What Does B1340 Mean?
B1340 indicates the Body Control Module (BCM) has detected a short to ground condition in the chime input request circuit. This circuit is responsible for activating the audible warning chime system when various vehicle conditions require driver notification (doors ajar, lights on, seatbelt warnings, etc.). The BCM has identified that the signal wire is creating an unintended path to ground, causing abnormal circuit operation.
Common Causes
45%
Damaged or chafed wiring harness between BCM and chime module causing short to ground
30%
Failed chime module with internal short to ground
15%
Corroded or damaged connector pins at BCM or chime module creating ground path
10%
Faulty Body Control Module with internal circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring between BCM and chime module, checking for pinched, chafed, or damaged insulation especially near metal body panels and sharp edges
2
Step 2: Disconnect chime module connector and measure resistance from chime input circuit wire to ground using digital multimeter - should read infinite resistance (open circuit); if less than 10k ohms, wiring harness has short to ground
3
Step 3: If wiring tests good, disconnect BCM connector and measure resistance of chime input pin at BCM connector to ground - infinite resistance indicates BCM internal fault, low resistance confirms harness fault between connectors
4
Step 4: Inspect all connector terminals for corrosion, bent pins, or moisture intrusion using magnification; clean or repair as needed
5
Step 5: If all wiring and connections test good, perform chime module functional test by applying proper voltage to input circuit (consult service manual for specifications) - chime should activate normally
6
Step 6: Clear codes, reconnect all components, cycle ignition and verify chime operation through various trigger conditions (door open, key in ignition); rescan for code return
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
B1340 indicates the Body Control Module (BCM) has detected a short to ground condition in the chime input request circuit. This circuit is responsible for activating the audible warning chime system when various vehicle conditions require driver notification (doors ajar, lights on, seatbelt warnings...
The most common cause of B1340 (Chime Input Request Circuit Short To Ground) is: Damaged or chafed wiring harness between BCM and chime module causing short to ground
Typical repair costs for B1340 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. The warning chime may not function properly to alert driver of important conditions like open doors, lights left on, or unfastened seatbelts. Repair at earliest convenience to restore proper audible warnings.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1340 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Warning Chime
Difficulty
Type
Manufacturer
Recommended Tools
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