← View Generic B2979 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2018 BMW X5
B2979: B2979: 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
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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 B2979 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 regulator motor or the window switch is faulty.
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Symptoms
- • Windows won't roll up or down
- • or do so intermittently
- • with no warning lights on the dashboard.
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Common Causes
- • Faulty power window relay
- • window regulator motor
- • window switch
- • or wiring issues.
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How to Fix B2979 on 2018 BMW X5
1. Check the power window relay and replace it if faulty. 2. Inspect the window regulator motor and replace it if necessary. 3. Test the window switch and replace it if faulty. 4. Check the wiring and repair any damage.
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Need Maintenance Info for Your X5?
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Related Diagnostic Codes
Other codes that may appear with B2979
B2977
Sequential Code
B2977: Climate Control Fan Motor Malfunction
Medium
B2978
Sequential Code
B2978: Door Locks Actuator Malfunction
Medium
B2980
Sequential Code
B2980: Seat Position Sensor Circuit Malfunction
Medium
B2981
Sequential Code
B2981: Exterior Lighting 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