Code
B145D
LAND ROVER
B — Body
Proximity sensor power supply - Circuit 1
Views:
UK: 2
EN: 5
RU: 0
AI status
Completed
Completed
100%
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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