03/09/2025
2021 Jeep Truck Grand Cherokee 4WD
V6-3.6L
Note :
To get to Engineer mode press VOLUME & TUNE buttons at same time for 15 seconds then release and wait for RADIO restart.
before replacing engine hood battery and when cycle switch off/on RADIO display ACCESSORY GAUGES and other information, after problem arises, when cycle switch off/on RADIO open in menus other than ACCESSORY GAUGES, this confused the customer experience.
Problem started with wrong engine hood battery replacement procedure.
Warning lamps on dashboard.
Somebody tried to fix the issue, case getting worse.
Vehicle bought to our centre https://www.facebook.com/AutomotiveAdvancedDiagnosticCentre/ Removed cluster, engine coolant temperature needed to reset after disassemble the cluster, corrected reading after fixed approximately, RADIO losing accessory gauges display when cycle switch off/on, return back to different setting every time, found B1488-00 RADIO - Cabin EQ Mismatch Performance, after thoroughly searching found Cabin EQ at ecu configuration at FCA GATEWAY for BCM is 4E while same number for RADIO is 00 ! generating mismatch case every time switch cycle off/on, according to analysis from service manual, part/s need to be replaced and programmed after reflashing control modules especially BCM & RADIO to solve mismatching situation, but from analysis BCM need to be replaced and programmed because no fault codes related to BCM, uploaded case to automotive forum : https://diag.net/msg/m3nx8taerg6yg74vcam8ljerqg
for more investigations.
So case is open for discussion for more information sharing.
for more photos and videos related to case please refer to : https://drive.google.com/drive/folders/1EX6X5yRFx056l5eSC0YnnRjAm2zPfK-S?usp=sharing