Code
B1528
ALFA ROMEO
B — Body
Memory enable switch circuit open
Views:
UK: 6
EN: 11
RU: 9
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring in the memory enable switch circuit
- Corroded or loose connector at switch or control module
- Faulty memory enable switch (mechanical/electrical failure)
- Blown / open fuse or power supply issue to the switch or module
- Failed body/seat control module or internal input circuit open
- Aftermarket accessories or previous repairs that damaged wiring
Symptoms
- Memory seat/mirror buttons do not enable or store positions
- Memory recall does not operate or is intermittent
- No response from memory-related controls
- DTC lamp or stored fault in body/seat module
- Possible related functionality loss (seat adjustment memory features)
What to check
- Confirm exact function affected by the code (seat, mirror, etc.)
- Scan for additional body/seat module faults
- Visually inspect switch, nearby wiring, and connectors for damage or corrosion
- Check relevant fuses and vehicle battery voltage
- Perform wiggle test on harness while observing scan tool or function
- Measure voltage and continuity at switch and module connector
Signal parameters
- Expected supply voltage to switch: approximately 9–15 V with key on (verify with wiring diagram)
- Switch output: either ground control or switched +12 V depending on model — should change state when pressed
- Open-circuit condition: infinite resistance between switch signal pin and module signal pin when switch is actuated
- Typical continuity: near 0 Ω through switch contacts when closed (multimeter), high/OL when open
- Module input idle state: see wiring diagram for pull-up/pull-down specifics before measuring
Diagnostic algorithm
- Use a compatible diagnostic scanner to confirm B1528 and note any additional codes or freeze frame data.
- Obtain the vehicle wiring diagram for the memory enable switch circuit and identify connector pinouts, fuses, and module location.
- Visually inspect the switch assembly, connectors, and associated harness for damage, corrosion, water ingress, or loose pins.
- Verify power and ground: check fuse(s) feeding the switch and ensure battery voltage present at the switch power terminal with ignition on.
- With ignition on, backprobe the switch signal wire and observe voltage while operating the switch. Compare to expected behavior from wiring diagram (signal should change state when pressed).
- Check continuity between the switch signal pin and the control module signal pin. If open, isolate by testing intermediate connectors/sections of harness.
- If wiring and connectors show good continuity and correct voltages, bench-test or replace the memory enable switch and retest.
- If the switch replacement does not correct the fault and wiring is good, suspect the control module input. Perform module input checks per manufacturer procedures; replace module only after confirming module fault.
- After repairs, clear the code and perform functional test of memory features. Re-scan to confirm the code does not return.
Likely causes
- Open/harshly bent wire or pinched harness to the memory switch
- Connector pins pushed out or corroded causing loss of continuity
- Switch contacts worn or stuck open
- Blown fuse supplying the switch/module
- Module input driver damaged (less common)
Fault status
Status
Stored when the control module detects an open circuit (no signal) on the memory enable switch input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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