Oillybob55
Member Since: 12 Jul 2020
Location: Bradford
Posts: 42
  
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Good evening
Today I spent time looking at the issue I have with the parking sensors on my 2007 disco, it has front and rear sensors and when I start the disco I get a short burst from the sensor speaker and then the LED light flashes on the dash button. I ran a diagnostic and got two fault codes B1B57 and B1B58 both power circuit faults. From the searches I have done it lead me towards there been a fault with a sensor so I have stripped the rear bumper and checked the loom, all power and grounds are good I have an issue with one cable on the o/s corner but I thought that would show up as a sensor fault not a power fault on the diagnostics. So I checked the module was getting power and it was but I also checked it was sending power to the sensors and it’s not so is it safe to assume it’s the module that’s at fault?
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 19th Jul 2020 8:27 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10367
 
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so that means there is a short beween brown and black wires
either at the front or rear.
I would disconnect the front loom. (it easy below the headlight I think)
1. measure the resistance of the front bumper loom and note. btw black and brown.
leave disconnected.
clear the fault codes.
power the ignition up and select reverse and P brake off.
Do those short fault codes return? if yes, fault on rear bumper. (measure rear bumper loom and note. btw black and brown.)
You will get 4 front fault codes as its unplugged.
Once you can see a front or rear bumper with low resistance between black and brown, unplug each sensor in turn until the resistance goes up a lot. That then is the faulty sensor
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| 19th Jul 2020 8:32 pm |
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Prette
Member Since: 16 Mar 2020
Location: Previously Stoke-ST4 (pre-pandemic), Mostly The Hague (NL) partially Lyngby (DK) certainly somewhere
Posts: 160
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Oillybob55 wrote:I ran a diagnostic and got two fault codes B1B57 and B1B58 both power circuit faults.
+1 on what Pete K said.
I had exactly the same fault coded. It was a short-cut sensor in the front bumper. Apparently, if there is a short-cut everything is off.
Unfortunately, the only way to know which is faulty is by removing one by one. I took one by one and measured their input resistance, the different one was the faulty, swapped it and all sorted.
Good luck and keep us updated.
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| 19th Jul 2020 11:10 pm |
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