B145D

Code

LAND ROVER B — Body

Proximity sensor power supply - Circuit 1

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 21 RU: 5

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Page language: EN

Causes

Blown fuse or faulty relay supplying the proximity sensor power circuit
Open or damaged wiring between module and sensor (broken wire, connector corrosion)
Short to ground or short to battery on the sensor power feed
Poor or missing ground at the sensor or control module
Faulty proximity sensor(s) drawing excessive current or internal short
Faulty body control module (BCM) or parking aid module

Symptoms

Parking aid / proximity warning not working or disabled
Warning lamp or message on dash related to parking aid or sensors
Inconsistent or intermittent sensor operation
Possible fault stored in instrument or BCM memory

What to check

Scan for stored & pending DTCs in BCM/park aid module; view freeze frame/live data
Visually inspect sensor connectors and harness for corrosion, water ingress, physical damage
Check related fuses and relays for continuity and correct operation
Backprobe sensor power connector; measure supply voltage with ignition on and system active
Measure continuity and resistance between sensor power pin and module power output
Check ground integrity at sensor and module (voltage drop test)

Signal parameters

Expected supply voltage: approx. 11–14 V at sensor power pin with ignition on and system active
Ground reference: ~0 V at sensor ground pin (low resistance to chassis ground)
Typical sensor supply current: low (usually tens of mA); significant increase indicates internal short
Open-circuit: infinite/very high resistance between module and sensor power feed
Short-to-ground: near 0 Ω between power feed and ground when fuse removed (verify safely)

Diagnostic algorithm

Use a suitable diagnostic tool to read all related DTCs and confirm B145D is current or historical.
Visually inspect the affected sensor(s), connector(s) and harness for corrosion, damage or water entry. Repair any damage found.
Check applicable fuses and relays for the proximity/parking aid power circuit. Replace if blown or faulty.
Backprobe the sensor power pin with ignition on and system active. Confirm expected battery voltage (≈11–14 V). If voltage absent, trace back toward module.
If voltage present at harness but module reporting fault, measure voltage at module power output and compare. Check for intermittent drops while moving harness.
Perform continuity/resistance checks between sensor power pin and module power output with ignition off. An open indicates wiring break; low resistance to ground indicates short.
Check ground(s) used by the sensor and module. Perform voltage drop test under load to confirm good ground path.
Disconnect suspect sensor and check if fault clears. If removing a sensor clears the code and supply returns to normal, suspect sensor internal fault or water ingress.
If wiring and sensors test good, consider module supply driver fault. Verify wiring pins and connectors, then consult repair manual for module replacement or reprogramming procedures.
After repair or replacement, clear codes and perform a functional test and sensor calibration/relearn per manufacturer procedure.

Likely causes

Corroded/mis-seated connector at sensor or module
Damaged wiring harness where it flexes or near body panels
Blown inline fuse or failed relay feeding the sensor circuit

Fault status

⚠️ Status

Proximity sensor power supply circuit 1 - supply voltage out of range or circuit fault detected by control module. May indicate open, short, intermittent supply or ground fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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B145D — Proximity sensor power supply - Circuit 1