Code
B1577
MITSUBISHI
B — Body
PS.cut SW OPEN for COM
Views:
UK: 11
EN: 14
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the PS.cut switch circuit
- Poor or corroded connector terminals at the switch or control module
- Faulty PS.cut switch (mechanical/electrical failure)
- Water intrusion or physical damage to harness/connectors
- Intermittent connection due to damaged insulation or chafing
- Faulty control module or internal communication fault
Symptoms
- DTC B1577 stored and MIL or a warning lamp may illuminate
- Associated system (e.g., power steering assist or related feature) may be disabled or operate intermittently
- Loss of communication or erroneous status for the affected function
- Noisy or intermittent operation of the related controls
- Symptoms may be present only under certain operating conditions (vibration, moisture)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool; note related communication codes
- Inspect harness and connectors at the PS.cut switch and the associated control module for corrosion, damage, or loose pins
- Perform a wiggle test on the wiring while monitoring the fault — look for intermittent changes
- Verify proper power and ground to the control module and any intermediary junctions
- Consult wiring diagram to identify connector/pin assignments before testing
- Check for signs of water ingress or physical damage in the area of the switch or harness
Signal parameters
- Expected behavior: closed switch = low resistance/ground or logic signal; open switch = high resistance/open circuit (infinite Ω) — consult OEM manual for exact values
- Typical reference voltage to a switch circuit may be ~5 V (signal) or battery voltage for power circuits; when circuit is open the module will see no signal or a defined pull-up/pull-down voltage
- Continuity: 0–5 Ω when closed (typical for a direct switch), >>1 MΩ when open; actual values depend on vehicle design — verify with factory data
- Watch for intermittent voltage changes when operating the switch or moving harness
Diagnostic algorithm
- Retrieve full code list and freeze frame with a scan tool; note any related communication codes (U-codes) and clear codes to see if B1577 reappears.
- Obtain the vehicle-specific wiring diagram and identify the PS.cut switch connector, wires, and associated control module pins.
- Visually inspect connectors and wiring for damage, corrosion, and secure fit. Repair or clean connectors as needed.
- With ignition ON (or as specified), backprobe the switch connector and measure reference voltage and signal voltage. Compare to factory values.
- Check continuity between the switch and the control module pin with the harness disconnected; look for open or high resistance.
- If wiring and connectors are good, bench-test or measure the switch operation (resistance change or signal change when actuated).
- If the switch is faulty, replace the switch and retest. If wiring is faulty, repair splices or replace wiring sections and protect against recurrence.
- If switch and wiring test good, investigate the control module for a failed input or communication problem. Confirm grounds and supply voltages. Reflash or replace module only after confirming external circuit integrity.
- After repairs, clear codes and perform a functional test/road test to confirm the fault does not return.
Likely causes
- Disconnected or loose connector at the PS.cut switch
- Broken wire or pinched harness between the switch and module
- Corroded pins causing high resistance/open circuit
- Failed PS.cut switch contacts internally
Fault status
Status
Open circuit detected on PS.cut switch circuit; control module reports loss or invalid signal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1577
Other
B — Body
Lamp Park Input Circuit Short To Battery
Views:
UK: 20
EN: 24
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the PS.cut switch circuit
- Poor or corroded connector terminals at the switch or control module
- Faulty PS.cut switch (mechanical/electrical failure)
- Water intrusion or physical damage to harness/connectors
- Intermittent connection due to damaged insulation or chafing
- Faulty control module or internal communication fault
Symptoms
- DTC B1577 stored and MIL or a warning lamp may illuminate
- Associated system (e.g., power steering assist or related feature) may be disabled or operate intermittently
- Loss of communication or erroneous status for the affected function
- Noisy or intermittent operation of the related controls
- Symptoms may be present only under certain operating conditions (vibration, moisture)
What to check
- Read and record all stored codes and freeze-frame data with a scan tool; note related communication codes
- Inspect harness and connectors at the PS.cut switch and the associated control module for corrosion, damage, or loose pins
- Perform a wiggle test on the wiring while monitoring the fault — look for intermittent changes
- Verify proper power and ground to the control module and any intermediary junctions
- Consult wiring diagram to identify connector/pin assignments before testing
- Check for signs of water ingress or physical damage in the area of the switch or harness
Signal parameters
- Expected behavior: closed switch = low resistance/ground or logic signal; open switch = high resistance/open circuit (infinite Ω) — consult OEM manual for exact values
- Typical reference voltage to a switch circuit may be ~5 V (signal) or battery voltage for power circuits; when circuit is open the module will see no signal or a defined pull-up/pull-down voltage
- Continuity: 0–5 Ω when closed (typical for a direct switch), >>1 MΩ when open; actual values depend on vehicle design — verify with factory data
- Watch for intermittent voltage changes when operating the switch or moving harness
Diagnostic algorithm
- Retrieve full code list and freeze frame with a scan tool; note any related communication codes (U-codes) and clear codes to see if B1577 reappears.
- Obtain the vehicle-specific wiring diagram and identify the PS.cut switch connector, wires, and associated control module pins.
- Visually inspect connectors and wiring for damage, corrosion, and secure fit. Repair or clean connectors as needed.
- With ignition ON (or as specified), backprobe the switch connector and measure reference voltage and signal voltage. Compare to factory values.
- Check continuity between the switch and the control module pin with the harness disconnected; look for open or high resistance.
- If wiring and connectors are good, bench-test or measure the switch operation (resistance change or signal change when actuated).
- If the switch is faulty, replace the switch and retest. If wiring is faulty, repair splices or replace wiring sections and protect against recurrence.
- If switch and wiring test good, investigate the control module for a failed input or communication problem. Confirm grounds and supply voltages. Reflash or replace module only after confirming external circuit integrity.
- After repairs, clear codes and perform a functional test/road test to confirm the fault does not return.
Likely causes
- Disconnected or loose connector at the PS.cut switch
- Broken wire or pinched harness between the switch and module
- Corroded pins causing high resistance/open circuit
- Failed PS.cut switch contacts internally
Fault status
Status
Open circuit detected on PS.cut switch circuit; control module reports loss or invalid signal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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