FOUND Power Management Control ECU FAILED TO CONTROL ENGINE ROOM JUNCTION BLOCK ASSEMBLY VIA PIN 8 (BL) TO PIN 9 (BLPS-1P) TO FINAL OUTPUT CURRENT PIN 1 (BKLP-1M) TO REAR LIGHT ASSEMBLY LH, RH (BACK-UP LAMPS), BYPASSED THE ENGINE ROOM JUNCTION BLOCK ASSEMBLY TO CONNECT COMMAND CURRENT (R) COMING FROM E73(B) Shift Lever Position Sensor PIN 4 blue wire, input to Power Management Control ECU A39(B) PIN 14 (R) TO LINE (BKLP) COMING FROM Integration Relay (Engine Room Junction Block Assembly 1-1M COLOR SKYBLUE, conclusion : before some technician worked on rear camera view circuit which related to buck-up lamp circuit directly because two of them sharing same command current line, maybe affected Power Management Control ECU so becomes disabled to energize the command current line going to ENGINE ROOM JUNCTION BLOCK ASSEMBLY to energize inside relay to output finally to rear buck-up lamps LH, RH, We've reported to Customer that Power Management Control ECU need to be replaced, but he asked on his responsibility and to match his budget to bypass the command current line if will not affect other system/s, we execute the job on his responsibility after explaining technical details suitable to understand what will do in his vehicle, finished and tested, no more complains.
Attached here related photos and videos on google drive :
https://drive.google.com/drive/folders/1vV11d2TmpYK3OxZw8N0mmQ8M8qM6ppSs?usp=sharing