Jeep Grand Wagoneer 2023–2025 — technical service bulletin
Bulletin 9100629 · NHTSA communication 11021571 · issued Jul 28, 2025
Technical service bulletin
communication type
Electrical System
component
2023–2025
model years
6
vehicle entries
Official summary
Before replacing the Headlamp Switch, due to an issue on the Dimmers. Please follow the next steps to corroborate if the Headlamp Switch is malfunctioning: 1.- Please disconnect and reconnect the headlamp Switch. And verify if the issue is corrected. If it is the Instrument panel Dimmer (Right Dimmer) 2.- Review the resistance value between Pins 6 & 3. The value should be around 5.76 KOhms, when in the lowest position to 311 ohms in the top position (Parade Detent). If it is the ambient light dimmer (Left Dimmer) 2.- Review the resistance value between Pins 8 & 3. The value should be around 14
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.