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Home / DTC / B1581 — PS.cut off SW wrong installation

B1581 — PS.cut off SW wrong installation

Detailed page for trouble code B1581.

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Code

B1581

MITSUBISHI B — Body

PS.cut off SW wrong installation

Brand: MITSUBISHI
Type: B — Body
Views: UK: 10 EN: 25 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • PS cut-off switch installed backwards or in the wrong location
  • Incorrect replacement switch (wrong part) or aftermarket modification
  • Incorrect connector pinning or mis-routed connector
  • Damaged, corroded or disconnected wiring/harness for the switch
  • Short or open in the switch circuit (to ground or battery)
  • Improper switch adjustment or mechanical interference preventing correct operation

Symptoms

  • PS/EPS warning lamp or general warning lamp on instrument panel
  • Loss or intermittent loss of power steering assist
  • Unusual steering effort or steering feedback
  • Related systems may show faults or limp behavior if the PS signal is used by other controllers
  • DTC B1581 stored and may reappear after clearing if root cause not fixed

What to check

  • Read and record all stored DTCs and freeze-frame/live data
  • Visually inspect switch orientation, mounting, and connector for damage or incorrect installation
  • Check connector is fully seated and locking tab engaged
  • Inspect wiring harness for chafing, kinks, repairs, or corrosion along the circuit route
  • Measure voltage and signal at the switch connector with key ON (refer to service manual for exact pinouts)
  • Perform continuity/resistance check between switch connector and ECU connector

Signal parameters

  • Reference voltage to switch (varies by vehicle — commonly 5 V or battery voltage; consult service manual)
  • Switch output voltage: expected low/ground and high/5V/12V states depending on design
  • Contact resistance when closed (should be near 0 ohms) and open (infinite or very high)
  • Continuity between switch terminal and ECU terminal (should be present)
  • No short to battery or ground on the switch circuit (measurable using Ohmmeter)

Diagnostic algorithm

  1. Connect a capable scan tool, read DTCs and live data, record freeze frame. Note when the code sets.
  2. Consult the factory wiring diagram for the PS cut-off switch: identify connector pins, reference voltage, and circuit routing.
  3. Perform a visual inspection of the switch assembly and connector. Confirm correct part number and physical orientation/mounting.
  4. With ignition ON (engine OFF), measure reference voltage and switch output at the harness connector. Operate the switch and verify expected change in signal.
  5. Check continuity/resistance between the switch connector and the corresponding ECU connector pins (with battery disconnected). Repair any open or high-resistance sections.
  6. Inspect and, if necessary, repair connector terminals or wiring (clean corrosion, replace bent pins, secure connectors).
  7. If harness and switch checks are good, replace the PS cut-off switch with a correct OEM part and re-test.
  8. Clear codes, perform a functional test/road test, and re-scan to confirm the fault does not return.
  9. If fault persists after replacing switch and repairing wiring, inspect ECU connector and consider further module diagnostics or manufacturer support.

Likely causes

  • Switch rotated 180° or physically mounted in wrong orientation during service
  • Replacement switch has different pinout than original
  • Connector not fully seated or retaining clip broken after reassembly
  • Wire insulation chafed and shorting where it passes through chassis/bracket
  • Corroded terminals inside the connector causing high resistance or intermittent contact
  • Switch contacts stuck or contaminated so they do not change state when actuated

Fault status

⚠️ Status
PS cut-off switch circuit: signal or installation fault detected. Switch not providing expected input to control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1580 B1582 B1583 U0121 U0140
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Code

B1581

Other B — Body

Dim Panel Increase Input Circuit Short To Battery

Brand: Other
Type: B — Body
Views: UK: 17 EN: 39 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • PS cut-off switch installed backwards or in the wrong location
  • Incorrect replacement switch (wrong part) or aftermarket modification
  • Incorrect connector pinning or mis-routed connector
  • Damaged, corroded or disconnected wiring/harness for the switch
  • Short or open in the switch circuit (to ground or battery)
  • Improper switch adjustment or mechanical interference preventing correct operation

Symptoms

  • PS/EPS warning lamp or general warning lamp on instrument panel
  • Loss or intermittent loss of power steering assist
  • Unusual steering effort or steering feedback
  • Related systems may show faults or limp behavior if the PS signal is used by other controllers
  • DTC B1581 stored and may reappear after clearing if root cause not fixed

What to check

  • Read and record all stored DTCs and freeze-frame/live data
  • Visually inspect switch orientation, mounting, and connector for damage or incorrect installation
  • Check connector is fully seated and locking tab engaged
  • Inspect wiring harness for chafing, kinks, repairs, or corrosion along the circuit route
  • Measure voltage and signal at the switch connector with key ON (refer to service manual for exact pinouts)
  • Perform continuity/resistance check between switch connector and ECU connector

Signal parameters

  • Reference voltage to switch (varies by vehicle — commonly 5 V or battery voltage; consult service manual)
  • Switch output voltage: expected low/ground and high/5V/12V states depending on design
  • Contact resistance when closed (should be near 0 ohms) and open (infinite or very high)
  • Continuity between switch terminal and ECU terminal (should be present)
  • No short to battery or ground on the switch circuit (measurable using Ohmmeter)

Diagnostic algorithm

  1. Connect a capable scan tool, read DTCs and live data, record freeze frame. Note when the code sets.
  2. Consult the factory wiring diagram for the PS cut-off switch: identify connector pins, reference voltage, and circuit routing.
  3. Perform a visual inspection of the switch assembly and connector. Confirm correct part number and physical orientation/mounting.
  4. With ignition ON (engine OFF), measure reference voltage and switch output at the harness connector. Operate the switch and verify expected change in signal.
  5. Check continuity/resistance between the switch connector and the corresponding ECU connector pins (with battery disconnected). Repair any open or high-resistance sections.
  6. Inspect and, if necessary, repair connector terminals or wiring (clean corrosion, replace bent pins, secure connectors).
  7. If harness and switch checks are good, replace the PS cut-off switch with a correct OEM part and re-test.
  8. Clear codes, perform a functional test/road test, and re-scan to confirm the fault does not return.
  9. If fault persists after replacing switch and repairing wiring, inspect ECU connector and consider further module diagnostics or manufacturer support.

Likely causes

  • Switch rotated 180° or physically mounted in wrong orientation during service
  • Replacement switch has different pinout than original
  • Connector not fully seated or retaining clip broken after reassembly
  • Wire insulation chafed and shorting where it passes through chassis/bracket
  • Corroded terminals inside the connector causing high resistance or intermittent contact
  • Switch contacts stuck or contaminated so they do not change state when actuated

Fault status

⚠️ Status
PS cut-off switch circuit: signal or installation fault detected. Switch not providing expected input to control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1580 B1582 B1583 U0121 U0140
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