Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
Rear parking sensors occasionally not activating
I'm starting to have a problem with my rear parking sensors not activating when reverse gear is selected.
Sometimes, when reverse is selected, there is no 'beep' from the rear parking sounder, and the parking system LED does not activate on the centre console.
Occasionally, 'wiggling' the gear selector gets it to activate so I has thought that there must a a failing microswitch somewhere.
But took a look at the wiring and electrical description and seems I could not be more wrong.
Click image to enlarge
Seems the parking module is activated via the CANbus from the TCM when reverse gear is selected; doesn't really explain why a gentle 'wiggle' sometimes kicks the parking aid into life but does explain why a 'wiggle' doesn't always work.
Everything else about selecting reverse seems to work ok; lights come on, instrument cluster display changes.
Anyone got any experience or insight into this type of error?
Was going to say that there wasn't anything to find in scanning with my IID tool, but forgot I hadn't reset since I shorted everything last week, so had just about every fault known to Land Rover show up.
Andy
19th Jan 2019 2:57 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10367
There is a software bug like this.
But won’t reakky explain why it getting worse.
19th Jan 2019 6:08 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
Software bug? Is there a tsb?
19th Jan 2019 6:16 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10367
Yeah. I think it just says fit new ecu of different part number.
19th Jan 2019 7:12 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
Thanks Pete, found it with a bit of digging.
Click image to enlarge
Wonder if I need to take a look at my speed sensors at some point.
19th Jan 2019 10:10 pm
Dazz360
Member Since: 03 Sep 2016
Location: West Mids Walsall
Posts: 871
like to know the outcome of this as i had exactly the same with my old manual 05 plate SE, only way to get them on was to open drivers door and shut it. Also moving to neutral the back to reverse Metal auto sump & fluid change (3 hrs)
LR door puddle projectors (10 mins)
Tinted Bonnet wind deflector (10 mins)
All Intercooler pipes and Tbolts (2hrs)
3 injectors replaced so far (30mins)
Sunroof drain pipes both sides 2.5 hrs)
Rear discs, shoes,pads,callipers,flexi hoses, rigid brake line, n/s upper hub carrier bush and rear n/s upper arm (13hrs over 2 days)
19th Jan 2019 10:41 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
What I’m thinking is using my IID tool to see what the speed sensors are reporting when the car is still.
If I understand it correctly, the TCM sends notice on the CANBUS that it’s gone into reverse, and the parking assist module picks up on that.
If the two conditions are reverse gear and stationary, given I’ve got no CANBUS errors, then perhaps it’s one of the speed sensors?
Will see what I get when I get the time I guess.
19th Jan 2019 11:42 pm
XDAndy
Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597
Oh, thought I'd post an update.
Figured out what was going on.
For the sensors to activate, the car has to be at a complete stop.
I'd gotten so used to the car and its size, that I was letting it roll, so wasn't coming to a stop, so sensors never engaged.
If you don't get the beep, put your foot on the brake and wait.
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