What Does B1360 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the ignition run/accessory power supply circuit. The BCM monitors voltage on the ignition run and accessory circuits to manage vehicle electrical systems and has detected a loss of expected voltage or continuity. This prevents proper power distribution to various electrical components when the ignition is in the RUN or ACC position.
Safety Warning
Vehicle may experience intermittent starting issues, loss of power to critical systems, or complete failure to start. Not safe to rely on for daily transportation until repaired as failure may occur without warning.
Common Causes
35%
Faulty ignition switch with internal contact failure or wear preventing proper circuit closure in RUN/ACC positions
30%
Broken, corroded, or loose wiring/connections between ignition switch and BCM in the RUN/ACC power circuit
20%
Blown fuse or defective fusible link in the ignition RUN/ACC power distribution circuit
10%
Faulty Body Control Module with internal circuit failure preventing proper detection of ignition power
5%
Damaged ignition lock cylinder mechanism preventing complete switch rotation or contact engagement
Diagnostic Steps
1
Step 1: Perform visual inspection of ignition switch connector and BCM connectors for corrosion, bent pins, or loose connections. Check for proper seating and terminal tension.
2
Step 2: With ignition OFF, use a multimeter to check continuity and resistance in the wiring between the ignition switch RUN/ACC output terminal and the BCM input terminal. Compare readings to factory specifications (typically less than 5 ohms).
3
Step 3: Check all fuses and fusible links related to ignition RUN and ACC circuits using a test light or multimeter. Verify both sides of fuses have power when ignition is in RUN/ACC position.
4
Step 4: With multimeter connected to ignition switch output terminal, cycle ignition through OFF, ACC, and RUN positions while monitoring voltage. Should see battery voltage in ACC and RUN positions (typically 12-14V).
5
Step 5: If ignition switch shows proper voltage output but BCM shows open circuit, inspect and test wiring harness for internal breaks using voltage drop testing under load or wiggle test while monitoring live data.
6
Step 6: If all wiring and connections test good, perform BCM power supply tests and consider BCM replacement or ignition switch replacement based on findings. Clear codes and verify repair by cycling ignition and monitoring for code return.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the ignition run/accessory power supply circuit. The BCM monitors voltage on the ignition run and accessory circuits to manage vehicle electrical systems and has detected a loss of expected voltage or continuity. This ...
The most common cause of B1360 (Ignition Run/Acc Circuit Open) is: Faulty ignition switch with internal contact failure or wear preventing proper circuit closure in RUN/ACC positions
Typical repair costs for B1360 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience intermittent starting issues, loss of power to critical systems, or complete failure to start. Not safe to rely on for daily transportation until repaired as failure may occur without warning.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1360 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
Recommended Tools
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