What Does B1392 Mean?
This code indicates the Body Control Module (BCM) has detected an electrical fault in the power door memory lock relay circuit. The system monitors the relay that controls the locking mechanism for power door memory positions, and has identified either an open circuit, short circuit, or relay failure preventing proper operation. This affects the convenience feature that automatically adjusts and locks door position settings based on driver memory profiles.
Common Causes
40%
Faulty power door memory lock relay with internal coil or contact failure
30%
Damaged or corroded wiring harness between BCM and door lock relay
20%
Poor ground connection or corroded ground point for door memory circuit
10%
Faulty Body Control Module with failed relay driver circuit
Diagnostic Steps
1
Step 1: Locate the power door memory lock relay (typically in underdash fuse/relay panel or door control module). Visually inspect relay, socket, and associated wiring for signs of corrosion, burning, or physical damage. Check for loose connections at relay socket.
2
Step 2: Remove relay and check socket terminals for proper voltage supply. Use digital multimeter to verify battery voltage (12-14V) at power supply terminal with ignition on. Check for continuity to ground on ground terminal (should read less than 1 ohm resistance).
3
Step 3: Test relay operation by swapping with an identical relay from another circuit if available, or bench test removed relay using external 12V power source and multimeter to verify coil resistance (typically 70-100 ohms) and contact closure when energized.
4
Step 4: If relay tests good, use multimeter to backprobe BCM connector and check for control signal output to relay coil when memory lock function is activated. Should see voltage switching from 0V to 12V or ground switching depending on relay type.
5
Step 5: Inspect wiring harness from BCM to relay for chafing, pinching, or breaks. Pay special attention to areas where harness passes through door jamb or under seats. Perform continuity test on all circuit wires between BCM and relay with connectors disconnected.
6
Step 6: If all wiring and relay test good, suspect BCM internal relay driver failure. Clear codes, reinstall all components, and perform memory door lock function test to verify repair. Monitor for code return during multiple test cycles.
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an electrical fault in the power door memory lock relay circuit. The system monitors the relay that controls the locking mechanism for power door memory positions, and has identified either an open circuit, short circuit, or relay failur...
The most common cause of B1392 (Power Door Memory Lock Relay Circuit Failure) is: Faulty power door memory lock relay with internal coil or contact failure
Typical repair costs for B1392 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects a convenience feature. The power door memory lock function will not operate, but basic door operation and manual adjustments remain functional. Repair at convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1392 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical and Comfort Systems
Difficulty
Type
Manufacturer
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