Code
B1528
FIAT
B — Body
Memory enable switch circuit open
Views:
UK: 7
EN: 8
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the memory enable switch circuit
- Faulty memory enable switch (mechanical/electrical failure)
- Poor connector contact or corrosion at switch or control module
- Blown fuse or power loss to circuit
- Control module (BCM) internal fault or software issue
- Incorrect installation or damage after repairs (pinched wire)
Symptoms
- Memory functions (seat, mirrors, steering wheel) do not enable or recall
- No response when pressing memory enable switch
- Memory-related warning or message on dash (if equipped)
- Intermittent or permanent loss of memory operation
- Stored memory positions not activated on key selection
What to check
- Scan ECU(s) and read freeze frame/related codes; clear and re-scan after tests
- Visual inspection of switch, harness, and connectors for damage, corrosion or loose pins
- Check relevant fuses for continuity and correct rating
- With ignition ON, verify reference supply voltage to the switch using wiring diagram to locate terminals
- Measure continuity between the switch and the control module connector (ignition off)
- Wiggle test the harness/connector while monitoring signal to reproduce intermittent faults
Signal parameters
- Reference supply to switch: battery voltage with ignition ON (typically ~11–14 V)
- Switch closed output: typically pulled to ground or to a low-voltage logic level — should change state when actuated
- Open-circuit state: high impedance or no continuity between switch and BCM
- Continuity: closed switch should show low resistance (near 0 Ω); open switch should show OL/infinite
- Connector ground continuity:
- Use scan tool to monitor input status to BCM when actuating switch (ON/OFF)
Diagnostic algorithm
- Obtain vehicle-specific wiring diagram and identify memory enable switch, fuses and BCM pins.
- Read and record all stored DTCs and freeze frame data; note whether other body/network codes are present.
- Perform visual inspection of the switch, harness, connectors and nearby body panels for damage, corrosion or water ingress.
- Check relevant fuses and relays; replace any blown fuses and re-test.
- With ignition OFF, disconnect the switch connector and perform a continuity/resistance check across switch terminals to verify switch operation (closed vs open).
- With ignition ON, back-probe the switch connector: verify supply voltage, ground reference, and that the signal changes when actuating the switch. Compare to vehicle-specific expected values.
- Check continuity from the switch signal pin to the BCM input pin; repair any open circuits (splice, harness damage, connector).
- If wiring and switch test good but input never changes at the BCM, test/replace connector pins or consider BCM input fault — verify grounds and power to BCM first.
- After repairs, clear codes, operate the memory system through several cycles and verify the fault does not return. If intermittent, perform road/operational checks to reproduce.
- If wiring and switch are confirmed good and BCM input is suspected, consult manufacturer procedures for BCM self-tests, reprogramming or replacement.
Likely causes
- Broken wire or damaged insulation between switch and BCM
- Corroded or loose connector at the switch or BCM
- Failed memory enable switch contacts
- Blown fuse supplying the switch circuit
- Connector pin pushed out or bent
- Intermittent BCM input due to internal fault
Fault status
Status
Memory enable switch circuit open — switch signal not detected by the control module. Inspect switch, wiring, connectors, fuses and BCM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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