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Home / DTC / B2472 — Off hook button stuck

B2472 — Off hook button stuck

Detailed page for trouble code B2472.

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Code

B2472

MITSUBISHI B — Body

Off hook button stuck

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

Causes

  • Mechanical button physically stuck or jammed
  • Contaminants (dirt, sticky residue) causing the switch to remain closed
  • Worn or internally failed switch/contact
  • Shorted wiring (short to ground) or short to power in the switch circuit
  • Poor or corroded connector at the switch or module
  • Faulty steering wheel remote/control switch assembly or harness damage

Symptoms

  • Hands‑free telephone appears always 'off‑hook' or stays active
  • Unable to place or receive calls using hands‑free system
  • Telephone system stuck in call state, microphone disabled or audio routing incorrect
  • Intermittent or constant DTC B2472 present
  • Possible increased accessory battery drain if circuit remains active
  • Related steering wheel controls not functioning or erratic

What to check

  • Retrieve freeze frame / stored data with a diagnostic scanner to confirm when DTC set
  • Visually inspect the off‑hook button and surrounding trim for physical jams, contamination or damage
  • Operate the off‑hook button while watching scanner input for the button state change
  • Check connectors at the switch and at the body/telephone module for corrosion, loose pins or bent terminals
  • Inspect wiring harness through the steering column for chafing, exposed conductors or damage
  • Measure continuity/resistance of the switch with the connector disconnected (verify open/closed states)

Signal parameters

  • Normal (rest) state: switch open (module sees high or pull‑up voltage).
  • Activated state: switch closed (module sees low/ground).
  • Typical voltage at switch connector (with ignition ON): ~12 V or pull‑up voltage when open, ~0 V when closed (verify against vehicle service data).
  • Expected resistance: open = OL/infinite, closed ≈ 0–5 Ω (verify with service specs).
  • Scan tool should show discrete change in input state when button is pressed and released.

Diagnostic algorithm

  1. Connect a compatible scan tool and confirm DTC B2472 and any related codes. Record freeze frame/data.
  2. With ignition ON, observe the live input/data for the off‑hook switch while pressing and releasing the button. Note if input changes.
  3. Visually inspect the button, bezel and surrounding trim. Operate button repeatedly to check for sticking or intermittent action.
  4. Remove trim/steering‑wheel covers as needed to access the switch connector. Inspect connector and wiring for corrosion, damage or loose pins.
  5. With connector disconnected, measure switch continuity while actuating the button. Compare to expected open/closed values.
  6. Check circuit for short to ground or short to battery: with ignition OFF, measure resistance from switch signal wire to ground and battery (+) as directed by service manual.
  7. If wiring is intact, test through the clock spring (if present) per service procedure — inspect for intermittent continuity when steering turned.
  8. If switch or steering‑wheel control module fails bench tests, replace the switch assembly or control unit per manufacturer procedure.
  9. After repair, clear DTCs and recheck system operation. Confirm code does not return after repeated button operation and vehicle drive cycle.
  10. If code persists after replacing switch and repairing wiring, consider replacing/testing the body/telephone control module or consult advanced diagnostics/service literature.

Likely causes

  • Steering‑wheel mounted telephone/off‑hook switch mechanically stuck from debris or wear
  • Pinched or chafed wiring in the steering column causing a short to ground
  • Corroded connector at the switch or at the body/phone control module
  • Internal failure in the switch assembly (contacts welded or shorted)
  • Fault in the steering wheel clock spring causing a permanent contact

Fault status

⚠️ Status
Off‑hook (telephone) button circuit reported stuck/continuously closed. Check switch, wiring and connectors.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2470 B2471 B2473 B2474 B2475
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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