01499 – Right high beam headlamp bulb – open circuit/short circuit to B+ (Volkswagen)

Volkswagen-specific code — factory diagnostic data

Last updated: March 31, 2026

Definition source: Volkswagen factory description · Autel MaxiSys Ultra & EV. Diagnostic guidance is based on factory-defined fault logic for this code.

01499 means your Volkswagen has a fault in the right high-beam headlamp circuit, so the right high beam may not work when you need it. You may also see a bulb-out warning on the dash. According to Volkswagen factory diagnostic data, this code indicates: “Right high beam headlamp bulb – open circuit/short circuit to B+.” In plain terms, the control unit sees the right high-beam output as electrically wrong. It either cannot “see” the bulb load at all, or it sees battery voltage where it should not. That matters because the fix depends on wiring tests, not guesses.

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01499 Quick Answer

01499 points to an electrical fault on the right high-beam lamp circuit: an open circuit or a short to battery positive (B+). Confirm the bulb, connector, and wiring integrity before replacing any control module.

What Does 01499 Mean?

Official definition: “Right high beam headlamp bulb – open circuit/short circuit to B+.” In practice, the right high beam may stay off, work intermittently, or act abnormally. The vehicle sets this code when the lighting control logic decides the right high-beam circuit does not match a normal lamp load and commanded state.

What the module checks and why it matters: On Volkswagen platforms, the lighting controller (often part of a body electrical module) drives the right high-beam output and monitors the circuit’s electrical behavior. It expects a predictable current draw and voltage response when it commands the high beam on or off. An open circuit points to a broken filament, loose terminal, high resistance, or a break in wiring. A short to B+ means the output wire or lamp feed gets battery voltage from an unintended source, which can backfeed the control unit and confuse monitoring.

Theory of Operation

Under normal operation, the Volkswagen lighting controller switches power to the right high-beam bulb and monitors the output. When the driver commands high beams, the module supplies voltage to the lamp circuit and expects current flow through the filament. When the driver turns high beams off, the module expects the output to drop and the current to stop.

This code sets when the controller sees electrical behavior outside its allowed window. An open circuit produces little or no current draw when the module commands ON. A short to B+ produces battery voltage present on the output when the module expects it to be off, or it produces abnormal feedback during self-tests. Those two failure modes require different pinpoint tests at the bulb and at the module output.

Symptoms

These are the most common signs drivers and technicians see with 01499 on a Volkswagen.

• Right high beam inoperative even though the left side works
• Bulb-out warning or exterior lighting warning message on the cluster
• Intermittent operation of the right high beam over bumps or during moisture
• High beam indicator on the dash behaves normally while the lamp stays dark
• Unexpected glow or faint illumination from backfeed on the right side
• Related lighting DTCs stored for other front lighting outputs if a shared feed or ground has issues
• Failed output test for the right high beam when commanded with a scan tool

Common Causes

• Open filament or failed high-beam bulb: A burned filament breaks current flow and the Volkswagen module flags an open circuit.
• High resistance at the right headlamp connector: Heat, fretting, or spread terminals raise resistance and the module interprets the load as incorrect.
• Corrosion in the headlamp housing or connector seals: Moisture intrusion corrodes terminals and creates an intermittent open or unstable load signal.
• Harness damage near the radiator support or headlamp bucket: Chafing or a pulled harness opens the circuit or lets the feed contact B+ where it should not.
• Short to B+ on the lamp control wire: A rubbed-through control wire can touch a constant battery feed and the module detects a short-to-battery condition.
• Poor ground path for the right headlamp circuit: A loose ground eyelet or corroded ground point reduces current and mimics an open circuit to the controller.
• Incorrect bulb type or aftermarket LED conversion without proper load: A low-current load changes the expected current draw and can trigger an “open circuit” style fault on Volkswagen lamp monitoring.
• Faulty headlamp power/lighting control output stage: An internal driver fault can stop supplying current or backfeed voltage and set the circuit fault after wiring checks pass.

Diagnosis Steps

Use a scan tool that can access Volkswagen body/central electrics data, plus a DMM, a test light, and back-probing leads. Keep a fused jumper wire and a known-good bulb available. Plan to perform voltage-drop tests under load. Gather wiring diagrams for the right high-beam circuit on the 2013 Caddy.

1. Confirm DTC 01499 and record all stored and pending codes. Review freeze frame for battery voltage, ignition state, and any lamp-command status available. Freeze frame shows conditions when the module set the fault. Use a scan tool snapshot later to capture live lamp command and load status during an intermittent event.
2. Perform a fast visual inspection before meter work. Check the right headlamp lens for water entry, inspect the bulb seating, and look for overheated plastic at the connector. Follow the harness from the headlamp to the main loom and check for chafing at brackets and the radiator support.
3. Check the related fuses and power distribution for the exterior lighting system. Verify fuse integrity with a loaded test method, not continuity alone. A fuse can pass continuity and still fail under load due to cracked elements or poor contact tension.
4. Verify controller power and grounds under load. Command the high beams on and voltage-drop test the module grounds. Keep ground drop under 0.1 V with the circuit operating. Also voltage-drop test the module power feed to ensure the driver has stable supply while loaded.
5. Use the scan tool output test (if available) to command the right high beam on. Observe measuring blocks for lamp status, load recognition, and any “open load/short to B+” indicators. A hard fault on a continuously monitored lamp circuit usually returns immediately at key-on or during the output test.
6. At the right high-beam bulb connector, check for the correct power feed behavior with the lamp commanded on. If voltage appears correct, load the circuit with a test light or a known-good bulb to see if the supply collapses. A supply that reads normal unloaded but drops under load points to high resistance in wiring, terminals, or grounds.
7. Check the ground side at the headlamp connector with a voltage-drop test while the bulb is lit. Place the meter between the bulb ground terminal and the battery negative. Excessive drop confirms a ground path issue even if continuity looks good.
8. If the code description includes “short circuit to B+,” test for unwanted battery voltage on the control wire when the lamp should be off. Disconnect the bulb and inspect whether the lamp feed remains powered. A constant B+ at the lamp with the output commanded off suggests a short to battery in the harness or a stuck driver.
9. Isolate harness versus module output. Disconnect the headlamp connector and the module-side connector for the lamp output, as service information allows. Check for continuity to B+ on the lamp control wire with the circuit de-energized. If the wire shows B+ feed presence with both ends disconnected, find the chafe point where it contacts a power source.
10. Inspect terminals closely and correct fit issues. Perform a pin-drag test on the connector terminals and look for green corrosion or heat discoloration. Clean and repair terminals as needed, then retest with the bulb installed and commanded on.
11. Clear codes and run the output test again. If the fault immediately returns, treat it as a hard fault and repeat isolation checks. If it does not return, perform a road test with high beams cycled and use a scan tool snapshot to capture lamp command and load status when the concern occurs.

Professional tip: Do not trust resistance or continuity checks on lamp circuits by themselves. A corroded terminal can pass a continuity test and still fail under load. Use voltage-drop testing with the high beam commanded on, because this code tracks circuit behavior, not just wire integrity.

Possible Fixes

• Repair connector or terminal tension at the right headlamp: Clean corrosion, replace overheated terminals, and ensure proper pin fit to restore correct current flow.
• Repair damaged wiring or insulation: Locate chafed sections, repair with proper splices, and restore harness routing and abrasion protection.
• Restore ground integrity: Clean and tighten the headlamp ground point, then confirm low voltage drop under load.
• Replace the right high-beam bulb only after verifying power and ground: Install the correct bulb type and confirm the module recognizes the proper load.
• Remove incompatible LED/HID conversions or add an approved load solution: Return the circuit to a load the Volkswagen monitoring logic can validate.
• Replace or repair the lighting control output stage only after circuit isolation: Confirm the harness tests good and the output remains incorrect before condemning a control module.

Can I Still Drive With 01499?

You can usually drive a 2013 Volkswagen Caddy with DTC 01499, but you should treat it as a night-time safety problem. This Volkswagen manufacturer-specific code points to the right high beam bulb circuit showing an open circuit or a short to B+ (battery positive). If the right high beam does not work, you lose forward visibility and distance lighting. That raises risk on dark roads, in rain, or at highway speeds. If the circuit shorts to B+, the lamp control output can stay powered. That can overheat wiring, damage the headlamp unit, or drain the battery. Avoid driving at night until you confirm correct high beam operation and verify the wiring does not heat up.

How Serious Is This Code?

This code ranges from inconvenience to a real safety concern. If the fault acts as an open circuit, you often see a dead right high beam and a dash bulb warning. Daytime driving may feel normal, but night driving becomes unsafe. A short to B+ carries higher risk. It can backfeed power into the lighting circuit and keep the lamp on or partially powered. That condition can overheat connectors and stress the Volkswagen body electrical module or lamp driver. It can also create odd lighting behavior, such as the high beam indicator not matching the actual lamp. Treat any melted plastic smell, warm connectors, or stuck-on high beam as urgent.

Common Misdiagnoses

Technicians often replace the bulb or headlamp assembly first and stop there. That wastes time when the real issue sits in the right headlamp connector, a rubbed-through harness near the radiator support, or water intrusion in the lamp housing. Another common miss involves misreading the fault type. The FTB -010 subtype maps to SAE J2012DA fault text, so it matters whether the controller flags “open circuit” versus “short to battery.” Do not skip circuit checks. Also avoid condemning the body control module without proving the output driver lacks control and the circuit does not backfeed B+ through an aftermarket splice.

Most Likely Fix

The most frequently confirmed repair direction involves fixing the right high beam circuit integrity, not immediately replacing modules. Start with a verified-good bulb and inspect the right headlamp connector for heat damage, looseness, or corrosion. Next, find and repair wiring damage that creates an open or a B+ short, especially where the harness flexes or contacts sharp edges. If the wiring and connector pass load testing and the circuit still shows a B+ short behavior, then test the Volkswagen lamp driver output at the control module for a stuck-on condition before considering module repair or replacement.

Repair Costs

Repair cost depends on whether the confirmed root cause is wiring, connector condition, a sensor, a module, or the labor needed to diagnose the fault correctly.