B1576

Code

Other B — Body

Lamp Park Input Circuit Open

Brand: Other

Type: B — Body

Views: UK: 40 EN: 53 RU: 42

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Page language: EN

Causes

Blown fuse for parking/park lamps or BCM input circuit
Burned-out or disconnected park lamp bulb(s)
Broken, corroded or disconnected wiring or connector in the park lamp circuit
Open or damaged ground for lamp circuit
Faulty park lamp switch or multifunction switch
Faulty BCM or lighting control module input circuit

Symptoms

Park/parking lamps do not illuminate
Instrument panel park lamp indicator may be inoperative or incorrect
Related lighting functions (e.g., tail lights) may be affected depending on vehicle wiring
DTC stored and possibly lamp-related warnings on dash

What to check

Retrieve freeze frame and MIL data; confirm B1576 is current or stored
Visual inspection of park lamp bulbs, sockets and wiring for damage, corrosion or disconnection
Check related fuses and fusible links for the park lamp circuit
Inspect connectors at BCM, lamps and multifunction/switch for corrosion, bent pins or poor seating
Measure voltage at park lamp socket with switch OFF and ON
Check continuity from BCM input pin to lamp socket/switch with ignition OFF

Signal parameters

Expected park lamp socket voltage with switch ON: battery voltage (~11–14 V)
Expected park lamp socket voltage with switch OFF: ~0 V (or open, depending on design)
BCM input pin should change state between ON and OFF (voltage transition); stable open indicates break
Continuity from BCM input to lamp/switch: low resistance (typically
Bulb filament resistance (intact bulb) typically low ohms; open circuit indicates burned filament

Diagnostic algorithm

Verify DTC: connect scan tool, confirm B1576 and note freeze frame/conditions (ignition state, lamp command).
Visual inspection: check park lamp bulbs, sockets, wiring harnesses, and connectors for obvious damage or disconnection.
Fuse check: inspect and verify continuity of fuses/fusible links related to park/parking lamps and BCM power/inputs.
Bulb test: remove lamp and test bulb for continuity with a multimeter; replace burned-out bulbs.
Voltage test at lamp socket: with ignition and lights ON, measure voltage at socket; if battery voltage present at socket, problem is upstream (lamp or socket). If no voltage, proceed toward switch/BCM.
Switch test: operate park light switch while measuring voltage at switch output and BCM input. Verify voltage change. If switch output is correct but BCM input sees open, inspect wiring between switch and BCM.
Continuity test: with ignition OFF and battery disconnected if required by manufacturer, measure continuity between BCM input pin and lamp/switch connector. Repair any open circuits.
Connector and ground: check and clean connectors and grounds; verify good ground continuity from lamp ground to chassis and BCM ground.
Wiggle/functional test: with connectors reseated, wiggle harness and operate lights to reproduce fault and identify intermittent open.
If wiring and components test good and BCM input remains open while command applied, consider BCM or lighting module failure — confirm with manufacturer diagnostics and replacement procedures.
After repair, clear codes and verify function under multiple conditions; re-scan to ensure B1576 does not return.

Likely causes

Wiring open between BCM input and lamp/switch (broken wire, connector popped out)
Disconnected or corroded connector at lamp or switch
Failed bulb(s) resulting in open circuit
Blown fuse in lighting circuit
Defective BCM input (less common)

Fault status

⚠️ Status

Lamp Park Input Circuit Open — BCM detected an open (no continuity or no expected signal) on the park lamp input. Park lamps may not illuminate and a lamp circuit DTC is stored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours