← View Generic B1139 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2018 BMW X5

B1139: B1139: Power Window Relay Circuit Malfunction

on 2018 BMW X5

Fix Cost
$100 - $300
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2018 BMW
X5
⚠️

Important for 2018 BMW X5 Owners

Before starting repairs, verify which engine your 2018 BMW X5 has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does B1139 Mean on 2018 BMW X5?

The power window relay circuit has malfunctioned, preventing the windows from functioning properly. This code is typically set when the window relay circuit is open or shorted.
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Symptoms

  • • Windows do not function
  • • may be stuck or slow to operate
  • • may have unusual noises or vibrations
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Common Causes

  • • Faulty power window relay
  • • wiring issues
  • • blown fuse
  • • faulty window switch
  • • or a malfunctioning window regulator
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How to Fix B1139 on 2018 BMW X5

Check the power window relay for signs of physical damage or corrosion Test the relay circuit with a multimeter to ensure continuity Replace the power window relay if faulty Inspect and clean the wiring harness for any signs of damage or corrosion Replace any blown fuses or faulty window switches Inspect and repair or replace the window regulator if damaged

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Parts for 2018 BMW X5

Power window relay Shop ↗ Wiring harness Shop ↗ Fuses Shop ↗ Window switch Shop ↗ Window regulator Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B1139

B1137 Sequential Code

B1137: Climate Control Actuator Malfunction

Medium
B1138 Sequential Code

B1138: Door Locks Actuator Circuit Malfunction

Medium
B1140 Sequential Code

B1140: Seat Position Sensor Malfunction

Medium
B1141 Sequential Code

B1141: Turn Signal or Hazard Warning Light Malfunction

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system