Code
B2410
MITSUBISHI
B — Body
Rear antenna(indoor) open
Views:
UK: 17
EN: 20
RU: 16
AI status
Completed
Completed
100%
Causes
- Broken or disconnected antenna coax/lead
- Corroded or loose connector at antenna or radio head unit
- Failed active antenna amplifier (internal to antenna or separate module)
- Blown fuse or loss of power to active antenna bias
- Damaged wiring harness (chafing, cut, water ingress)
- Poor ground or connector corrosion
Symptoms
- Weak or no AM/FM reception at rear speaker zones
- Intermittent radio reception or static
- Navigation or phone systems using the rear antenna may have reduced performance
- B2410 DTC stored; no other drivability effects
What to check
- Confirm customer complaint and attempt to reproduce poor reception
- Check for other related DTCs in the audio/body modules
- Visually inspect rear antenna, mounting, and connector for damage or corrosion
- Inspect antenna coax along its routing for cuts, pinches, or water ingress
- Check related fuses and power supplies for the antenna (radio/accessory fuses)
- Unplug and reseat antenna and radio connectors; check for bent pins
Signal parameters
- Antenna coax continuity: should show continuity between radio antenna pin and antenna element; open = infinite resistance
- Shield continuity: low resistance to chassis ground for coax shield
- Active antenna bias voltage: typically ~11–14 V (12 V systems) or ~5 V for some bias circuits — consult vehicle wiring
- No DC present on passive antenna feed (depends on system); verify expected voltage per wiring diagram
Diagnostic algorithm
- Verify battery voltage and attempt to reproduce the fault with the radio on. Note any intermittent behavior.
- Read and record B2410 and any other audio/body module codes. Clear codes and see if B2410 returns to confirm persistency.
- Visually inspect rear antenna assembly and connector for corrosion, water entry, or physical damage. Repair or replace damaged parts.
- Check and replace any blown fuses related to the radio/antenna circuit.
- With radio on, measure bias voltage at the antenna feed pin at the head unit connector. Compare to expected value from wiring diagram.
- Disconnect the antenna connector at the head unit and measure continuity from the head unit antenna pin to the antenna connector at the body/roof. An open indicates wiring or connector fault.
- If continuity is good and bias voltage is present but no reception, suspect failed active antenna amplifier or antenna element — bench-test or swap with known-good unit if available.
- Repair wiring or replace antenna/amplifier as required. Reseal any entry points to prevent water ingress.
- Reassemble, clear codes, and road-test/operate radio to confirm repair. Re-scan for codes to ensure B2410 does not return.
Likely causes
- Open or disconnected coaxial connection between radio and rear antenna
- Failed active antenna amplifier (open output)
- Corroded connector or water-damaged antenna assembly
- Blown antenna feed fuse or missing antenna bias voltage
Fault status
Status
Rear antenna (indoor) circuit open — check antenna, amplifier, connectors, wiring and related fuses.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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