What Does B1475 Mean?
This code indicates the Body Control Module (BCM) has detected that the accessory delay relay coil or its control circuit is shorted to battery voltage when it should not be energized. The accessory delay relay allows certain electrical accessories (radio, power windows, interior lights) to remain powered for a set time after the ignition is turned off. The BCM detected unexpected voltage on the relay control circuit, meaning the relay may be stuck closed or there is a wiring fault providing constant power.
Common Causes
35%
Shorted or damaged wiring in the accessory delay relay control circuit creating a direct path to battery voltage
30%
Failed accessory delay relay with internal short circuit causing contacts to remain closed or coil shorted internally
20%
Faulty Body Control Module with internal short in relay driver circuit
10%
Corrosion or water intrusion in relay socket or connector causing cross-circuit short to power
5%
Chafed or pinched wiring harness where insulation is worn through creating intermittent short to battery voltage
Diagnostic Steps
1
Step 1: Perform visual inspection of the accessory delay relay location (typically in underhood or underdash fuse/relay box). Remove relay and inspect socket for corrosion, melted terminals, or signs of water intrusion. Check relay pins for damage or burning.
2
Step 2: With relay removed and ignition off, use a digital multimeter to measure voltage at the relay control terminal in the socket. Reading should be 0 volts; any battery voltage present (12+ volts) confirms a short to power in the wiring or BCM.
3
Step 3: If voltage is present at socket, disconnect the BCM connector and retest the relay control circuit at the socket. If voltage disappears, BCM has internal short and requires replacement. If voltage remains, trace wiring harness from relay socket to BCM checking for chafed, pinched, or damaged wires contacting power sources.
4
Step 4: If no voltage found at socket with relay removed, test the relay itself using an ohmmeter across the coil terminals (should read 50-120 ohms typically) and check for continuity across contact terminals (should be open with relay de-energized). Replace relay if internal short is detected.
5
Step 5: Reinstall relay (new if defective) and clear codes. Monitor accessory function after key-off to verify proper timed operation. Use scan tool to command relay on/off if available to verify BCM control and proper relay operation. Verify code does not return.
Estimated Repair Cost
$75 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the accessory delay relay coil or its control circuit is shorted to battery voltage when it should not be energized. The accessory delay relay allows certain electrical accessories (radio, power windows, interior lights) to remain p...
The most common cause of B1475 (Accessory Delay Relay Contact Short To Battery) is: Shorted or damaged wiring in the accessory delay relay control circuit creating a direct path to battery voltage
Typical repair costs for B1475 range from $75 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but accessories may remain powered continuously causing battery drain and potential dead battery condition. Prolonged exposure could damage BCM or cause relay/wiring overheating. Repair within a few days to prevent battery discharge and potential electrical system damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1475 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
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