Rain Sensing Wiper Add

[Abominable]

Hey guys, I'm new to this forum as I just got my lightning about 2 weeks ago, but I have managed to successfully make a few changes to my lightning with no problem, however when I decided to add the rain sensing wipers to my truck and follow another thread, I cant seem to make it happen. I have added the rain sensor to the rear view mirror area and made sure it is fully plugged in, and I have made the necessary changes in forscan and reset each module after the change. Here are the codes I used for reference;

7D0-09-04 x3xx-xxxx-xx—
726-39-02. xxxx-xxxx-01—
720-02-02. xx8x-xx—
724-02-01 xxxx-xC4x- —

but it doesnt seem to be working. I have the option to turn it on in my screen, but it only functions like a normal intermitent wiper. IE... I put it on 1 rain drop and it wipes every about 15 seconds and so on all the way up to the highest setting. I'm not sure what I've done wrong, but its just not working. Any help is appreciated.

Thanks!

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[carys98]

I have the same problem. I saw one post that the 726 change wasn’t necessary but I haven’t tried to undo it. I’m not sure how that would make a difference but I will eventually give it a try.

 

[jbirdzee]

I had this issue also, but it turned out that even though the connector was present, it did not have the LIN bus or +12V power running to it from the harness that runs up the A-pillar. I had to add those wires myself. My steering column control module threw a code when I enabled rain sensing wipers saying that the sensor was not found (i'm going off of memory at the exact text it said). Turn on your wipers and check the 3-pin to the sensor - see if it has the 12V on it before messing with Forscan settings further.

 

[jbirdzee]

The 726-39-02 change in the BCM, AFAIK - is just to make the headlights turn on with the rain sensor. I left this change out when I set up mine.

 

[Abominable]

I had this issue also, but it turned out that even though the connector was present, it did not have the LIN bus or +12V power running to it from the harness that runs up the A-pillar. I had to add those wires myself. My steering column control module threw a code when I enabled rain sensing wipers saying that the sensor was not found (i'm going off of memory at the exact text it said). Turn on your wipers and check the 3-pin to the sensor - see if it has the 12V on it before messing with Forscan settings further.

ill check it as soon as i can. mine doesn't throw any codes though. thanks for the info.

EDIT: as it turns out, i do not have 12v at the plug. what all did you have to do to get it working? is there a harness i need to purchase? or?

 

[jbirdzee]

So infotainment.com sells a kit with a turn signal stalk, rain sensor, and diy harness - but you've already got the sensor and from what I understand the newer stalks are all compatible now. Other forum members have asked @Jesse-Infotainment if they can purchase just the harness and i think he does that - maybe reach out to him if you want the easy option.

i was running wires for other projects in the truck so i just ran these myself - but it is more work. The infotainment harness has the connectors to plug into the steering column module.

 

[Abominable]

So infotainment.com sells a kit with a turn signal stalk, rain sensor, and diy harness - but you've already got the sensor and from what I understand the newer stalks are all compatible now. Other forum members have asked @Jesse-Infotainment if they can purchase just the harness and i think he does that - maybe reach out to him if you want the easy option.

i was running wires for other projects in the truck so i just ran these myself - but it is more work. The infotainment harness has the connectors to plug into the steering column module.

thanks so much for the info!

 

[Abominable]

So infotainment.com sells a kit with a turn signal stalk, rain sensor, and diy harness - but you've already got the sensor and from what I understand the newer stalks are all compatible now. Other forum members have asked @Jesse-Infotainment if they can purchase just the harness and i think he does that - maybe reach out to him if you want the easy option.

i was running wires for other projects in the truck so i just ran these myself - but it is more work. The infotainment harness has the connectors to plug into the steering column module.

Sorry to bother you again, but i'm assuming that this is the kit;

https://infotainment.com/shop/interior-accessories/infotainment-radio-upgrades/f-bdlrswiper-21l3/

it doesn't specifically say that it fits the lightning, but I'm thinking that its the same parts hopefully. I may just buy the whole kit because it actually comes with the stalk.

 

[jbirdzee]

Sorry for the late response - yes that's the kit. It's the same for the Lightning. But really all you need to do is get three wires up to that connector that plugs into the rain sensor. My truck already had ground on the connector to the rain sensor (probably because it's used for the other modules up there.) I ran the LIN bus wire from the sensor connector back to the steering column control module (That would be PIN 2 of the rain sensor to pin 3 of the steering column control module connector - see below.) I picked up accessory switched power from a project I was doing to add the rear heated seats, but I would think you'd be fine grabbing this from one of the 12V power outlets in the truck.

I am not totally sure where the premade harness gets 12V power from. The steering column control module connector I believe only has a constant power feed, so maybe their T harness is just keeping the rain sensor on all of the time. Doesn't make the most sense to me so I may have missed something there, or maybe it has very low draw or something. I wasn't sure so I hooked mine to the switched to be safe and there have been no issues.

Anyways I hope this helps.

 

[Abominable]

Sorry for the late response - yes that's the kit. It's the same for the Lightning. But really all you need to do is get three wires up to that connector that plugs into the rain sensor. My truck already had ground on the connector to the rain sensor (probably because it's used for the other modules up there.) I ran the LIN bus wire from the sensor connector back to the steering column control module (That would be PIN 2 of the rain sensor to pin 3 of the steering column control module connector - see below.) I picked up accessory switched power from a project I was doing to add the rear heated seats, but I would think you'd be fine grabbing this from one of the 12V power outlets in the truck.

I am not totally sure where the premade harness gets 12V power from. The steering column control module connector I believe only has a constant power feed, so maybe their T harness is just keeping the rain sensor on all of the time. Doesn't make the most sense to me so I may have missed something there, or maybe it has very low draw or something. I wasn't sure so I hooked mine to the switched to be safe and there have been no issues.

Anyways I hope this helps.

Thank you for the excellent information. I will be doing this instead

 

[cam29906]

Sorry for the late response - yes that's the kit. It's the same for the Lightning. But really all you need to do is get three wires up to that connector that plugs into the rain sensor. My truck already had ground on the connector to the rain sensor (probably because it's used for the other modules up there.) I ran the LIN bus wire from the sensor connector back to the steering column control module (That would be PIN 2 of the rain sensor to pin 3 of the steering column control module connector - see below.) I picked up accessory switched power from a project I was doing to add the rear heated seats, but I would think you'd be fine grabbing this from one of the 12V power outlets in the truck.

I am not totally sure where the premade harness gets 12V power from. The steering column control module connector I believe only has a constant power feed, so maybe their T harness is just keeping the rain sensor on all of the time. Doesn't make the most sense to me so I may have missed something there, or maybe it has very low draw or something. I wasn't sure so I hooked mine to the switched to be safe and there have been no issues.

Anyways I hope this helps.

Where is the steering column control module located ?

 

[Entropy]

On my 2024 Lightning Flash, there was no power to the sensor. Thank you @Jesse-Infotainment for the quick turnaround of the harness-only order!

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