What Does B1374 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal short circuit to ground in the illuminated entry relay circuit. The illuminated entry system provides interior and exterior lighting when doors are unlocked or opened. The BCM detected current flow on the relay control circuit that is lower than expected specifications, indicating an unintended path to ground in the wiring or relay coil circuit.
Common Causes
40%
Damaged or chafed wiring harness creating direct ground contact between relay control circuit and vehicle chassis
30%
Failed illuminated entry relay with internal short to ground in coil windings
20%
Corroded or moisture-damaged connector terminals at relay or BCM causing ground short
10%
Failed Body Control Module with internal driver circuit shorted to ground
Diagnostic Steps
1
Step 1: Perform visual inspection of illuminated entry relay and associated wiring harness for obvious damage, chafing against metal surfaces, pinched wires at door hinges, or corrosion at connectors. Check for moisture intrusion in relay socket and BCM connectors.
2
Step 2: Locate and remove the illuminated entry relay from its socket. Using a digital multimeter set to ohms, measure resistance between the relay control circuit terminal at the relay socket and known good chassis ground with ignition off. Reading should be infinite (open circuit); any continuity indicates wiring short to ground.
3
Step 3: If wiring tests good, test the removed relay coil resistance between control terminals (typically 70-120 ohms for automotive relays). Also check for continuity between either coil terminal and relay case/mounting bracket; any continuity indicates internal relay short to ground.
4
Step 4: Disconnect BCM connector and inspect terminals for corrosion, pushed-back pins, or moisture. With BCM disconnected, retest relay control circuit to ground; if short disappears, BCM internal fault is confirmed. If short remains, trace and repair wiring harness between relay socket and BCM connector.
5
Step 5: After repairs, clear codes and cycle ignition. Operate door locks and manually trigger illuminated entry function multiple times to verify relay operation and confirm code does not return.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal short circuit to ground in the illuminated entry relay circuit. The illuminated entry system provides interior and exterior lighting when doors are unlocked or opened. The BCM detected current flow on the relay control circui...
The most common cause of B1374 (Illuminated Entry Relay Short To Ground) is: Damaged or chafed wiring harness creating direct ground contact between relay control circuit and vehicle chassis
Typical repair costs for B1374 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects convenience lighting features. The illuminated entry function may not work, causing reduced visibility when entering vehicle at night, but does not affect vehicle operation or critical safety systems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1374 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Lighting Control
Difficulty
Type
Manufacturer
Recommended Tools
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