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Home / DTC / B259A00 — IR Lamp RH SCG

B259A00 — IR Lamp RH SCG

Detailed page for trouble code B259A00.

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Code

B259A00

HYUNDAI B — Body

IR Lamp RH SCG

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground in the RH IR lamp wiring
  • Open or shorted IR lamp (bulb/LED module)
  • Corroded or loose connector at the lamp or control module
  • Faulty lamp driver or body control module (BCM)
  • Damage to wiring harness (pinched, chafed, rodent damage)

Symptoms

  • Right-side IR lamp does not illuminate or is intermittent
  • Related system warning or message (lighting/diagnostic message)
  • Stored fault code B259A00 and possibly MIL or warning indicator
  • Reduced functionality of systems using the IR lamp (e.g., driver assist or comfort features that depend on IR illumination)
  • Blown fuse (in some cases) or other lamps affected

What to check

  • Retrieve freeze-frame and related codes with an OBD2/diagnostic scanner
  • Visual inspection of RH IR lamp, connector, and wiring for damage or corrosion
  • Check for multiple related B-codes that point to a common module or harness fault
  • Measure supply voltage to the lamp connector with lamp commanded ON and OFF
  • Perform continuity check from lamp connector to module and to chassis ground

Signal parameters

  • Ignition ON, lamp OFF: control pin should be near battery voltage or high-impedance depending on design
  • Lamp commanded ON: control circuit should supply ~12 V or PWM drive to LED module (varies by vehicle)
  • Short to ground fault: control pin measures near 0 V or very low resistance to chassis ground
  • Expected lamp resistance: continuity with reasonable low-ohm value when lamp removed/bench tested (LED modules vary)
  • No communication errors on related module CAN lines when diagnosing (if applicable)

Diagnostic algorithm

  1. Read DTCs and note freeze frame data. Check for additional codes that could identify a common fault.
  2. Perform a visual inspection of the RH IR lamp assembly, lens, connector, and harness for corrosion, loose pins, or physical damage.
  3. With ignition ON, backprobe the lamp connector and measure voltage at the control/power pin while commanding the lamp ON and OFF via scanner or switch. Record readings.
  4. Measure resistance from the control pin to chassis ground with power removed. A very low resistance indicates a short to ground.
  5. Disconnect the RH IR lamp connector. Clear the code and command the lamp ON; if the code no longer returns, suspect the lamp assembly or wiring downstream. If the code remains, suspect wiring or module.
  6. If open/short suspected in harness, perform wiggle tests while monitoring voltage/continuity to locate intermittent failure. Inspect routing for chafing points.
  7. If wiring and connector check good, test or swap the lamp driver/BCM output (if possible) or inspect module for internal damage. Refer to service manual for module test procedures.
  8. Repair or replace damaged wiring, connector, or lamp assembly as required. Reprogram or replace control module only after verifying wiring and lamp are good.
  9. After repair, clear codes and perform functional test cycles and a road test or system test to confirm proper operation and that the code does not return.

Likely causes

  • Pinched/abraded wire contacting chassis ground near RH lamp
  • Corroded lamp connector causing low-voltage path to ground
  • Internal failure in the IR lamp assembly producing short circuit
  • Failed lamp driver transistor in BCM or lighting control module
  • Poor repair splice or aftermarket accessory interfering with circuit

Fault status

⚠️ Status
B259A00 — Right IR lamp circuit: short to ground detected. Inspect RH IR lamp, wiring, connector, and control module for short or fault. Do not assume module failure without verifying wiring and lamp.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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