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Home / DTC / B1579 — PS.cut SW SHT.to BATT.for COM

B1579 — PS.cut SW SHT.to BATT.for COM

Detailed page for trouble code B1579.

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59brands
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22,491specific
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Code

B1579

MITSUBISHI B — Body

PS.cut SW SHT.to BATT.for COM

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

Causes

  • Short circuit between PS cut switch communication wire and battery positive
  • Damaged or chafed wiring harness or pinched cable
  • Corroded or loose connector at the PS cut switch or control module
  • Faulty PS cut switch (internal short)
  • Faulty body control module / ECU with internal short to battery
  • Aftermarket device or improper repair created a high-voltage tie to the communication line

Symptoms

  • Communication errors or loss of communication with one or more modules
  • Related features controlled by the affected module do not operate (depending on module)
  • Dashboard warning lights or error messages
  • Parasitic battery drain in some cases
  • Intermittent operation of affected systems or modules

What to check

  • Read and record freeze frame and full DTC list with a scan tool
  • Visually inspect wiring and connectors at the PS cut switch and related modules for damage, corrosion, or pinched wires
  • Check for aftermarket accessories or recent repairs in the area of the fault
  • Measure battery voltage and verify good ground connections before testing communications
  • Backprobe the communication line at the switch and module while monitoring with a multimeter/oscilloscope
  • Disconnect the PS cut switch connector and see if the DTC clears or conditions change

Signal parameters

  • Battery supply nominal ~12 V (vehicle off) to ~13.5–14.5 V (charging) — short to battery will pull the line to B+
  • Communication line should not be held at battery potential; a short-to-B+ will prevent normal signaling
  • If the circuit is a LIN/single-wire bus, the line normally rests at a bus recessive voltage (pulled up) and is driven low for frames; a hard B+ short prevents proper frames
  • If the circuit is CAN, expect typical idle voltages on CAN_H and CAN_L and a healthy differential — abnormal constant high on a single wire indicates a short

Diagnostic algorithm

  1. Connect a capable scan tool, read/record DTCs and freeze frame data. Note affected modules.
  2. Inspect visually: follow harness from the PS cut switch to the module(s) looking for pinched, melted, or chafed wiring and damaged insulation.
  3. With ignition OFF, disconnect the PS cut switch connector. Clear DTCs and cycle ignition. If code does not return, suspect the switch or connector wiring.
  4. Backprobe the communication wire at the switch and at the module with ignition ON (engine off). Measure voltage relative to chassis ground. A steady B+ indicates a short to battery.
  5. If voltage indicates short, isolate sections of harness by disconnecting intermediate connectors and retest to locate the shorted segment.
  6. Perform continuity and resistance checks between the communication wire and battery positive with the circuit isolated to confirm short. Also check for unintended continuity to battery through accessories.
  7. Inspect and repair/replace damaged wiring, corroded connectors, or the PS cut switch as indicated. Use heat-shrink, correct terminals, and manufacturer routing.
  8. If wiring and switch check good, suspect internal module fault. Replace or repair the control module per manufacturer procedures.
  9. After repair, clear codes, perform functional test and confirm no recurrence during vehicle operation.

Likely causes

  • Wiring harness chafe or damaged insulation contacting battery feed
  • Connector corrosion or bent terminal at the switch or module
  • Failed PS cut switch with internal short to B+
  • Accessory or recent work disturbed wiring near the switch/module

Fault status

⚠️ Status
Communication line to PS cut switch detected short to battery; module communication fault present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0073 U0121 B1578 B1580
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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