Code
B1531
ALFA ROMEO
B — Body
Memory 1 switch circuit
Views:
UK: 3
EN: 3
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty Memory 1 switch (mechanical or internal electrical failure)
- Open or short in the switch wiring harness or connector
- Poor or corroded connector pins/terminals
- Blown fuse or protected circuit fault
- Poor ground or supply voltage to the switch or module
- Water ingress or contamination of the switch/connector
Symptoms
- Memory 1 function will not store or recall settings
- Memory switch does not respond or is intermittent
- No response when pressing Memory 1 but other memory positions (if present) may work
- Related warning or message on dash (module-dependent)
- Possible multiple related functions failing if the supply/ground is shared
What to check
- Read and record DTCs and any freeze-frame data with a diagnostic scanner; clear and re-scan
- Verify vehicle battery voltage is within normal range
- Visually inspect switch, connector and wiring for damage, corrosion, water ingress or crushed wires
- Check related fuses and fusible links for continuity
- Backprobe switch connector and check for reference supply and ground with switch at rest and operated
- Check continuity between switch connector and BCM connector for opens/shorts
Signal parameters
- Supply voltage to switch: approximately battery voltage (~11–14 V) with ignition on
- Reference/logic input to BCM: typically 0–5 V signal depending on manufacturer interface (check vehicle wiring diagram)
- Closed switch resistance: near 0 Ω (low ohms) between the two switch terminals
- Open switch resistance: high/OL (open circuit) when not pressed
- Ground continuity:
Diagnostic algorithm
- Connect a diagnostic scanner, read all stored codes and freeze-frame; note any related codes. Clear codes and attempt to re-create the fault. 2) Check vehicle battery voltage and main fuses; inspect/replace any blown fuses protecting the memory switch circuit. 3) Visually inspect the memory switch assembly and wiring harness for damage, corrosion, water, or loose connectors. Repair as necessary. 4) Backprobe the memory 1 switch connector: verify supply battery voltage with ignition on, verify ground continuity. 5) Operate the Memory 1 switch while monitoring the signal line voltage to the control module; expect supply voltage present and a change to near ground or a defined logic level when pressed. 6) If voltages are not as expected, check continuity between the switch connector and the BCM connector for open circuits or shorts to ground/power. Repair wiring faults. 7) If wiring and switch tests good, swap in a known-good switch (if available) to confirm switch failure. 8) If switch and wiring are good, check BCM inputs and grounds; test/replace BCM only after confirming upstream wiring and switch are functional. 9) After repair, clear codes, perform function test and re-scan to confirm code does not return. 10) If intermittent, perform wiggle tests and consider protecting/repairing harness routing to prevent future faults.
Likely causes
- Open/short in wiring between Memory 1 switch and BCM (most common)
- Failed Memory 1 switch (stuck or intermittent contacts)
- Corroded/loose connector or poor ground connection
- Blown fuse or loss of supply voltage to the switch
- Less likely: internal BCM input fault or software error
Fault status
Status
Memory 1 switch circuit — electrical fault detected (input signal missing/incorrect or circuit fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1531
FIAT
B — Body
Memory 1 switch circuit
Views:
UK: 2
EN: 3
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty Memory 1 switch (mechanical or internal electrical failure)
- Open or short in the switch wiring harness or connector
- Poor or corroded connector pins/terminals
- Blown fuse or protected circuit fault
- Poor ground or supply voltage to the switch or module
- Water ingress or contamination of the switch/connector
Symptoms
- Memory 1 function will not store or recall settings
- Memory switch does not respond or is intermittent
- No response when pressing Memory 1 but other memory positions (if present) may work
- Related warning or message on dash (module-dependent)
- Possible multiple related functions failing if the supply/ground is shared
What to check
- Read and record DTCs and any freeze-frame data with a diagnostic scanner; clear and re-scan
- Verify vehicle battery voltage is within normal range
- Visually inspect switch, connector and wiring for damage, corrosion, water ingress or crushed wires
- Check related fuses and fusible links for continuity
- Backprobe switch connector and check for reference supply and ground with switch at rest and operated
- Check continuity between switch connector and BCM connector for opens/shorts
Signal parameters
- Supply voltage to switch: approximately battery voltage (~11–14 V) with ignition on
- Reference/logic input to BCM: typically 0–5 V signal depending on manufacturer interface (check vehicle wiring diagram)
- Closed switch resistance: near 0 Ω (low ohms) between the two switch terminals
- Open switch resistance: high/OL (open circuit) when not pressed
- Ground continuity:
Diagnostic algorithm
- Connect a diagnostic scanner, read all stored codes and freeze-frame; note any related codes. Clear codes and attempt to re-create the fault. 2) Check vehicle battery voltage and main fuses; inspect/replace any blown fuses protecting the memory switch circuit. 3) Visually inspect the memory switch assembly and wiring harness for damage, corrosion, water, or loose connectors. Repair as necessary. 4) Backprobe the memory 1 switch connector: verify supply battery voltage with ignition on, verify ground continuity. 5) Operate the Memory 1 switch while monitoring the signal line voltage to the control module; expect supply voltage present and a change to near ground or a defined logic level when pressed. 6) If voltages are not as expected, check continuity between the switch connector and the BCM connector for open circuits or shorts to ground/power. Repair wiring faults. 7) If wiring and switch tests good, swap in a known-good switch (if available) to confirm switch failure. 8) If switch and wiring are good, check BCM inputs and grounds; test/replace BCM only after confirming upstream wiring and switch are functional. 9) After repair, clear codes, perform function test and re-scan to confirm code does not return. 10) If intermittent, perform wiggle tests and consider protecting/repairing harness routing to prevent future faults.
Likely causes
- Open/short in wiring between Memory 1 switch and BCM (most common)
- Failed Memory 1 switch (stuck or intermittent contacts)
- Corroded/loose connector or poor ground connection
- Blown fuse or loss of supply voltage to the switch
- Less likely: internal BCM input fault or software error
Fault status
Status
Memory 1 switch circuit — electrical fault detected (input signal missing/incorrect or circuit fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1531
MITSUBISHI
B — Body
PS.buckle SW open for N.C
Views:
UK: 9
EN: 10
RU: 35
AI status
Completed
Completed
100%
Causes
- Faulty Memory 1 switch (mechanical or internal electrical failure)
- Open or short in the switch wiring harness or connector
- Poor or corroded connector pins/terminals
- Blown fuse or protected circuit fault
- Poor ground or supply voltage to the switch or module
- Water ingress or contamination of the switch/connector
Symptoms
- Memory 1 function will not store or recall settings
- Memory switch does not respond or is intermittent
- No response when pressing Memory 1 but other memory positions (if present) may work
- Related warning or message on dash (module-dependent)
- Possible multiple related functions failing if the supply/ground is shared
What to check
- Read and record DTCs and any freeze-frame data with a diagnostic scanner; clear and re-scan
- Verify vehicle battery voltage is within normal range
- Visually inspect switch, connector and wiring for damage, corrosion, water ingress or crushed wires
- Check related fuses and fusible links for continuity
- Backprobe switch connector and check for reference supply and ground with switch at rest and operated
- Check continuity between switch connector and BCM connector for opens/shorts
Signal parameters
- Supply voltage to switch: approximately battery voltage (~11–14 V) with ignition on
- Reference/logic input to BCM: typically 0–5 V signal depending on manufacturer interface (check vehicle wiring diagram)
- Closed switch resistance: near 0 Ω (low ohms) between the two switch terminals
- Open switch resistance: high/OL (open circuit) when not pressed
- Ground continuity:
Diagnostic algorithm
- Connect a diagnostic scanner, read all stored codes and freeze-frame; note any related codes. Clear codes and attempt to re-create the fault. 2) Check vehicle battery voltage and main fuses; inspect/replace any blown fuses protecting the memory switch circuit. 3) Visually inspect the memory switch assembly and wiring harness for damage, corrosion, water, or loose connectors. Repair as necessary. 4) Backprobe the memory 1 switch connector: verify supply battery voltage with ignition on, verify ground continuity. 5) Operate the Memory 1 switch while monitoring the signal line voltage to the control module; expect supply voltage present and a change to near ground or a defined logic level when pressed. 6) If voltages are not as expected, check continuity between the switch connector and the BCM connector for open circuits or shorts to ground/power. Repair wiring faults. 7) If wiring and switch tests good, swap in a known-good switch (if available) to confirm switch failure. 8) If switch and wiring are good, check BCM inputs and grounds; test/replace BCM only after confirming upstream wiring and switch are functional. 9) After repair, clear codes, perform function test and re-scan to confirm code does not return. 10) If intermittent, perform wiggle tests and consider protecting/repairing harness routing to prevent future faults.
Likely causes
- Open/short in wiring between Memory 1 switch and BCM (most common)
- Failed Memory 1 switch (stuck or intermittent contacts)
- Corroded/loose connector or poor ground connection
- Blown fuse or loss of supply voltage to the switch
- Less likely: internal BCM input fault or software error
Fault status
Status
Memory 1 switch circuit — electrical fault detected (input signal missing/incorrect or circuit fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1531
Other
B — Body
Memory 1 Switch Circuit Failure
Views:
UK: 17
EN: 29
RU: 52
AI status
Completed
Completed
100%
Causes
- Faulty Memory 1 switch (mechanical or internal electrical failure)
- Open or short in the switch wiring harness or connector
- Poor or corroded connector pins/terminals
- Blown fuse or protected circuit fault
- Poor ground or supply voltage to the switch or module
- Water ingress or contamination of the switch/connector
Symptoms
- Memory 1 function will not store or recall settings
- Memory switch does not respond or is intermittent
- No response when pressing Memory 1 but other memory positions (if present) may work
- Related warning or message on dash (module-dependent)
- Possible multiple related functions failing if the supply/ground is shared
What to check
- Read and record DTCs and any freeze-frame data with a diagnostic scanner; clear and re-scan
- Verify vehicle battery voltage is within normal range
- Visually inspect switch, connector and wiring for damage, corrosion, water ingress or crushed wires
- Check related fuses and fusible links for continuity
- Backprobe switch connector and check for reference supply and ground with switch at rest and operated
- Check continuity between switch connector and BCM connector for opens/shorts
Signal parameters
- Supply voltage to switch: approximately battery voltage (~11–14 V) with ignition on
- Reference/logic input to BCM: typically 0–5 V signal depending on manufacturer interface (check vehicle wiring diagram)
- Closed switch resistance: near 0 Ω (low ohms) between the two switch terminals
- Open switch resistance: high/OL (open circuit) when not pressed
- Ground continuity:
Diagnostic algorithm
- Connect a diagnostic scanner, read all stored codes and freeze-frame; note any related codes. Clear codes and attempt to re-create the fault. 2) Check vehicle battery voltage and main fuses; inspect/replace any blown fuses protecting the memory switch circuit. 3) Visually inspect the memory switch assembly and wiring harness for damage, corrosion, water, or loose connectors. Repair as necessary. 4) Backprobe the memory 1 switch connector: verify supply battery voltage with ignition on, verify ground continuity. 5) Operate the Memory 1 switch while monitoring the signal line voltage to the control module; expect supply voltage present and a change to near ground or a defined logic level when pressed. 6) If voltages are not as expected, check continuity between the switch connector and the BCM connector for open circuits or shorts to ground/power. Repair wiring faults. 7) If wiring and switch tests good, swap in a known-good switch (if available) to confirm switch failure. 8) If switch and wiring are good, check BCM inputs and grounds; test/replace BCM only after confirming upstream wiring and switch are functional. 9) After repair, clear codes, perform function test and re-scan to confirm code does not return. 10) If intermittent, perform wiggle tests and consider protecting/repairing harness routing to prevent future faults.
Likely causes
- Open/short in wiring between Memory 1 switch and BCM (most common)
- Failed Memory 1 switch (stuck or intermittent contacts)
- Corroded/loose connector or poor ground connection
- Blown fuse or loss of supply voltage to the switch
- Less likely: internal BCM input fault or software error
Fault status
Status
Memory 1 switch circuit — electrical fault detected (input signal missing/incorrect or circuit fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
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