Jebiruph
Well-Known Member
- Thread starter
- #1
When my 2018 JLU was at the dealers for the steering stabilizer recall, I asked about updating the radio firmware to fix some issues I was having (5" radio). They updated the PCM, ABS and radio firmware. Yesterday I noticed the low speed surging was gone, so today I tested starting with aux battery disconnected and it started.
Here's the write up for the firmware update.
Before the update when I tried to start with the aux battery disconnected, the dash would continually cycle on and off and never try to start. I believe this is due to a starting process aux battery test that fails (dash off), then the process restarts (dash on) and this continues over and over as long as the button is pressed.
After the update when starting with the aux battery disconnected, the dash goes off one time and after it comes back on it starts. Then after it starts it shows a start/stop error. This is the same thing my 2020 JT does, the dash turns off once, then turns back on and starts.
It looks like the updated firmware is designed to only test the aux battery one time.
Here's the write up for the firmware update.
Before the update when I tried to start with the aux battery disconnected, the dash would continually cycle on and off and never try to start. I believe this is due to a starting process aux battery test that fails (dash off), then the process restarts (dash on) and this continues over and over as long as the button is pressed.
After the update when starting with the aux battery disconnected, the dash goes off one time and after it comes back on it starts. Then after it starts it shows a start/stop error. This is the same thing my 2020 JT does, the dash turns off once, then turns back on and starts.
It looks like the updated firmware is designed to only test the aux battery one time.
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