PIT5441B

Bulletin No.: PIT5441B
Published date: 07/5/2017
Preliminary Information
PIT5441B Object Detection System Message / Service Active Safety / Front Camera / Adaptive Cruise
Control / Driver Assist System DTCs U0075 U026A U026B U026C U0265 U0268 U0269 Due To MDI Or
Cable Issue
Models
Brand:
Cadillac
Model:
Escalade
VIN:
Model Years:
2015 - 2017
from
All
Engine:
to
All
All
Transmissions:
All
With Driver Assist Package RPO Y66
Supersession Statement
This PI was superseded to add the 2017 model year. Please discard PIT5441A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
While performing normal diagnostics for any of the Object Detection System Message(s) below, the technician may find any of the
following DTCs stored in the active safety module: U0075, U026A, U026B, U026C, U0265, U0268, and/or U0269.
The DTCs can be history or current and when trying to communicate with any of the radars or the front camera, they may or may not
communicate.
This may be the result of an issue with the MDI (Multiple Diagnostic Interface) or MDI cable that is used between scan tool and the DLC
(Data Link Connector).
The Object Detection modules communicate via serial data on the object detection bus, circuits 3813 and 3811. These circuits go to
the DLC at terminals 3 and 11.
The Object Detection bus is new on the Escalade models starting in 2015. Because of this, the MDI/cable may have never or rarely
accessed the object detection bus.
If parts of the MDI or MDI cable that are used to access the object detection bus on DLC terminals 3 and 11 have developed an issue, it
could cause these false U-codes as well as no communication with the radars and/or front camera.
This can easily mislead the technician when diagnosing any of the following Object Detection System Messages:
- Service Active Safety Service
- Service Front Camera System
- Lane Departure Warning
- Service Driver Assist
- Rear Auto Braking
- Service Auto Collision System
The MDI/Cable will work correctly when accessing other communications busses such as High Speed Lan (DLC terminals 6 & 14), Low
Speed Lan (DLC terminal 1), and Chassis Bus (DLC terminals 12 and 13).
Recommendations / Instructions
To determine if the MDI/cable is working correctly try using it in another Escalade with the Driver Assist Package RPO Y66, which does
not have any issues.
Try to communicate with the radars, forward camera, and check the active safety module for DTCs.
If it is also setting false U-codes and the scan tool is unable to communicate with the radars and/or front camera, the MDI/Cable has an
issue and needs to be replaced or repaired.
If available, another MDI/cable can be evaluated, but remember, just because it is a different MDI/Cable does not mean that it is good.
Performing the above test on another Escalade will validate the MDI/cable is operating correctly.
If the MDI/cable was the cause of the DTCs, these DTCs are most likely false and should not be used when trying to diagnose the
customer's original complaint.
All DTCs should be cleared and the vehicle should be driven to duplicate the customer's original complaint and then a good MDI/cable
should be used to check for DTCs and perform diagnostics.
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