B2500 Courtesy Lamp Output Check Short to Battery

OBD2 Code: B2500

Description: Courtesy Lamp Output Check Short to Battery

Definition: The OBD2 code B2500 indicates a malfunction in the courtesy lamp circuit, specifically a short to battery. This means that there is an unintended connection between the courtesy lamp output and the battery voltage, which can cause the lamps to remain on continuously or behave erratically.

B2500 – Courtesy Lamp Output Circuit Short to Battery

Typical severity: Moderate

Common Causes

B2500 – Courtesy Lamp Output Check Short to Battery

Common causes:

• Faulty courtesy lamp switch
• Short circuit in the wiring harness
• Defective Body Control Module (BCM)

Common Misdiagnosis

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OBD2 Code: B2500

Description: Courtesy Lamp Output Check Short to Battery

Common Misdiagnosis: Replacing the courtesy lamp bulb or fixture without checking for wiring issues.

Common Diagnostic Steps

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OBD2 Code: B2500

Description: Courtesy Lamp Output Check Short to Battery

• Inspect the courtesy lamp circuit for any visible damage or corrosion.
• Check all related fuses and replace any that are blown.
• Use a multimeter to test for continuity in the courtesy lamp wiring harness.
• Examine connectors and terminals for loose connections or signs of overheating.
• Test the courtesy lamp switch operation to ensure it is functioning correctly.
• If equipped, check the Body Control Module (BCM) for fault codes or malfunctions.
• Repair or replace any damaged wiring, connectors, or components as necessary.
• Clear the code from the vehicle’s computer system and perform a road test to verify repair success.