If the 2019 Frontier is the same as the 2018, according to the FSM, it's located inside the passenger compartment underneath the driverside dashboard to the left of the steering column. To access it you have to remove the knee panel cover just below the steering column. Looking at the FSM drawing, the Differential Lock Control Unit, (as it's referred to in the FSM), is mounted somewhat high up to a metal bracket - that metal bracket being attached to the vehicle metal frame bracing on the left side underneath the dash.

This is the closest I could find of a picture of it references a Nissan Parts webpage... but it only covers the 05-12 model years....
nissan Frontier Control Unit Differential Lock. Controller Transfer - 28496-EA31A | NISSAN, RICHMOND VA

Have you checked for an open / shorted wire(s) running to the back / rear differential solenoid lock valve?? A search of the Web didn't pull up much info on this code....

Code C1187: ABS Differential Lock Controller

The Anti-Lock Brake System (ABS) Module monitors the ABS Differential Lock Controller. The ABS Module sets the OBDII code when the ABS Differential Lock

www.autocodes.com

Order Factory Nissan Parts & Accessories | Nissan RVA

Keep your Nissan vehicle running at its best by using only original OEM parts.

parts.nissanrva.com

Anyhow, hope it helps.... Good Luck!!

 

If the 2019 Frontier is the same as the 2018, according to the FSM, it's located inside the passenger compartment underneath the driverside dashboard to the left of the steering column. To access it you have to remove the knee panel cover just below the steering column. Looking at the FSM drawing, the Differential Lock Control Unit, (as it's referred to in the FSM), is mounted somewhat high up to a metal bracket - that metal bracket being attached to the vehicle metal frame bracing on the left side underneath the dash.

This is the closest I could find of a picture of it references a Nissan Parts webpage... but it only covers the 05-12 model years....
nissan Frontier Control Unit Differential Lock. Controller Transfer - 28496-EA31A | NISSAN, RICHMOND VA

Have you checked for an open / shorted wire(s) running to the back / rear differential solenoid lock valve?? A search of the Web didn't pull up much info on this code....

Code C1187: ABS Differential Lock Controller

The Anti-Lock Brake System (ABS) Module monitors the ABS Differential Lock Controller. The ABS Module sets the OBDII code when the ABS Differential Lock

www.autocodes.com

Order Factory Nissan Parts & Accessories | Nissan RVA

Keep your Nissan vehicle running at its best by using only original OEM parts.

parts.nissanrva.com

Anyhow, hope it helps.... Good Luck!!

Being I work out of town during the week really takes my time, but I plan on tracing down the harness tomorrow looking for opens.

The oddity is that I only started having this issue after my rear right brake caliper exploded. After replacement I was thinking it probably knocked the sensor out of whack, but from what I can tell it is still functioning just fine.

Thanks for the insight!


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Not sure if you have access to a Factory Service Manual, but you can download a copy from the websites below. Yeah....it's NOT the 2018 model year, (the closest is 2016), but hopefully if Nissan hasn't changed too much in the design, then the info in the 2016 should work for the 2018.

Nissan Service Manuals - NICOclub

NICOclub.com purchases, downloads, and maintains a comprehensive directory of Nissan Factory Service Manuals for use by our registered members. While we wouldn’t prevent anyone from using this information, we’d hope you would appreciate our efforts enough to frequent the forums here, rather than...

www.nicoclub.com

If you want 2018 specific, then you can access the AllData website - it's the one professional mechanics use in their repair shops but it's the D-I-Y version. A month's subscription will run you $19.99 but you can download and access as much info as you want in that time frame. The AllData access is a hella lot cheaper than if you purchase the FSM CD from Nissan. Nissan's FSM CD will set you back $200+ dollars and is a pain in the *** to use.... Nissan in their infinite wisedom linked it to Microsoft Internet Explorer with ActiveX controls, (FYI Internet Explored is no longer supported by Microsoft - they upgraded to Edge). You can get it to run in Microsoft Edge but you have to change the browser setting in Edge to run in Internet Explorer Legacy Mode.... It's a shame Nissan couldn't keep the FSM in the same format as the 1st Gen FSM CD's. Those were much easier to use than these new 2nd Gen FSM CD's. Anyhow, here's the link for AllData

Do It Yourself Automotive Repair Information | ALLDATA DIY

Single-vehicle access to OEM diagnostic and repair information for the student and the do-it-yourself mechanic. Includes wiring diagrams, TSBs, DTCs. Powered by ALLDATA.

www.alldata.com

Forgive the stupid question, but HOW did you get the right rear brake caliper to explode?? Oh wait...never mind....it's NOT as rare as I thought.. Someone else, (Ford forum), blew theirs up too!!

Brake Caliper exploded

I was on my way home from picking up my trailer at my buddies house. I get ready to slow down to pull into my drive. I hit the brakes and then it happens. The pedal goes to the floor. I slow down enough to safely pull into my driveway. Pull back to my shop unhook the trailer and then back up...

www.powerstroke.org

Anyhow, according to my '19 FSM the rear differential solenoid lock valve is actually located on the upper portion of the rear differential on the driver side. Any possibility that when the caliper exploded that a piece of shrapnel cut or nicked one of the signal wires running to the differntial solenoid? If it did, lets just hope it's easy to spot & fix. Running diagnostics on signal wires is a MAJOR pain-in-the-a**!!! Let's just hope it's something simple to repair & you DON"T have to trace wires & test solenoid(s) to find the cause of your C1187 code. Good Luck!!🤞🤞🤞

 

Not sure if you have access to a Factory Service Manual, but you can download a copy from the websites below. Yeah....it's NOT the 2018 model year, (the closest is 2016), but hopefully if Nissan hasn't changed too much in the design, then the info in the 2016 should work for the 2018.

Nissan Service Manuals - NICOclub

NICOclub.com purchases, downloads, and maintains a comprehensive directory of Nissan Factory Service Manuals for use by our registered members. While we wouldn’t prevent anyone from using this information, we’d hope you would appreciate our efforts enough to frequent the forums here, rather than...

www.nicoclub.com

If you want 2018 specific, then you can access the AllData website - it's the one professional mechanics use in their repair shops but it's the D-I-Y version. A month's subscription will run you $19.99 but you can download and access as much info as you want in that time frame. The AllData access is a hella lot cheaper than if you purchase the FSM CD from Nissan. Nissan's FSM CD will set you back $200+ dollars and is a pain in the *** to use.... Nissan in their infinite wisedom linked it to Microsoft Internet Explorer with ActiveX controls, (FYI Internet Explored is no longer supported by Microsoft - they upgraded to Edge). You can get it to run in Microsoft Edge but you have to change the browser setting in Edge to run in Internet Explorer Legacy Mode.... It's a shame Nissan couldn't keep the FSM in the same format as the 1st Gen FSM CD's. Those were much easier to use than these new 2nd Gen FSM CD's. Anyhow, here's the link for AllData

Do It Yourself Automotive Repair Information | ALLDATA DIY

Single-vehicle access to OEM diagnostic and repair information for the student and the do-it-yourself mechanic. Includes wiring diagrams, TSBs, DTCs. Powered by ALLDATA.

www.alldata.com

Forgive the stupid question, but HOW did you get the right rear brake caliper to explode?? Oh wait...never mind....it's NOT as rare as I thought.. Someone else, (Ford forum), blew theirs up too!!

Brake Caliper exploded

I was on my way home from picking up my trailer at my buddies house. I get ready to slow down to pull into my drive. I hit the brakes and then it happens. The pedal goes to the floor. I slow down enough to safely pull into my driveway. Pull back to my shop unhook the trailer and then back up...

www.powerstroke.org

Anyhow, according to my '19 FSM the rear differential solenoid lock valve is actually located on the upper portion of the rear differential on the driver side. Any possibility that when the caliper exploded that a piece of shrapnel cut or nicked one of the signal wires running to the differntial solenoid? If it did, lets just hope it's easy to spot & fix. Running diagnostics on signal wires is a MAJOR pain-in-the-a**!!! Let's just hope it's something simple to repair & you DON"T have to trace wires & test solenoid(s) to find the cause of your C1187 code. Good Luck!![emoji1696][emoji1696][emoji1696]

Finally and update of the situation,

Took it into the dealer for a diagnostic, they’ve determined the Diff Control Unit is faulty along with the rear end being “bad”. Hearing back from ASC Warranty, (third party I bought with vehicle purchase) they only determined damage with the control unit and no obvious damage with the diff as there being no material in the diff and fluid looking clean.

I am in agreement with the warranty company as the reason the dealer gives for total replacement is “rear diff is always locked”. This does not make sense to me as the truck has in no way felt locked for the 800 miles I’be driven the truck with the intermittent issue.

My question now is if you guys think its logical that if the harness is good, then the only other issue would be a bad sensor? I’ve purchased an AllData license and have looked at the exploded drawing of the diff, is there a video you recommend to accompany it?

Either way, the diff control unit will be installed by Thursday this week and I’m going to be picking it up (tired of crappy communication with the dealer) and will be trying to solve the issue myself.

Also, apologies for the bad description, by my caliper exploding, I mean the cylinder seal going bad and profusely leaking fluid on the rotor as well as anyone tailgating me! Not as cool sounding as flying shrapnel xD


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