B1339
Chime Input Request Circuit Short To Battery
Body Chassis/Safety Body Control Electronics 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The chime/bell system in your car is receiving too much electrical power, like a wire touching the positive battery terminal instead of being properly grounded. The body control module detected this abnormal voltage spike on the chime circuit.

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Symptoms You May Notice
3 known symptoms for this code
Chime sounds constantly or at inappropriate times
No chime sound when doors open or seat belts unbuckle
Dashboard warning lights may flicker or behave erratically
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Embedded Systems Insight
What the ECU/ECM is actually computing

The body control module monitors the voltage on the chime request signal circuit, expecting it to toggle between ground (0V) and a low control voltage (typically 5V or 12V depending on design). When the circuit shorts directly to battery voltage (12V+), the module detects an overvoltage condition that exceeds safe operating thresholds.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Chime Input Voltage 0V to 5V (or 0V to control voltage) Sustained 12V+ or battery voltage
Signal Transition Time Normal digital switching pattern Stuck high or unable to transition to ground
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Chime wiring harness
Inspect the chime input wire for damage, pinches, or insulation breaks that expose bare conductor to nearby battery positive terminals.
2
Chime module connector
Disconnect and reseat the chime module connector firmly, cleaning any corrosion from the pins with a dry cloth.
3
Chime module
If wiring is intact, replace the chime module as it may have internal short-to-battery damage.