B2373

Code

Other B — Body

LED #1 Circuit Short to Battery

Brand: Other

Type: B — Body

Views: UK: 30 EN: 35 RU: 19

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Page language: EN

Causes

Short in wiring harness to battery voltage (pinched, chafed, or contact with positive conductor)
Failed LED lamp or integrated LED driver with internal short to battery
Corroded or damaged connector causing battery feed to leak into output circuit
Faulty control module or LED driver output transistor shorted to battery
Aftermarket accessory or recent repairs that connected power to the lamp circuit
Blown or incorrect inline resistor or diode in LED circuit

Symptoms

LED #1 remains continuously on or does not respond to switch/command
Related lighting function behaves erratically or does not turn off
Illuminated warning on dash for lamp circuit or module
Intermittent operation that may change with vibration or moving harness

What to check

Retrieve freeze frame and related DTCs with a scan tool; note lamp status and vehicle conditions
Visual inspection of LED #1, wiring harness, and connectors for damage, corrosion, or aftermarket splices
Check fuses and fusible links for the lighting circuits
Backprobe the LED #1 output with a multimeter to measure voltage with lamp commanded off and on
Wiggle test harness and connectors while observing meter/scan data for intermittent shorts
Inspect nearby components or accessories installed recently that could tap into power

Signal parameters

Expected off-state: LED driver output near 0 V (≤0.5 V) or high impedance; measured fault: ~battery voltage (≈12–14.5 V)
Expected on-state: driver output may supply battery or regulated voltage or PWM (varies by vehicle) — typically 5–14 V depending on design
Short condition: stable near-battery voltage regardless of command; intermittent short may show voltage spikes or dropouts
Current draw: higher than normal on affected circuit when short present; measure lamp current vs spec

Diagnostic algorithm

Read and record DTC and any related codes; note freeze-frame data and clear codes to confirm reoccurrence.
Visually inspect LED #1 lamp, connector, and wiring for heat damage, melting, corrosion, or foreign wiring. Repair obvious damage.
With ignition on and lamp commanded off, backprobe the LED #1 output at the lamp connector. If near-battery voltage is present, suspect short to battery downstream or internal lamp short.
Disconnect the LED lamp assembly. Re-check the circuit voltage at the harness connector with lamp disconnected. If voltage returns to expected off-state, suspect the lamp assembly is shorted and replace it.
If voltage remains at battery with lamp disconnected, trace wiring toward the body control module. Inspect for pinched areas, aftermarket taps, or damaged insulation. Repair any wiring faults.
Perform continuity/resistance checks between the output circuit and battery positive with power removed to locate hard short. Use insulation piercing probes only if safe and allowed by manufacturer.
If wiring and lamp are good, test the control module output using manufacturer diagnostic procedures or substitute a known-good module if available. Do not perform invasive module repairs unless qualified.
After repairs, clear the DTC, cycle power, and verify proper operation through repeated functional tests and a short road test if applicable.

Likely causes

Damaged or pinched wiring near lamp harness
Failed LED assembly/driver internal short
Contaminated or corroded connector allowing power backfeed
Faulty body control module or lamp driver (less common)

Fault status

⚠️ Status

LED #1 circuit detected short to battery. The lamp driver measures battery voltage when it should be off; inspect lamp, wiring, connectors, and driver module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours