Code
B1575
MITSUBISHI
B — Body
PS.cut SW SHT.to GND.for N.O
Views:
UK: 11
EN: 26
RU: 15
AI status
Completed
Completed
100%
Causes
- Wiring shorted to chassis ground (chafed wire, pinched harness)
- Failed PS cut switch (internal short or stuck closed)
- Corroded or damaged connector or terminal creating a ground path
- Poor repair or aftermarket modification that bridged the circuit to ground
- Faulty control module input (rare)
Symptoms
- Malfunction indicator or related warning lamp illuminated
- Associated system (the device controlled by PS cut switch) disabled or not operating
- Intermittent operation of the affected system
- DTC stored in body/control module memory
What to check
- Read freeze frame / stored data and confirm B1575 is current or history
- Visually inspect wiring and connectors on PS cut switch and adjacent harness for damage, corrosion, or chafing
- Check related fuses and power/ground supply integrity
- Backprobe the switch connector and measure voltage at key ON with switch in both positions
- Perform continuity check between the switch signal wire and chassis ground with connector disconnected
- Wiggle test harness while monitoring voltage/DTC to reproduce fault
Signal parameters
- Expected with N.O. switch open: signal line pulled high by module or battery through pull-up — typically ~5 V (or vehicle-specific reference, sometimes 12 V) at module input
- Expected with switch closed: signal should be pulled to ground (≈0 V) by the switch
- Fault condition (short to ground when switch should be open): signal ≈0 V when it should be high
- Typical continuity: open (OL) when switch open; near 0 Ω when closed. With connector disconnected, continuity between signal wire and chassis ground should be infinite (no continuity)
Diagnostic algorithm
- Confirm DTC B1575 with a scan tool; clear codes and perform key cycles to see if code returns.
- Identify the exact PS cut switch wiring and connector using vehicle wiring diagram or service manual.
- Visually inspect the switch, harness, and connector for damage, corrosion, water ingress, or pin deformation.
- With ignition ON, backprobe the switch signal wire and record voltage with the switch in normal (open) position — it should be high. If ~0 V, suspect short to ground.
- Disconnect the switch connector. Measure continuity between the signal wire (at harness side) and chassis ground. There should be no continuity. If continuity exists, trace and repair harness to find where it contacts ground.
- If harness shows no short, bench-test or substitute the PS cut switch to verify correct operation (open/closed continuity). Replace switch if faulty.
- If switch and harness check OK but fault persists, inspect for poor grounds or shorts introduced by nearby components, clips, or aftermarket work. Repair any damaged insulation or reroute harness.
- If wiring and switch are good, test the controlling module input pin for internal short to ground per service manual. Replace module only after all wiring/switch faults are excluded.
- After repairs, clear codes, perform functional tests and drive cycle to confirm B1575 does not return.
Likely causes
- Damaged insulation where the switch harness contacts metal and is grounded
- Switch internal failure causing terminal to be grounded
- Connector corrosion or bent terminal that contacts ground
- Short created during previous service (zip-tie, clip, routing)
Fault status
Status
Control module detected the PS cut switch signal permanently pulled to ground while the switch is expected to be open (normally-open switch shorted to ground).
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
B1575
Other
B — Body
Lamp Park Input Circuit Failure
Views:
UK: 26
EN: 40
RU: 29
AI status
Completed
Completed
100%
Causes
- Wiring shorted to chassis ground (chafed wire, pinched harness)
- Failed PS cut switch (internal short or stuck closed)
- Corroded or damaged connector or terminal creating a ground path
- Poor repair or aftermarket modification that bridged the circuit to ground
- Faulty control module input (rare)
Symptoms
- Malfunction indicator or related warning lamp illuminated
- Associated system (the device controlled by PS cut switch) disabled or not operating
- Intermittent operation of the affected system
- DTC stored in body/control module memory
What to check
- Read freeze frame / stored data and confirm B1575 is current or history
- Visually inspect wiring and connectors on PS cut switch and adjacent harness for damage, corrosion, or chafing
- Check related fuses and power/ground supply integrity
- Backprobe the switch connector and measure voltage at key ON with switch in both positions
- Perform continuity check between the switch signal wire and chassis ground with connector disconnected
- Wiggle test harness while monitoring voltage/DTC to reproduce fault
Signal parameters
- Expected with N.O. switch open: signal line pulled high by module or battery through pull-up — typically ~5 V (or vehicle-specific reference, sometimes 12 V) at module input
- Expected with switch closed: signal should be pulled to ground (≈0 V) by the switch
- Fault condition (short to ground when switch should be open): signal ≈0 V when it should be high
- Typical continuity: open (OL) when switch open; near 0 Ω when closed. With connector disconnected, continuity between signal wire and chassis ground should be infinite (no continuity)
Diagnostic algorithm
- Confirm DTC B1575 with a scan tool; clear codes and perform key cycles to see if code returns.
- Identify the exact PS cut switch wiring and connector using vehicle wiring diagram or service manual.
- Visually inspect the switch, harness, and connector for damage, corrosion, water ingress, or pin deformation.
- With ignition ON, backprobe the switch signal wire and record voltage with the switch in normal (open) position — it should be high. If ~0 V, suspect short to ground.
- Disconnect the switch connector. Measure continuity between the signal wire (at harness side) and chassis ground. There should be no continuity. If continuity exists, trace and repair harness to find where it contacts ground.
- If harness shows no short, bench-test or substitute the PS cut switch to verify correct operation (open/closed continuity). Replace switch if faulty.
- If switch and harness check OK but fault persists, inspect for poor grounds or shorts introduced by nearby components, clips, or aftermarket work. Repair any damaged insulation or reroute harness.
- If wiring and switch are good, test the controlling module input pin for internal short to ground per service manual. Replace module only after all wiring/switch faults are excluded.
- After repairs, clear codes, perform functional tests and drive cycle to confirm B1575 does not return.
Likely causes
- Damaged insulation where the switch harness contacts metal and is grounded
- Switch internal failure causing terminal to be grounded
- Connector corrosion or bent terminal that contacts ground
- Short created during previous service (zip-tie, clip, routing)
Fault status
Status
Control module detected the PS cut switch signal permanently pulled to ground while the switch is expected to be open (normally-open switch shorted to ground).
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email