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Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/why does my BMW 3 Series F30/F31 (2012-2019) keep running after I turn off the ignition?

why does my BMW 3 Series F30/F31 (2012-2019) keep running after I turn off the ignition?

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: medium2-4 hours
3 min read
493 words

Problem Statement

## Problem Statement The BMW 3 Series F30/F31 (2012-2019) continues to run after the ignition is turned off, indicating a potential issue with the engine management system or the ignition switch.

Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical systems to prevent shorts.
  • ⚠Allow the engine to cool before performing any repairs to avoid burns.

Symptoms

  • •Engine continues to run after ignition is turned off
  • •Dashboard lights remain illuminated
  • •Possible electrical system malfunction (e.g., battery drain)
  • •Irregular operation of power accessories (windows, locks)
  • •Difficulty restarting the vehicle

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
  2. 2Inspect the ignition switch for signs of wear or damage.
  3. 3Check the battery terminals for corrosion or loose connections.
  4. 4Test the engine control unit (ECU) for proper functionality and any software updates.
  5. 5Inspect the wiring harness for any shorts or damaged wires, especially around the ignition system.
  6. 6Verify the operation of the fuel relay and other related relays.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Switch

  • Tools Required: Screwdriver set, multimeter, replacement ignition switch
  • Sub-steps:
    1. Remove the cover panel around the steering column using the screwdriver.
    2. Locate the ignition switch and disconnect the electrical connector.
    3. Test the ignition switch with a multimeter to ensure it properly opens and closes circuits.
    4. If faulty, install the new ignition switch by reversing the removal process and reconnecting the electrical connector.

3. Check and Repair Wiring

  • Tools Required: Multimeter, wire strippers, electrical tape
  • Sub-steps:
    1. Visually inspect the wiring harness for any signs of wear or damage.
    2. Use a multimeter to check for continuity in the relevant wires.
    3. If any wires are damaged, strip the ends and splice in new wire as needed, then insulate with electrical tape.

4. Test and Replace Relays

  • Tools Required: Relay tester or multimeter
  • Sub-steps:
    1. Locate the fuse box and identify the fuel relay and other related relays.
    2. Test the relays using the relay tester or multimeter.
    3. Replace any faulty relays with new ones.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • Sub-steps:**
  • Remove the cover panel around the steering column using the screwdriver.
  • Locate the ignition switch and disconnect the electrical connector.
  • Test the ignition switch with a multimeter to ensure it properly opens and closes circuits.

Parts Required

  • Ignition switch
  • Replacement wiring (if needed)
  • Relays (if needed)

Additional Information

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

4 items

Parts

3 items

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