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2020 Discovery Parking Sensors & Blind Spot Monitor Malfunctioning

0

Mike T. · rep 0 · May 25, 4:44 AM · 1 replies · solved · Question

Vehicle: 2020 Land Rover Discovery HSE Luxury

Hi all,

I'm having some intermittent issues with the driver-assist systems on my 2020 Land Rover Discovery HSE Luxury. Specifically, the front and rear parking sensors are acting up – sometimes they work fine, other times they're completely unresponsive or give false alarms when nothing is near.

In addition, the Blind Spot Monitor (BSM) on the driver's side has been erratic. It occasionally throws a fault message, or the warning light in the mirror stays on even when no vehicle is present. I haven't seen any specific OBD codes pop up on my basic scanner, but it's making parking and lane changes a bit nerve-wracking. Has anyone experienced similar problems with their Discovery?

Any ideas on what could be causing this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:44 AM

0

ClearTheCode admin answer:

Intermittent issues with parking sensors and the Blind Spot Monitor (BSM) on your 2020 Land Rover Discovery HSE Luxury often point to sensor-related problems or communication faults within the vehicle's electrical network.

Common Causes:

  1. Dirty/Obstructed Sensors: The most straightforward cause. Parking sensors and BSM radar units are typically located in the bumpers. Dirt, mud, ice, or even a small bump can obstruct or misalign them, leading to erratic behavior. Even a thick coat of wax can interfere.
  2. Faulty Sensors: Individual parking sensors or the BSM radar units can fail internally. Being exposed to the elements, they are prone to moisture ingress or physical damage over time.
  3. Wiring Harness Damage: Rodent damage, corrosion, or physical damage to the wiring leading to the sensors can cause intermittent connections, leading to system faults.
  4. Module Communication Issues: The control modules for these systems (e.g., Parking Aid Module, Blind Spot Monitoring Module) communicate over the vehicle's CAN bus. Glitches or faults in these modules or their communication can cause widespread issues.
  5. Software Glitches: Sometimes, a software update or reset of the relevant control modules can resolve intermittent electronic issues.

Troubleshooting Steps:

  1. Inspect Sensors: Visually inspect all parking sensors (small circles on bumpers) and the BSM radar units (usually behind the rear bumper corners) for dirt, damage, or obstructions. Clean them thoroughly.
  2. Check for DTCs (Advanced Scanner): While your basic scanner might not show codes, a more advanced diagnostic tool (like those used at dealerships) can often pull specific B-codes (Body codes) related to parking aid sensors (e.g., B1B70 - Parking Aid Sensor Fault) or BSM modules.
  3. Battery Health: Ensure your vehicle's battery is in good health. Low voltage can sometimes cause various electronic systems to behave erratically.

When to See a Shop:

  • If cleaning the sensors doesn't resolve the issue.
  • If you suspect a faulty sensor, as replacement often requires bumper removal and recalibration.
  • If diagnostic trouble codes (DTCs) are present that point to specific module or wiring faults. A Land Rover specialist has the tools to accurately diagnose module communication issues, wiring integrity, and perform necessary recalibrations or software updates.
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