Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1394 — Sliding door memory locking relay short to positive

B1394 — Sliding door memory locking relay short to positive

Detailed page for trouble code B1394.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1394

ALFA ROMEO B — Body

Sliding door memory locking relay short to positive

Brand: ALFA ROMEO
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short circuit in relay control wiring to battery positive
  • Faulty or stuck sliding door memory/locking relay (internally shorted)
  • Corroded or damaged connector at the relay or door harness
  • Pinched or chafed wiring in sliding door harness (door hinge area)
  • Faulty body control module (BCM) or relay driver transistor
  • Aftermarket accessory tied into locking circuit creating a feed to positive

Symptoms

  • Sliding door memory locking/unlocking does not operate or is intermittent
  • Door locks may remain locked or unlocked and not respond to commands
  • Blown fuse(s) on door/lock circuit or repeated fuse failures
  • Battery drain when vehicle is off (rare)
  • Malfunction indicator or body system warning lamp may be present

What to check

  • Read stored freeze-frame and live data with a diagnostic scanner; note related codes
  • Visually inspect relay, relay socket, fuses, and connectors for corrosion, melting, or damage
  • Inspect sliding door harness at hinge/b-pillar for pinching, wear, or exposed conductor
  • With ignition off, disconnect the relay and check for continuity between the control terminal and battery positive
  • With ignition on and code active, measure voltage at relay control pin (expect ~0V inactive, ~battery voltage when driven); look for permanent battery positive
  • Check fuses for the lock/door circuit and replace if blown; retest

Signal parameters

  • Relay control circuit expected: near 0 V (ground/low) when inactive
  • Relay control circuit expected: near battery voltage (11–14 V) when the module commands relay energize
  • A short to positive will show battery voltage present at the control pin regardless of command
  • Continuity between control wire and battery positive with ignition off indicates a short
  • No continuity to chassis ground expected on a control feed unless the module is commanding a ground

Diagnostic algorithm

  1. Retrieve and record trouble codes and freeze-frame data. Clear codes and attempt to re‑create the fault to confirm repeatability.
  2. Perform a visual inspection of the sliding door harness, door hinge area, relay, relay socket, and associated connectors for damage, corrosion, pinching, or foreign objects.
  3. Remove power to circuit (disconnect battery if needed for safety) and disconnect the relay. Check for continuity between the control terminal and battery positive. If continuity exists, trace wiring to find short to positive.
  4. With a DVOM, measure voltage at the relay control terminal with ignition ON while operating the lock/memory function. If battery voltage is present when the module is not commanding, there is a short to positive or backfeed.
  5. Swap in a known-good relay or bench-test the relay to confirm relay is not internally shorted.
  6. If wiring appears intact, disconnect the sliding door harness connectors progressively to isolate the short location (door side vs. body harness). Test each section for presence of battery positive on the control wire.
  7. Inspect/repair any damaged wiring, replace corroded connectors, or repair pinched sections. Secure harness away from pinch points at hinges.
  8. If wiring and relay are good, test BCM/driver output for shorted transistor. Replace BCM only after confirming wiring and relay are good and module is the only possible cause.
  9. After repair, clear codes, test function repeatedly, and road/operate door cycles to ensure code does not return.

Likely causes

  • Damaged/chafed wire in harness at sliding door hinge (most common)
  • Relay internal short or welded contacts
  • Water intrusion/corrosion at connector causing a positive feed
  • BCM output driver failed shorted to battery

Fault status

⚠️ Status
Sliding door memory locking relay control circuit shorted to positive (battery) — check relay, wiring, connectors, fuses and BCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1390 B1391 B1392 B1395 B1396
89

Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ALFA ROMEO

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

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .