The Rear Cross Traffic Alert and/or Side Blind Zone Alert system (Fig. 14) on some 2021-2023 Tahoe, Suburban, Yukon and Escalade models may not detect certain vehicles. A “system unavailable” message also may be displayed on the Driver Information Center.
Fig. 14
If vehicles are not detected properly, it may be due to the incorrect installation of one or both of the left/right Side Object Detection Control Modules in the rear bumper fascia bracket. (Fig. 15, #2)
Fig. 15
The Side Object Detection Control Modules have an internal antenna that emits a signal (radar wave) that is used to detect vehicles nearby. The modules must be installed correctly for the system to work as designed.
If the modules are not detecting certain vehicles, check that the modules are not installed on the wrong side of the vehicle, upside down, backwards or flipped over. Typically, the module are found to be installed incorrectly after there has been some type of repair work done to the vehicle.
For example, if the Side Object Detection Module is flipped over (Fig. 16), the module’s internal antenna that emits the radar wave will be pointed inward toward the passenger compartment. Despite the module being mounted incorrectly and pointing in the wrong direction, the system may still have some partial functionality.
Fig. 16
When installed correctly, the Side Object Detection Module label will point toward the front of the vehicle. (Fig. 17)
Fig. 17
When diagnosing a performance-related issue with the Rear Cross Traffic Alert and / or Side Blind Zone systems, first verify the proper installation of the left and right Side Obstacle Detection Control Modules. Review the appropriate Service Information for additional information.
Refer to #PIT6087 for more details.
– Thanks to Jim Will
or, module will face inside vehicle. not outside.