B13C6

Code

LAND ROVER B — Body

Trailer position lamps

Brand: LAND ROVER

Type: B — Body

Views: UK: 19 EN: 32 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown trailer or vehicle fuse for position lamps
Failed or burned-out trailer or vehicle lamp bulb(s)
Corroded or damaged trailer-to-vehicle connector pins
Open or shorted wiring in the trailer lamp circuit (vehicle or trailer side)
Poor or missing ground at trailer connector or lamp housing
Faulty trailer monitoring module or BCM output driver

Symptoms

Trailer position (running/parking) lamps do not illuminate when selected
Warning or message on dash indicating trailer lamp fault
Intermittent lamp operation only when trailer wiring flexed
Other trailer light functions may be affected (e.g., marker lamps)
Trailer indicator on instrument cluster may flash or show error

What to check

Visually inspect trailer connector and pins for corrosion, bent pins, or water ingress
Check vehicle and trailer fuses and relays related to lamps
Verify trailer is properly connected and trailer lamps/bulbs are intact
Inspect wiring harness for damage, chafe, or splices in the tow wiring area
Use a scan tool to read BCM/trailer module fault data and freeze frame
Measure voltage at the vehicle trailer connector with lamps ON and OFF

Signal parameters

Voltage at lamp feed pin with lamps ON: approximately battery voltage (~11–14 V)
Voltage at lamp feed pin with lamps OFF: near 0 V (or as specified by manufacturer)
Ground circuit: low resistance to chassis ground (near 0 Ω)
Bulb filament resistance: typical incandescent running lamp filament low ohms (varies by bulb type)
BCM diagnostic PID/IO: output commanded ON/OFF and actual feedback status (if available)

Diagnostic algorithm

Retrieve and record DTC memory and any freeze-frame/snapshot data with a diagnostic tool
Verify whether a trailer is connected; if not, attempt to reproduce fault with a known-good trailer or test lamp assembly
Perform a visual inspection of trailer connector, pins, wiring and lamps for damage or corrosion
Check related fuses and relays; replace any blown fuses and retest
With lights OFF, measure for shorts to battery or ground at the trailer feed pin; with lights ON, measure feed voltage at vehicle trailer connector
Test ground continuity from trailer connector ground pin to vehicle chassis ground
Remove and bench-test suspect lamp bulbs or lamp assemblies; replace bulbs if faulty
If vehicle-side wiring is intact, inspect trailer wiring harness and lamps; repair any damaged wiring or connector pins
Use the scan tool to command trailer position lamps ON/OFF while monitoring BCM output and diagnostic values to determine if BCM output is switching correctly
If BCM/trailer module output is not present despite correct wiring and power, consider module fault and consult wiring diagram before replacing; check for software updates or technical service bulletins
After repairs, clear codes and retest with trailer connected and lights operated; ensure code does not return

Likely causes

Blown lamp fuse or burned-out bulb(s) on trailer
Corroded/trapped pins or damaged trailer connector causing intermittent contact
Open or high-resistance ground at trailer connector
Shorted/grounded wiring in trailer harness

Fault status

⚠️ Status

Trailer position lamp circuit fault detected — inspect trailer connector, lamps, wiring, fuses, and BCM/trailer module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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LAND ROVER

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