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Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/my BMW 3 Series F30/F31 (2012-2019) has no power when I turn the key, is it the starter?

my BMW 3 Series F30/F31 (2012-2019) has no power when I turn the key, is it the starter?

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: medium1-4 hours depending on parts replacement.
3 min read
537 words

Problem Statement

## Problem Statement The vehicle, a BMW 3 Series F30/F31 (2012-2019), exhibits no power when the key is turned, indicating a potential issue with the starting system.

Repair Time
1-4 hours depending on parts replacement.

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Always disconnect the battery before working on electrical systems to prevent shock.

Symptoms

  • •No sound or clicking noise when the ignition key is turned
  • •Dashboard lights and indicators remain off
  • •No engine cranking
  • •Battery warning light illuminated (if applicable)
  • •Possible faint electrical sounds from the engine compartment

Diagnostic Steps

  1. 1Verify battery condition by checking voltage with a multimeter; it should read at least 12.6 volts for a healthy battery.
  2. 2Inspect battery terminals for corrosion or loose connections; clean and tighten as necessary.
  3. 3Check the fuse related to the starter and ignition system using the vehicle's fuse box diagram.
  4. 4Test the ignition switch functionality to ensure it is sending power to the starter relay.
  5. 5Inspect the starter relay by swapping it with a similar one in the fuse box to check for functionality.
  6. 6If available, perform a continuity test on the starter motor using a multimeter.

Solution

Solution

1. Preparation

  • Tools Required: Multimeter, socket set, fuse puller, flathead screwdriver, torque wrench
  • Disconnect the negative battery terminal to prevent electrical shock or short circuits.

2. Battery Replacement (if necessary)

  • Sub-steps:
    1. Remove the negative terminal first, followed by the positive terminal.
    2. Unbolt and remove the battery from its tray.
    3. Position the new battery in the tray, ensuring correct polarity.
    4. Connect the positive terminal first, followed by the negative terminal.
    5. Secure the battery with the mounting bracket.

3. Starter Replacement (if necessary)

  • Sub-steps:
    1. Remove the battery to access the starter more easily.
    2. Disconnect the wiring harness from the starter motor.
    3. Unbolt the starter from its mounting position using the socket set.
    4. Install the new starter by reversing the removal steps, ensuring all connections are secure.
    5. Reconnect the battery and check for proper installation.

4. Ignition Switch Replacement (if necessary)

  • Sub-steps:
    1. Remove the steering column cover with a screwdriver.
    2. Disconnect the wiring harness connected to the ignition switch.
    3. Unbolt the ignition switch from its position.
    4. Install the new ignition switch and reconnect the wiring harness.
    5. Reattach the steering column cover.

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

  • Multimeter
  • Socket set
  • Fuse puller
  • Flathead screwdriver
  • Torque wrench

Parts Required

  • Replacement battery (if necessary)
  • Starter motor (if necessary)
  • Ignition switch (if necessary)

Additional Information

Repair Time

1-4 hours depending on parts replacement.

Difficulty

medium

Severity

medium

Tools

5 items

Parts

3 items

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