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Home / DTC / B1393 — Electric door memory locking relay open circuit

B1393 — Electric door memory locking relay open circuit

Detailed page for trouble code B1393.

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Code

B1393

ALFA ROMEO B — Body

Electric door memory locking relay open circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 2 EN: 7 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed/defective electric door memory locking relay
  • Open or damaged wiring in relay supply or control circuit
  • Corroded/loose relay connector or terminal
  • Blown fuse protecting the relay circuit
  • Faulty body control module (BCM) or module output stage
  • Water ingress or contamination at connector or relay

Symptoms

  • Door memory locking function inoperative or intermittent
  • Central locking does not lock/unlock when memory command is used
  • Dash message or alarm indicating locking failure
  • Related convenience features (memory seats/mirrors) may not operate correctly
  • DTC B1393 stored in BCM on scan tool

What to check

  • Read and record freeze-frame and all stored codes with a compatible diagnostic tool
  • Visually inspect relay, relay socket and nearby harness for damage, corrosion or water ingress
  • Check fuses related to door locks/memory locking for continuity
  • Wiggle-test harness and connectors while operating lock command to reproduce fault
  • Swap relay with identical, known-good relay of same part number (if available)
  • Use a multimeter to check supply voltage to the relay power terminal (should be battery voltage)

Signal parameters

  • Relay supply: ~12 V battery (present at relay power pin with key on or as specified by vehicle wiring)
  • Control/coil: switched 0–12 V signal from BCM (may be switched to ground or +12 V depending on design)
  • When energized: relay contact continuity should be low ohms (< a few ohms) between switched terminals
  • When not energized: open circuit across switched relay contacts

Diagnostic algorithm

  1. Connect diagnostic scanner, read and note B1393 and any related codes; clear codes and attempt to reproduce with the scan tool monitoring live data
  2. Verify appropriate fuses for door lock/memory circuits and replace any blown fuses
  3. Locate the relay in the vehicle fuse/relay box; perform visual inspection for corrosion or heat damage
  4. Swap the suspect relay with an identical known-good relay to see if the fault clears (if available)
  5. Backprobe relay socket: with the lock memory command active, verify battery voltage at supply terminal and verify a change (0V to 12V or vice versa) at the coil control terminal — if no control signal, suspect BCM or wiring
  6. If supply is present but relay does not energize, bench-test or substitute relay; if relay fails bench test replace it
  7. If relay operates but circuit downstream open, check continuity from relay output to lock actuator and to vehicle ground; repair any open wires or connectors
  8. Inspect and repair any damaged connectors or harness sections; clean corroded terminals and apply dielectric grease
  9. If wiring and relay check good but no control signal from BCM, test BCM outputs per factory procedure and consider module repair/reprogramming or replacement
  10. After repairs, clear codes and perform functional test of memory locking; road test and rescan to confirm code does not return

Likely causes

  • Failed or internally open relay (most common)
  • Broken wire or pinched harness between relay and BCM/actuator
  • Corroded connector at relay or fusebox preventing continuity
  • Blown fuse supplying relay coil or contacts

Fault status

⚠️ Status
B1393 — Electric door memory locking relay circuit open. Check relay, fuse, wiring and BCM output.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1392 B1391 B1380 B1400 B1320
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Code

B1393

FIAT B — Body

Electric door memory locking relay open circuit

Brand: FIAT
Type: B — Body
Views: UK: 3 EN: 6 RU: 2
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed/defective electric door memory locking relay
  • Open or damaged wiring in relay supply or control circuit
  • Corroded/loose relay connector or terminal
  • Blown fuse protecting the relay circuit
  • Faulty body control module (BCM) or module output stage
  • Water ingress or contamination at connector or relay

Symptoms

  • Door memory locking function inoperative or intermittent
  • Central locking does not lock/unlock when memory command is used
  • Dash message or alarm indicating locking failure
  • Related convenience features (memory seats/mirrors) may not operate correctly
  • DTC B1393 stored in BCM on scan tool

What to check

  • Read and record freeze-frame and all stored codes with a compatible diagnostic tool
  • Visually inspect relay, relay socket and nearby harness for damage, corrosion or water ingress
  • Check fuses related to door locks/memory locking for continuity
  • Wiggle-test harness and connectors while operating lock command to reproduce fault
  • Swap relay with identical, known-good relay of same part number (if available)
  • Use a multimeter to check supply voltage to the relay power terminal (should be battery voltage)

Signal parameters

  • Relay supply: ~12 V battery (present at relay power pin with key on or as specified by vehicle wiring)
  • Control/coil: switched 0–12 V signal from BCM (may be switched to ground or +12 V depending on design)
  • When energized: relay contact continuity should be low ohms (< a few ohms) between switched terminals
  • When not energized: open circuit across switched relay contacts

Diagnostic algorithm

  1. Connect diagnostic scanner, read and note B1393 and any related codes; clear codes and attempt to reproduce with the scan tool monitoring live data
  2. Verify appropriate fuses for door lock/memory circuits and replace any blown fuses
  3. Locate the relay in the vehicle fuse/relay box; perform visual inspection for corrosion or heat damage
  4. Swap the suspect relay with an identical known-good relay to see if the fault clears (if available)
  5. Backprobe relay socket: with the lock memory command active, verify battery voltage at supply terminal and verify a change (0V to 12V or vice versa) at the coil control terminal — if no control signal, suspect BCM or wiring
  6. If supply is present but relay does not energize, bench-test or substitute relay; if relay fails bench test replace it
  7. If relay operates but circuit downstream open, check continuity from relay output to lock actuator and to vehicle ground; repair any open wires or connectors
  8. Inspect and repair any damaged connectors or harness sections; clean corroded terminals and apply dielectric grease
  9. If wiring and relay check good but no control signal from BCM, test BCM outputs per factory procedure and consider module repair/reprogramming or replacement
  10. After repairs, clear codes and perform functional test of memory locking; road test and rescan to confirm code does not return

Likely causes

  • Failed or internally open relay (most common)
  • Broken wire or pinched harness between relay and BCM/actuator
  • Corroded connector at relay or fusebox preventing continuity
  • Blown fuse supplying relay coil or contacts

Fault status

⚠️ Status
B1393 — Electric door memory locking relay circuit open. Check relay, fuse, wiring and BCM output.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1392 B1391 B1380 B1400 B1320
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1393

Other B — Body

Power Door Memory Lock Relay Circuit Open

Brand: Other
Type: B — Body
Views: UK: 12 EN: 23 RU: 10
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed/defective electric door memory locking relay
  • Open or damaged wiring in relay supply or control circuit
  • Corroded/loose relay connector or terminal
  • Blown fuse protecting the relay circuit
  • Faulty body control module (BCM) or module output stage
  • Water ingress or contamination at connector or relay

Symptoms

  • Door memory locking function inoperative or intermittent
  • Central locking does not lock/unlock when memory command is used
  • Dash message or alarm indicating locking failure
  • Related convenience features (memory seats/mirrors) may not operate correctly
  • DTC B1393 stored in BCM on scan tool

What to check

  • Read and record freeze-frame and all stored codes with a compatible diagnostic tool
  • Visually inspect relay, relay socket and nearby harness for damage, corrosion or water ingress
  • Check fuses related to door locks/memory locking for continuity
  • Wiggle-test harness and connectors while operating lock command to reproduce fault
  • Swap relay with identical, known-good relay of same part number (if available)
  • Use a multimeter to check supply voltage to the relay power terminal (should be battery voltage)

Signal parameters

  • Relay supply: ~12 V battery (present at relay power pin with key on or as specified by vehicle wiring)
  • Control/coil: switched 0–12 V signal from BCM (may be switched to ground or +12 V depending on design)
  • When energized: relay contact continuity should be low ohms (< a few ohms) between switched terminals
  • When not energized: open circuit across switched relay contacts

Diagnostic algorithm

  1. Connect diagnostic scanner, read and note B1393 and any related codes; clear codes and attempt to reproduce with the scan tool monitoring live data
  2. Verify appropriate fuses for door lock/memory circuits and replace any blown fuses
  3. Locate the relay in the vehicle fuse/relay box; perform visual inspection for corrosion or heat damage
  4. Swap the suspect relay with an identical known-good relay to see if the fault clears (if available)
  5. Backprobe relay socket: with the lock memory command active, verify battery voltage at supply terminal and verify a change (0V to 12V or vice versa) at the coil control terminal — if no control signal, suspect BCM or wiring
  6. If supply is present but relay does not energize, bench-test or substitute relay; if relay fails bench test replace it
  7. If relay operates but circuit downstream open, check continuity from relay output to lock actuator and to vehicle ground; repair any open wires or connectors
  8. Inspect and repair any damaged connectors or harness sections; clean corroded terminals and apply dielectric grease
  9. If wiring and relay check good but no control signal from BCM, test BCM outputs per factory procedure and consider module repair/reprogramming or replacement
  10. After repairs, clear codes and perform functional test of memory locking; road test and rescan to confirm code does not return

Likely causes

  • Failed or internally open relay (most common)
  • Broken wire or pinched harness between relay and BCM/actuator
  • Corroded connector at relay or fusebox preventing continuity
  • Blown fuse supplying relay coil or contacts

Fault status

⚠️ Status
B1393 — Electric door memory locking relay circuit open. Check relay, fuse, wiring and BCM output.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1392 B1391 B1380 B1400 B1320
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