2018 Nissan Murano Intelligent Cruise Control Inoperative
This morning I went to a body shop to look at a 2018 Murano. The shop had done a body repair on the vehicle after it had hit a Mule Deer. In the collision, the wires to the Radar module were cut. The body shop soldered them back together and reconnected to the radar sensor. They took it to the local dealer and were told the vehicle needed a new radar module, wiring loom and calibration.
I previously connected to the vehicle with an aftermarket tool and was unable to read all the modules. Last week I received my new Consult tool. Today I connected it to the vehicle to see what was going on. All I found was a U1000 code in the Inteligent Cruise Control Module. I broke out the labscope and connected to the repaired wiring loom. I was able to find a diagram for a 2016 Murano. The radar had been relocated in the 2018 Model but 3 of the wire colors were the same. In connecting to them I determined that the Hi and Lo CAN lines were communicating to the end of the connection. The Power wire was good. The Ground was reading battery voltage. (This is with it disconnected from the Radar module.) The conclusion was that there is an open ground wire somewhere, Since there is battery power on the end that connects to the Radar unit, the ground must serve another load somewhere on the vehicle.
The customer is going to look for the broken, cut or unbolted wire. We can then determine if the Radar unit is bad. It concerns me that the dealer was so quick to condemn the wiring and the Radar. Maybe the shotgun approach is the way they roll now. Since I did not have a service manual, I had to use what I had and improvise my own tests. I am grateful for a labscope. I don't know how else one could determine that there was good signal from the CAN network. I could see that the two signals mirrored each other. I could see that the signal was well formed. A DVOM just can't give all the information that one needs to make a good judgement. I wonder what testing the Dealer did?
After the system has been repaired, it will need to be calibrated. I watched the Hunter videos. Looks expensive and time consuming. The fixtures are also not very transport friendly. Even though I have the factory tool, I don't have a building, alignment rack or the needed fixtures to do the job. Looking at future options to make this happen. This is going to be expensive folks! I hear that calibrations can run as much as $500. Good news for me if I can put it all together.
I known that Nissan does not approve of the repair of SRS circuits, do they approve of the repair of ADAS circuits? I'm wondering if the dealer tech was lazy or following procedure. Why didn't you have SI?
Not sure what Nissan approves of with ADAS wiring repairs. On one hand it is a safety item but the other there is nothing special about it. No Yellow color and basic network and power cabling. I have service information but in the aftermarket solution I have Nissan was only up to 2016. I could have bought a short term subscription to the Nissan site. If the customer does not find the loose ground I guess that would be my next step when he calls for help.
According to SI wire repair is allowed, that being said most things that new I would recommend a harness also.
I did not price it but in SI it looks to be a sub harness, most time they are not that expensive or labor intensive to change.
Have just finished a very high level alignment and calibration class, all alignment angles must be spot on. Being in the green valley is not good enough. Two days was spent on this.
Next the calibrations can be performed, if the alignment is spot-on. The vehicle's calibration of the different safety features will be correct.
We discussed some of the legal aspects of incorrect alignments and calibrations. Short cuts could potentially lead to some very serious legal matters if there is an accident with injuries.
In my opinion, proceed with caution or pay to have it done correctly.
I'm trying to understand "the green valley". Are you saying that the instructor said the vehicle has to be perfectly aligned and within toleration specs is not acceptable?
Were they talking about a specific system or a generalised system kind of like how ASE puts a hypothetical vehicle together for the Hybrid test?I don't think many people are taking the legal side of it into consideration. I'd love to hear a panel of lawyers talk on this. Guessing it would be scary.
Bob, we were taught that more than 7 minutes off of a degree to be out of tolerance. That the thrust vector line would be in another lane at certain distances. Like looking to the right too much not seeing enough on your left.
This throw off lane departure, adaptive cruise, radar and ladar. In our discussions this miscalibrations and lack of customer understanding puts the tech/shop at risk. The term business decision came up many times. Afraid to sell the $500.00 calibrations compared to set the toe and go. The later is going to be a bad choice based on the conversations that we had.
Taking care of the communication issue is my objective at this point. Once there is communication, it is going to the dealer to calibrate. At some point I want to add the calibrations to my offerings. Having a facility available and all the targets / alignment tools will be part of this.
Power, ground and communications.
If there is a gateway make sure that the GW recognize all the modules. If regular CAN verify pin fit and drag.
Hhope this helps.
The ground for the radar is E213 and it is bolted behind the bumper cover above the drivers fog light from the looks of the picture.
The module looks to only have 4 wires power, ground and the 2 comm wires
I would rescan it with the C3+ and use the can diag tab to be sure what is not talking
The radar units themselves dont seem to enjoy being smacked, when I get them if the bracket is bent we recommend the sensor also
After setting a few of them up it really does not take long to do the calibration
The customer pulled the bumper and we were able to repair and verify the ground. Now we have power, ground, CAN Hi and CAN Lo. The radar was hit and there is no comm. We are condemning the radar.
I have not seen one yet that got hit the bracket was not bent
We do a new bracket and radar on almost everyone