Code
B1537
ALFA ROMEO
B — Body
Memory 2 switch circuit short to positive
Views:
UK: 10
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring contacting battery positive or a fused power feed
- Shorted or internally failed memory switch (Memory 2)
- Corroded, damaged or loose connector pins at the switch or control module
- Incorrect previous repair or aftermarket accessory tied into the wiring
- Faulty body control module (BCM) or input driver (less common)
Symptoms
- Memory function related to the affected switch does not operate or behaves unpredictably
- Stored DTC and possibly a related warning or loss of memory feature
- Switch appears inactive or permanently 'on'
- No other drivability symptoms in most cases (electrical/comfort function only)
What to check
- Read and record freeze frame and all stored codes from the body/control module
- Visual inspection of wiring harness and connectors for the Memory 2 switch (look for damage, pin push-out, corrosion)
- Measure voltage at the Memory 2 switch connector with ignition ON and OFF
- Backprobe the switch connector while operating the switch to observe signal change
- Disconnect the Memory 2 switch; see if the DTC clears or signal changes
- Wiggle test harness while monitoring voltage to reproduce the fault
Signal parameters
- Battery voltage: ~12.0–14.5 V (normal vehicle range)
- Expected inactive/grounded input: near 0 V (0–0.5 V)
- Expected active/high input (when switch closed to B+): near battery voltage (>10.5 V)
- Fault condition: constant battery voltage present on circuit when switch should be open
Diagnostic algorithm
- Retrieve freeze frame and all related codes. Note ignition state and parameters when set.
- Visually inspect connectors and harness to/from the Memory 2 switch and body module. Repair obvious damage.
- With connector connected, backprobe the switch signal pin. Operate the switch and observe voltage; confirm whether it changes as expected.
- With ignition OFF and ON, measure the signal pin voltage. A persistent ~battery voltage with switch in its inactive position indicates a short to positive.
- Disconnect the Memory 2 switch connector. If the input at the control module remains at battery voltage, suspect wiring or module; if it goes to expected state, suspect the switch.
- Inspect continuity between the switch signal wire and known fused B+ circuits. Check for unintended connections (shorts) to the fused power feed or other harnesses.
- If wiring appears intact, test or replace the Memory 2 switch. Re-test for code presence.
- If fault persists with switch and harness repaired, test the control module input driver per manufacturer procedure; consider module replacement only after ruling out harness/switch.
- After repairs, clear codes and verify repair by cycling ignition and exercising the switch; confirm code does not return.
Likely causes
- Pin pushed out of connector contacting B+
- Wire insulation worn through and touching a B+ conductor or a fused power feed
- Memory 2 switch internal short (stuck at B+)
- Connector corrosion introducing conductive path to battery voltage
Fault status
Status
Memory 2 switch circuit short to positive detected on input — intermittent or permanent high voltage present on signal line.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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