Thread: Radar cruise control?

Several UK owners of late L322s have activated autonomous braking by enabling queue-assist in the CCF even though LR didn't have it as an option. I've set my CCF to have queue assist enabled primarily to get autonomous braking rather than just forward alert with brake pre-arming, although even just forward alert seems like a good feature. ACC in earlier L322 and L320 RRS apparently wasn't too great when approaching trucks in adjoining lanes or on bends but I've encountered no bad comments for MY10+ RR/RRS.

My ecm is back about 4 update levels so I would get that updated if any untoward behaviour occurs before backing away from queue-assist. I'll not be relying on autonomous braking in queues until satisfied that it's operating well and even then doubt that I'll use it.

If you have an iidtool or other tool capable of full ccf editing then give it a try. The L322 CCF has a few parameters that have to be changed but it would be good to know what particular options are set in the current L405. EG my ccf has multiple options (eg gen1/gen2/gen3) for 2 parameters. My ccf's queue assist parameters are:
collision mitigation by braking ( CMbB ) - enabled
speed control - ACC queue
speed control - adaptive speed control, stop and go
collision mitigation by braking - GEN1
forward collision warning - GEN1

My selection of GEN1 is because another L322 MY12 TDV8 with factory fitted ACC with queue assist subsequently enabled has GEN1 specified for those 2 parameters.

ACC is now working. I noticed that the flashing icon had gone after exiting the local tip that has 2 sets of steel gateway posts, so stopped, locked then restarted. Indeed, queue-assist / stop-and-go now works although I didn't encounter a situation where another vehicle or an animal would be expected to trigger autonomous braking without CC enabled. I used the shortest gap setting for traffic and up to 80 kph and the longest setting for the open road with only a lone vehicle ahead.

An unexpected benefit is that the gearbox now down-shifts on inclines when CC set for 100 kph, whereas previously top gear was held until around 1000 rpm then the gearbox would downshift several gears. I suspect a bug in the ECM's standard CC logic.

Graeme, I assume to enable autonomous braking I'd need to add some hardware at the front of the car as you have - is that correct? (I assume I cant just enable the automomous braking using my IID tool?
regards
Chris

The radar unit, mounting bracket and short link harness will be required, as is required for ACC. I don't know if the steering wheel left switch bank with the ACC gap increase/decrease switches is a prerequisite to activating ACC, but as they're quite useful when using ACC then best to fit them anyway.
The radar unit is quite expensive new but can be purchased ex ebay UK quite cheaply, just be sure to purchase a unit with the correct number on the label to avoid having to get the correct firmware from Gap.

Do you think it's feasible for D4?

Scott

That would greatly depend on whether ACC was an option on the particular model D4.

Graeme

You stated you need the following bits to upgrade the manual cruise control

ACC ecu LR025949 (mounts in RR of cargo area)
primary radar unit YDB500560 (left side)
mounting bracket LR012689 - FOUND IT
secondary radar unit LR029157 (right side) GOT IT
mounting bracket LR022947 GOT IT
radar link harness LR023028 WAITING ON IT
left steering wheel switch bank (vin BA349700+) LR029644 GOT IT

Do we definitely need all of this. I was told we only need the bits I have or waiting on.

Regards
Craig

The rear ecu, left radar unit and link harness to link the 2 radar units together are only for the 5.0 engine.