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Home / DTC / B2412 — LF antenna power voltage

B2412 — LF antenna power voltage

Detailed page for trouble code B2412.

34,405codes
59brands
11,914generic
22,491specific
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Code

B2412

MITSUBISHI B — Body

LF antenna power voltage

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

Causes

  • Blown fuse or tripped relay supplying antenna power
  • Open or short in antenna power/ground wiring or poor connector contact
  • Corroded or water-damaged LF antenna unit
  • Faulty body control module (BCM) / immobilizer ECU driver output
  • Low battery or intermittent battery connection causing unstable supply
  • Aftermarket equipment or recent repairs damaging the harness

Symptoms

  • Keyless-entry or passive entry may not detect the key near the left-front door
  • Doors may not unlock/lock reliably from the key fob at left-front position
  • Immobilizer or security warning lamp may illuminate or flash
  • Intermittent communication or intermittent DTCs related to antenna or immobilizer
  • Possible reduced functionality of convenience features tied to LF antenna

What to check

  • Scan for additional related codes and note freeze-frame data
  • Visually inspect LF antenna, connector and harness for corrosion, water intrusion or damage
  • Check relevant fuses and relays for continuity and signs of overheating
  • Measure vehicle battery voltage to confirm stable 12–14 V supply
  • Backprobe antenna power and ground pins while exercising the system (key present/active)
  • Check continuity between antenna connector and BCM connector; look for shorts to ground or 12V

Signal parameters

  • Expected antenna supply voltage: ~11–14 V when system/ignition or antenna supply enabled
  • Expected voltage near 0 V when supply is intentionally off (system inactive)
  • Ground continuity: near 0 Ω between antenna ground and vehicle chassis ground
  • Supply wire continuity: low resistance from BCM output to antenna connector (< a few ohms)
  • No excessive ripple or intermittent dropouts when measured with key present

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data with a capable scan tool; record conditions when DTC set.
  2. Inspect LF antenna and harness for visible damage, corrosion, or water ingress; repair as needed.
  3. Verify battery voltage and check/replace any blown fuses or faulty relays in antenna/BCM circuits.
  4. Backprobe the LF antenna power pin while activating the system (use scan tool active tests or approach with key) and measure voltage; compare to expected range.
  5. Check ground at antenna connector for low resistance to chassis ground; repair poor ground connections.
  6. Measure continuity and resistance of the power feed and return between antenna and BCM; isolate sections to locate opens/shorts.
  7. If wiring and connectors are good, disconnect antenna and measure antenna unit resistance per service manual; replace antenna if out of spec.
  8. If antenna and wiring test good, check BCM output driver for proper operation (observe voltage output, check for shorts). Consider swapping BCM or bench-testing only if other steps fail and OEM procedures allow.
  9. After repairs, clear codes and perform functional test (walk-by/key approach, lock/unlock operations) and confirm code does not return.
  10. If intermittent, perform road/park tests and extended monitoring with scan tool to confirm repair.

Likely causes

  • Blown or corroded fuse for antenna/BCM power
  • Loose, corroded or disconnected connector at LF antenna
  • Damaged power supply wire (open or short to ground/12V)
  • Faulty LF antenna module
  • BCM/immobilizer output transistor failure

Fault status

⚠️ Status
LF antenna power voltage abnormal — the body control module detected the LF antenna supply voltage is outside expected range (open/short/low/high). Inspect fuses, wiring, connectors, antenna unit and BCM.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2410 B2411 B2413 B2420 B2799 U0100
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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