Code
B1310
FIAT
B — Body
Door opening circuit
Views:
UK: 18
EN: 32
RU: 26
AI status
Completed
Completed
100%
Causes
- Damaged or disconnected wiring harness in door area
- Corroded/loose connector (door jamb, door module, BCM)
- Faulty door open/handle switch or microswitch
- Failed door module or BCM output driver
- Blown fuse or poor ground
- Water ingress or mechanical damage to switch/actuator
Symptoms
- Door ajar warning lamp or message on instrument cluster
- Interior lights not turning off/on as expected with door operation
- Central locking or remote open may not function for that door
- Inconsistent door open status (intermittent)
- Possible inability to open/close door using electronic release
What to check
- Scan for stored/freeze-frame data and note fault occurrence pattern (static or intermittent)
- Visual inspection of door wiring boots, connectors, latch and handle area for damage or corrosion
- Verify fuses related to body control/door modules
- Operate the door switch/handle and observe live data for door state in the scan tool
- Measure supply voltage and ground at the door switch and module connector
- Check continuity/resistance of wiring between switch and BCM with door open/closed
Signal parameters
- Nominal battery supply at switch/module: ~12V (check with ignition on)
- Switch output: typically 0V (ground) or ~12V when activated depending on vehicle wiring (verify exact behaviour with scan tool)
- Open circuit expected resistance: very high/infinite when switch open; low (near 0Ω) when closed (measure with multimeter)
- CAN or serial bus messages: door status bit should change when switch operated (monitor with diagnostic tool)
Diagnostic algorithm
- Read and record all body module faults and live door status with a compatible diagnostic tool. Note whether fault is permanent or intermittent.
- Reproduce the symptom: operate the affected door open/close several times while watching live data and indicators.
- Perform visual inspection: check door latch, handle, switches, wiring harness through the door boot, and connectors for corrosion, pin damage or water.
- Verify related fuse(s) and test ground integrity for the door/BCM circuits.
- Backprobe the door switch connector and/or latch connector: confirm supply voltage, ground and the signal change when operating switch. Compare to expected behavior.
- If signal is missing or incorrect, perform continuity/insulation checks between the switch and BCM connector with door at various positions; look for opens/shorts or high resistance.
- Wiggle test harness while monitoring live data to find intermittent breaks in the boot area.
- If wiring and connectors are good but signal driver does not respond, check for BCM outputs and related CAN/communication faults. If module output is faulty, consider module repair/replacement per manufacturer procedure.
- Repair identified wiring/connectors or replace defective switch/latch. After repair, clear codes and verify fault does not return and door status works normally over multiple cycles.
Likely causes
- Intermittent open or short in the door switch wiring at the hinge/boot
- Corroded connector at door latch or BCM causing loss of signal
- Defective door handle or latch switch (failed contacts)
- Module output stage damaged after moisture exposure
Fault status
Status
Door opening circuit fault detected (B1310). Possible open/short or component failure in door switch/latch wiring or module. Inspect wiring, connectors and door switch; test with diagnostic tool; repair as required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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