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Home / DTC / B29E6 — Key switch signal:open timeout

B29E6 — Key switch signal:open timeout

Detailed page for trouble code B29E6.

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B29E6

MITSUBISHI B — Body

Key switch signal:open timeout

Brand: MITSUBISHI
Type: B — Body
AI status
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Page language: EN

Causes

  • Open or broken wiring between ignition/key switch and control module
  • Corroded, loose, or damaged connector at the key switch or ECU/BCM
  • Failed ignition/key switch assembly
  • Blown fuse or relay in ignition power/logic feed
  • Poor battery or low system voltage
  • Water intrusion or foreign debris in switch/connector

Symptoms

  • No crank or intermittent cranking when turning key
  • Accessory or ignition circuits not powering in ACC/ON positions
  • Starter does not engage even with key turned to START
  • Warning lamps or immobilizer/security lamp illuminated or flashing
  • Key position-related functions inconsistent or delayed

What to check

  • Scan for stored/active DTCs and read freeze frame/live data (check key position input and related channels)
  • Verify battery voltage is healthy (12.4–12.8 V at rest; >13.5 V charging)
  • Visually inspect ignition switch, connectors, and wiring for damage, corrosion, or water intrusion
  • Check relevant fuses and relays for continuity and proper operation
  • Probe ignition switch connector with a DVOM or scope while operating key (observe expected voltages)
  • Back-probe ECU/BCM input for key switch signal to confirm it receives the expected voltage transitions

Signal parameters

  • Expected voltage levels: OFF ~0–1 V, ACC/ON ~battery voltage (~12–14 V), START ~battery voltage (may be a pulsed/short duration as starter engages)
  • Signal should switch cleanly between positions within fractions of a second; open condition reads near 0 V or floating/infinite resistance
  • Continuity: closed switch circuits typically show near 0 Ω between relevant pins; open switch shows very high/OL
  • No sustained open condition longer than module timeout (manufacturer-specific; typically seconds)

Diagnostic algorithm

  1. Read DTCs and note freeze frame/live data for key switch input and related modules (BCM/ECU/immobilizer).
  2. Verify battery voltage and fuses/relays for ignition power and control circuits; replace any blown fuses.
  3. Visually inspect ignition switch, steering column area, connectors, and wiring harness for damage, corrosion, or water ingress.
  4. With a DVOM or oscilloscope, back-probe the ignition switch connector and the corresponding ECU/BCM input while operating the key through OFF → ACC → ON → START. Confirm voltage transitions and timing.
  5. If the switch output is correct at the switch but absent at the module, check continuity of the wiring and connectors between switch and module; repair open or shorted wires and secure connectors.
  6. If there is no output at the switch, test the ignition switch assembly for internal contact failure; replace switch if faulty.
  7. If wiring and switch are good but module input never registers the signal, inspect the module connector pins for damage and test the module input circuit (refer to wiring diagrams). Consider module replacement or repair if input circuit is faulty.
  8. If immobilizer/security lamp is active, confirm key transponder recognition with manufacturer tools; rule out immobilizer preventing start.
  9. After repairs, clear codes, verify proper key signal behavior with live data, and perform functional test (start/run vehicle) to confirm the issue is resolved.

Likely causes

  • Wiring harness open/short or connector corrosion at the ignition switch
  • Faulty ignition switch assembly (contacts worn or stuck open)
  • Loose connector or pin pushed out at the BCM/ECU input
  • Blown ignition-related fuse or failed relay
  • Intermittent module input due to water damage or broken wire

Fault status

⚠️ Status
Key switch signal open (no key position input detected within timeout). Check ignition switch, wiring/connectors, fuses/relays, and module input. May prevent crank/engine start or trigger immobilizer warnings.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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