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Home / DTC / B1574 — PS.cut SW open for N.O

B1574 — PS.cut SW open for N.O

Detailed page for trouble code B1574.

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Code

B1574

MITSUBISHI B — Body

PS.cut SW open for N.O

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

Causes

  • Open circuit in PS cut switch wiring
  • Faulty or mechanically stuck PS cut switch
  • Corroded or loose connector at the switch or control module
  • Blown fuse or poor power/ground supply to the switch circuit
  • Water intrusion or physical damage to harness near steering column
  • Faulty steering control module / ECU

Symptoms

  • EPS / power steering assist warning lamp illuminated
  • Reduced or lost steering assist (heavier steering effort)
  • Related engine or traction control intervention in some models
  • Stored B1574 code and possible additional steering-related faults
  • Intermittent loss of assist correlated with steering angle or vibration

What to check

  • Read and record DTC(s) and freeze frame data with a diagnostic scanner; note conditions when the code set
  • Visually inspect the PS cut switch connector, harness, and steering column area for damage, corrosion or water ingress
  • Check relevant fuses and relays for the power/ignition circuit feeding the switch
  • Backprobe the switch connector and scan-tool live data while operating the steering (or activating the switch) to observe signal changes
  • Measure continuity between the switch and the controller input; check resistance of the switch (activated vs not activated)
  • Wiggle test harness while observing live data to find intermittent opens

Signal parameters

  • Switch open state: continuity = infinite / OL; closed state: near 0 Ω (exact ohms depend on switch)
  • Typical signal line behavior: open when not activated, closes when activated (N.O. type)
  • Signal voltage may be pulled to reference voltage (usually system 5V or battery) through ECU; consult service manual for exact voltages
  • No valid signal or stuck-open condition reported to control module when fault present

Diagnostic algorithm

  1. Verify the fault: Connect scanner, confirm B1574 is present, note freeze-frame and any related codes. Clear codes and attempt to reproduce.
  2. Visual inspection: Check switch, connector, and harness for damage, corrosion, or water. Repair visible wiring damage.
  3. Power/ground/fuse check: Verify the switch supply fuse and any ignition power feed, and confirm good ground(s) for the related module.
  4. Signal verification: Backprobe the switch connector. With the ignition on, operate the steering or the specific action that should change the switch state and observe the signal on the scanner or a multimeter. Expect an open circuit when inactive and continuity when activated (refer to service manual for exact behavior).
  5. Continuity test: Disconnect battery (if required by service manual), measure continuity between switch terminals and the control module connector. Repair any open circuits or high-resistance connections.
  6. Replace suspect components: If wiring and connectors are good but the switch does not change state, replace the PS cut switch. If the wiring/power/ground are suspect, repair harness or connectors as needed.
  7. Re-test: Reconnect everything, clear codes, and perform a road test or reproduction of the fault conditions to ensure code does not return.
  8. Module evaluation: If fault remains after wiring and switch repairs, consider module input circuit failure; perform further module diagnostics or consult manufacturer service information before replacing the control unit.

Likely causes

  • Damaged/broken wire or pinched harness near steering column or underdash
  • Corrosion or poor contact at the switch connector
  • Failed PS cut switch (internal contact open)
  • Blown fuse supplying the switch circuit
  • Poor ground at control module or steering unit
  • Intermittent connector due to vibration or previous repairs

Fault status

⚠️ Status
PS cut switch circuit open (N.O.) — open circuit detected on power steering cut switch input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1573 B1575 B1570 C1234 U0121
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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Code

B1574

Other B — Body

Door Ajar LR Circuit Short To Ground

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

Causes

  • Open circuit in PS cut switch wiring
  • Faulty or mechanically stuck PS cut switch
  • Corroded or loose connector at the switch or control module
  • Blown fuse or poor power/ground supply to the switch circuit
  • Water intrusion or physical damage to harness near steering column
  • Faulty steering control module / ECU

Symptoms

  • EPS / power steering assist warning lamp illuminated
  • Reduced or lost steering assist (heavier steering effort)
  • Related engine or traction control intervention in some models
  • Stored B1574 code and possible additional steering-related faults
  • Intermittent loss of assist correlated with steering angle or vibration

What to check

  • Read and record DTC(s) and freeze frame data with a diagnostic scanner; note conditions when the code set
  • Visually inspect the PS cut switch connector, harness, and steering column area for damage, corrosion or water ingress
  • Check relevant fuses and relays for the power/ignition circuit feeding the switch
  • Backprobe the switch connector and scan-tool live data while operating the steering (or activating the switch) to observe signal changes
  • Measure continuity between the switch and the controller input; check resistance of the switch (activated vs not activated)
  • Wiggle test harness while observing live data to find intermittent opens

Signal parameters

  • Switch open state: continuity = infinite / OL; closed state: near 0 Ω (exact ohms depend on switch)
  • Typical signal line behavior: open when not activated, closes when activated (N.O. type)
  • Signal voltage may be pulled to reference voltage (usually system 5V or battery) through ECU; consult service manual for exact voltages
  • No valid signal or stuck-open condition reported to control module when fault present

Diagnostic algorithm

  1. Verify the fault: Connect scanner, confirm B1574 is present, note freeze-frame and any related codes. Clear codes and attempt to reproduce.
  2. Visual inspection: Check switch, connector, and harness for damage, corrosion, or water. Repair visible wiring damage.
  3. Power/ground/fuse check: Verify the switch supply fuse and any ignition power feed, and confirm good ground(s) for the related module.
  4. Signal verification: Backprobe the switch connector. With the ignition on, operate the steering or the specific action that should change the switch state and observe the signal on the scanner or a multimeter. Expect an open circuit when inactive and continuity when activated (refer to service manual for exact behavior).
  5. Continuity test: Disconnect battery (if required by service manual), measure continuity between switch terminals and the control module connector. Repair any open circuits or high-resistance connections.
  6. Replace suspect components: If wiring and connectors are good but the switch does not change state, replace the PS cut switch. If the wiring/power/ground are suspect, repair harness or connectors as needed.
  7. Re-test: Reconnect everything, clear codes, and perform a road test or reproduction of the fault conditions to ensure code does not return.
  8. Module evaluation: If fault remains after wiring and switch repairs, consider module input circuit failure; perform further module diagnostics or consult manufacturer service information before replacing the control unit.

Likely causes

  • Damaged/broken wire or pinched harness near steering column or underdash
  • Corrosion or poor contact at the switch connector
  • Failed PS cut switch (internal contact open)
  • Blown fuse supplying the switch circuit
  • Poor ground at control module or steering unit
  • Intermittent connector due to vibration or previous repairs

Fault status

⚠️ Status
PS cut switch circuit open (N.O.) — open circuit detected on power steering cut switch input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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