Backup Camera Guidelines missing

[Sixox74]

Did you tow anything or tap into the trailer lighting circuit for extra lighting? around the time the grid lines disappeared.
If the truck sees or thinks a trailer is connected, the grid lines will not display so check the trailer plug and harness at the bumper.

The Grid Lines come from the camera and control of those lines comes from the information the BCM is receiving for steering angle input along the HS1-Can network and transmits this data via the LIN circuit back to the camera from the BCM.
So, you have a COM issues, as I suspect that if you lost Steering Angle Input, you would have codes generated for other modules, such as ABS.


If the dealer is washing their hands of this, I would scan for codes and:

Pull Fuse #23 in the BJB (Engine Bay) for 5-Minutes
If no help:
1. Perform BCM - Self Test
2. SCCM - Self Test
3. APIMP - Self Test
4. New LIN Module Initialization

Live Data:
Look at the Steering Angle (PID's)
Reverse Input (PID's)
If these PID's are normal, then it's a COM issue between the BCM & Rear Camera or internal BCM itself.
From here its wiring checks and or pull & reseat connectors between the BCM & Camera as the LIN circuit is dead between them.
There are 4 total connectors that can be producing the issue for the LIN circuit, if that LIN circuit checks good then you need to look at possibly disconnecting the trailer harness as that circuit may be causing the issue.
BCM: C2280D
Inline: C1147 - Drivers Side Footwell
Inline: C408 - Along the Left Frame (Most -Aft Connector) this will be the most likely connector
Rear Camera Connector:

This is Awesome information thank you I will get them to try next service.

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