when you lift off the throttle (assuming you have it in retard mode).
Just get the kit from Berend. It works excellent. Broke Overland initially installed it incorrectly and Berend worked with him to get that sorted out.
With the C7 the ECM will disable the PAC brake when the CC is turned on unless you depress the brake pedal. With the CC off the PAC brake will engage when you lift off the throttle (assuming you have it in retard mode).
Just get the kit from Berend. It works excellent. Broke Overland initially installed it incorrectly and Berend worked with him to get that sorted out.
ramdough
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There is a way to wire cruise with just switches, but Berends kit is much cleaner. With switches, your ECM needs to be programmed to run cruise. I am not sure about Berends kit.
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You still have to enable it on the C7 ECM. You need CAT ET and a compatible J1939 adapter or you need to take the truck to a CAT dealer. If you have the software and adapter it literally takes about 2 minutes to enable cruise. From the factory these engines have the cruise minimum enable speed set to 127 mph.
Third From Texas
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Heh, the only way one of these trucks sees 127mph is in freefall....
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Hmmm... I swear that truck looks much shorter than I remember.
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Not likely. Cruise helps with fuel economy and thus emissions and truckers would lose their $hit.
Third From Texas
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Yeah, but I bet you get out and do trending YouTube dances while your truck is moving.
Tens and tens of views....
;p
??????? i dont get it !
Third From Texas
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