Code
B1381
FIAT
B — Body
Oil change reset button open circuit
Views:
UK: 8
EN: 7
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the oil change reset switch circuit
- Disconnected, loose or corroded connector at the switch or control module
- Faulty oil change reset switch (mechanical/electrical failure)
- Poor ground or blown related fuse
- Intermittent contact from dirt, moisture or damage
- Faulty instrument cluster / body control module input (less common)
Symptoms
- Maintenance/oil-change reminder cannot be reset from dash
- Dash shows oil-change reset fault/malfunction indicator
- Pressing the reset button has no effect or works intermittently
- Related DTC(s) stored in instrument cluster or body control module
What to check
- Retrieve and record stored DTCs and freeze frame with a scan tool supporting manufacturer modules
- Visually inspect the switch, wiring harness, and connectors for damage, corrosion, moisture or pin push-out
- Check related fuses and grounds for integrity
- Operate the button while monitoring live data/inputs on a diagnostic tool (if available)
- Back-probe the switch connector and check for reference voltage and switch output while pressing the button
- Perform continuity/resistance check of the switch and between the switch connector and the control module connector
Signal parameters
- Switch closed (button pressed): low resistance typically ~0–5 ohms to signal/ground (model dependent)
- Switch open (button released): high resistance / open circuit -> >1 MΩ or infinite
- Reference voltage at switch feed (if used): typically ignition-switched 12 V or a 5 V reference from BCM — verify with vehicle wiring diagram
- Signal voltage at module input: should change between reference voltage and near 0 V when pressed (verify against manufacturer data)
Diagnostic algorithm
- Connect a manufacturer-capable scan tool. Read and record fault codes and any live data for the oil change reset input.
- Visually inspect the reset button, bezel and harness for damage, corrosion, moisture or foreign objects. Repair visible damage.
- With ignition ON, back-probe the switch connector. Verify reference voltage at the supply pin (12 V or 5 V depending on model).
- While monitoring the signal pin, press the reset button. Confirm the input signal changes (voltage or continuity) when pressed. If it does, problem may be intermittent or cosmetic; if not, proceed.
- Disconnect the switch and measure switch resistance with a multimeter: open = infinite, pressed = near 0 Ω. Replace switch if it fails this test.
- If switch tests good, check continuity between the switch connector and the receiving module connector (instrument cluster/BCM). Repair any open/short circuits, broken wires, or poor crimps.
- Inspect and clean connectors; repair corroded pins or replace connector assemblies as needed. Check and restore proper grounds and fuses.
- If wiring and switch are good but input does not change at module, suspect module input fault. Verify with wiring diagrams and consider module repair/replacement only after confirming wiring and switch integrity.
- Clear codes and verify proper function by performing the oil-change reset procedure and monitoring for return of the DTC.
- Safety note: use manufacturer wiring diagrams and safe procedures when probing connectors; do not short circuits or power modules incorrectly.
Likely causes
- Corroded or disconnected connector at the reset switch
- Broken/abraded wire in harness near switch or hinge points
- Failed/reset switch due to wear or contamination
- Loose or damaged connector pins at instrument cluster or BCM
Fault status
Status
B1381 — Oil change reset button open circuit detected (open/disconnected switch or wiring).
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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