When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
That's part of the battery monitoring system. Unplugging prevents battery data from being sent to the ECM which then will not engage start/stop as a fail-safe.
Problem is that there are other systems involved.
On other JLR vehicles, there are better ways to do it that only turn off start/stop. I did it on an XF and an F-Pace under the dash. No idea on a Defender and I don't care bcs, to me, start/stop has been improved to the point where it doesn't bother me.
Going through the workshop manual with a search for "battery monitor" will show other systems affected by the BMS.
Last edited by _Allegedly; Nov 28, 2021 at 05:55 PM.
That's part of the battery monitoring system. Unplugging prevents battery data from being sent to the ECM which then will not engage start/stop as a fail-safe.
Problem is that there are other systems involved.
On other JLR vehicles, there are better ways to do it that only turn off start/stop. I did it on an XF and an F-Pace under the dash. No idea on a Defender and I don't care bcs, to me, start/stop has been improved to the point where it doesn't bother me.
Going through the workshop manual with a search for "battery monitor" will show other systems affected by the BMS.
Agree on the stop/start - my P400 has one of the best implementations I've experienced. Much better than the stop start on my last XJ and on the BMW that I sold when I got my Defender. On the other cars the stop/start was rough, and the air conditioning would stop working while the engine wasn't running. With the Defender, it's unobtrusive.
Agree on the stop/start - my P400 has one of the best implementations I've experienced. Much better than the stop start on my last XJ and on the BMW that I sold when I got my Defender. On the other cars the stop/start was rough, and the air conditioning would stop working while the engine wasn't running. With the Defender, it's unobtrusive.
I remember in one of the Jags that there was a 3 or 4 wire plug that connects to a module next to the fuse panel. This wire supplies power to the start/stop system.
Unplugging it throws an error when the car is started. Something like "start/stop not available" but that clears and no other systems are impacted.
No idea if the Defender has a similar set-up but it would be in the good book if it does. Just have to find it.
