Multiple Systems Failure on Dash (2014 LX570) (1 Viewer)

[lcmui2033]

I need some help on troubleshooting the multiple system failure on my dash. No CEL. Just certain systems not working:

No reverse camera
No speedometer
No odometer
No AHC
No CRAWL control
No cruise control
Only functional feature on multi-display is tire pressure

Dashlight ON:
VGRS - sometimes
PCS - sometimes
Emergency Brake - constant ON
Traction Control - constant ON
AFS - flashing

So far I only checked the fuse box by the driver battery. Battery is at 12.6v (engine off) / alternator is at 13.7v (engine on). I’m thinking it is a fuse in 1 of the 4 fuse boxes in the car. Just want to see if anyone experience this before.

 

[AnyMal]

No speedo is a new one to me.
Hopefully a fuse but my guess is something expensive died. First thing is check codes, you may find some failure or commonality.

Water intrusion or anything recenlty?

 

[linuxgod]

I'd have to go back through the FSM but I'm pretty sure the speedometer is driven by CANbus communications and the speed is calculated by averaging the wheel speed sensors.

Water intrusion would be my first guess, given there are several different sensors and ECUs involved. Pop off the plastic sills up front to see if there's any water.

 

[Sandroad]

I'd have to go back through the FSM but I'm pretty sure the speedometer is driven by CANbus communications and the speed is calculated by averaging the wheel speed sensors.

Water intrusion would be my first guess, given there are several different sensors and ECUs involved. Pop off the plastic sills up front to see if there's any water.

This ^^^^. I'll add to the guess about water in the wrong place. Sunroof drain plugged or bad windshield seals?

 

[DenverLX]

My 16' LX had the error lights come on like a Christmas tree a while back, my truck went into limp mode too. It turned out to be just a low battery, switched it out and everything worked fine. I would have never imagined a low battery would cause such a cascade of problems...

 

[lx200inAR]

I would start with checking codes with Techstream. We can see for sure the the AHC ECU either doesn't have power, or it's network connection is failed. Evidenced by the H/N/L display for height missing in the dash. There is a "network gateway ecu" that handles the communication between different data buses in the truck. Possibly an issue with that. I believe the AHC failure would trigger the AFS light, because AFS uses some of the sensors from that system. Seems like the skid control ecu manages the speedometer.

Also, I second starting the truck again with a new battery, or at least with a charger attached to provide a little more voltage at startup.

 

[doru]

Start with new battery, or at least have current one properly tested and charged.
Modern cars and trucks go haywire when the battery is "low". Low can mean many things that are better expressed by battery malfunction.
I had this kind of experience on all my cars newer than 2003.

 

[Sandroad]

The OP already noted the battery voltage with engine off and alternator voltage when running. While I know those are not valid battery tests and it’s a good idea to check battery connections anyway, those voltages are good enough for me to start the troubleshooting elsewhere.

 

[LTSR]

Get the battery load tested, it's typically free at your local auto parts store. It's free and easy just to rule it out.

 

[Scott Hinckley]

Did you ever resolve this? I have dissimilar symptoms but as you I had a large list of seemingly unconnected features and systems stopped functioning all at once. As you had my battery tests fine but everyone seems to insist it is likely the issue.