Some 2021 Tahoe, Suburban, Yukon and Escalade models may have a Service Theft Deterrent message on the instrument cluster and several DTCs set, including: B113C (Security Indicator Control), B13AC (Lane Departure Warning Indicator Control), B1AC3 (Ignition Mode Switch LED Control), B195D (Left Rear Door Lock Indicator Control), B195E (Right Rear Door Lock Indicator Control), U3018 (Control Module Supply Circuit 1-2 Not Plausible), and/or U3501 (Control Module Supply Circuit 1 Low Voltage). In addition, fuse F49DR in the right instrument panel fuse block will be open.
If these conditions are found, remove the 12-volt accessory power outlet (APO) X80H, which has an LED illuminated ring around its perimeter (Fig. 32, #1), and inspect the grounding tab for the illuminated ring.
Fig. 32
The LED illuminated ring is part of the 12-volt APO receptacle retainer and there are two contact tabs (Fig. 33, #2 and #3) for the illuminated ring.
Fig. 33
The two contact tabs for the LED illuminated ring mate to the 12-volt APO receptacle. Tab #2 is for power to illuminated ring circuit 6817 and tab #3 is the ground, which should only contact the outer metal body of the 12-volt APO receptacle. (Fig. 34, #6)
Fig. 34
If tab #3 is improperly formed or is bent or damaged, it can short out between the metal body and the slide contact for tab #2 (Fig. 35, #4). Tab #3 should only contact the metal body of the 12-volt APO receptacle.
Fig. 35
With the 12-volt APO X80H removed, inspect the grounding tab. If the tab is shorting out between the metal body and slide contact, replace the 12-volt APO receptacle retainer.
Refer to #PIT5800 for additional information.
– Thanks to Jim Will
