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Discussion Starter · #1 ·
Been reading through the manual and think I found a way to disable the Stop / Start system I think.

ITEM DESCRIPTION
1 Battery Junction Box (BJB)
2 Quiescent Current Control Module (QCCM)
3 Rear Junction Box (RJB)
4 Voltage Quality Module (VQM) - Stop/Start system only
5 Startup battery
6 Battery Monitoring System (BMS) control module

Automotive parking light Automotive tail & brake light Motor vehicle Automotive lighting Hood


VOLTAGE QUALITY MODULE - VEHICLES WITH STOP/START SYSTEM ONLY

E174480

Font Auto part Gas Technology Electronic device


ITEM DESCRIPTION
1 Voltage Quality Module (VQM)
2 Power connector
3 Ground connector
4 Signal connector
The Voltage Quality Module (VQM) is located adjacent to the Rear Junction Box (RJB) in the right side of the luggage compartment. The VQM is attached to the rear floor with three bolts. The VQM consists of a Direct Current (DC) - DC converter and an interface. This interface provides the communication with the Body Control Module/Gateway Module (BCM/GWM) assembly.

The DC - DC converter can produce a constant 12 V output voltage from the varying input voltage supplied by the battery during an engine restart. This constant 12 V output voltage is needed for the crucial vehicle systems.

The VQM supplies a constant voltage during an engine restart for the following:

The Instrument Cluster (IC)
The Quiescent Current Control Module (QCCM)
The infotainment system components - Depends on equipment
The Rear View Mirror (RVM) - If equipped
The Parking Assist Control Module (PACM) - If equipped
The Rear View Camera (RVC) - If equipped
The left and right Blind Spot Monitoring Control Module (BMCM) - If equipped.
The VQM has three connections:

Two power connectors:
A startup battery feed connection from the Battery Junction Box (BJB) via a 60 A fuse.
A power output connection to the Rear Junction Box (RJB) and to the Quiescent Current Control Module (QCCM).
An additional connector to provide electrical connection to the following:
Ignition signal from the BCM/GWM assembly.
Crank signal from the starter motor relay located in the left Engine Junction Box (EJB).
Status and diagnostic messages to the BCM/GWM assembly via the Local Interconnect Network (LIN) bus.
Ground.
 

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Discussion Starter · #2 ·
Some more information I found:

Stop Inhibitors

The following conditions will prevent the auto stop/start system from stopping the engine.

Driver effected stop inhibitors:

Driver disables the auto stop/start system
Brake pedal not fully pressed
Accelerator pedal pressed
Hood is open
Driver door is open
Driver seatbelt is not fastened
Climate control system used above calibrated threshold
Windshield demist is operating
Trailer electrical connection detected.
Vehicle system effected stop inhibitors:

Brake booster vacuum below threshold
Battery cold cranking capability below threshold
Battery state of charge is low
Catalytic converter outside either pre or post calibration range
Engine coolant temperature below threshold
Engine oil temperature below threshold.
Environmental effected stop inhibitors:

Ambient air temperature above 40°C (104°F)
Ambient air temperature below 0°C (32°F)
 

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Discussion Starter · #4 ·
It wont let me grab it from the Land Rover Site.... Let me know what you need in particular and Ill save it down.
 

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Discussion Starter · #7 ·
mth75 said:
I'm looking for information about the

ACTIVE REAR LOCKING DIFFERENTIAL

How can I check the differential is in the car when delivered. Thx!
Here you go. If you read through it, the ones with the active rear locking Differential have a module in the rear left side.

Active

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Module

Automotive lighting Rectangle Font Auto part Metal


Non Active

Automotive lighting Automotive tire Font Auto part Automotive mirror


Here is the link with the PDF

https://www.dropbox.com/s/0itfwbn1ykpkcpg/Rear%20Diff.pdf?dl=0
 

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I'm just wondering does the lock symbol in the image (on the rear drive axle) indicate that the rear electrical (active) differential is present or does this symbol also show in the none active variant?
 

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Discussion Starter · #12 ·
if I am not mistaken it should be the active rear end since it has the ability to be locked but don't 100% quote me on that
 

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Discussion Starter · #13 ·
It is possible to disable the start / stop system but it has to be done every time you start up the car unlike BMW which allows you to disable start / stop system to remember the last setting.
 

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mge.92 said:
It is possible to disable the start / stop system but it has to be done every time you start up the car unlike BMW which allows you to disable start / stop system to remember the last setting.
Ah, I see, that I didn't know. Thx for clarification.
 

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Discussion Starter · #16 ·
Never liked the system even when I had it on my BMW X3. The amount of fuel you save versus the shudder and wear and tear on your engine is not worth it.
 

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mge.92 said:
Never liked the system even when I had it on my BMW X3. The amount of fuel you save versus the shudder and wear and tear on your engine is not worth it.
Did you ever manage to disable the stop/start system?

Thanks,
Chris
 

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Discussion Starter · #18 ·
Not yet sadly
 

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I'm pretty certain there's no way to permanently disable the auto stop/start function through software.

JLR have deliberately left this out of their system even though it is a basic feature people clearly want and the effort required on their part to fix it in software would be trivial.

Looking at the f-pace forums, others have worked around this by disconnecting the signal lead from the voltage quality module in the rear of the car:
https://www.jaguarforums.com/forum/f-pace-x761-c-x17-87/disengage-auto-stop-start-2017-f-pace-167370/

This effectively disables the auto stop/start function as, according to topix, it relies on a signal from the VQM to ensure sufficient battery power is available for repeated engine starts without affecting the operation of the vehicle systems.

From what I can tell, there is no reason why the above would not work on the Velar as well. Personally, I think this is an effective way to solve the problem but it's not a clean/neat/hassle free solution.

I've recently been reading up on the message bus systems used in modern cars, some of which can be accessed through the OBD port - you may have seen people using Bluetooth OBD2 connectors to diagnose or display engine data on their iPad etc.

If the software button to disable/enable the auto stop/start function sends a message over the bus then it would be possible to program a custom OBD2 device to send an identical message, say 20 seconds after engine start, using something like this:
https://freematics.com/pages/products/freematics-one/

If that works then it would be a pretty neat solution, easy to install and remove and easy to build for others. Just an idea right now but I do hope to look into it when I get some time. Not sure if anyone else is really that interested in this approach but i'll definitely post back if it works.
 
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