Description
LR031677 Blower Motor Resistor is a genuine Land Rover OEM part designed for multiple Range Rover models with automatic climate control systems. Here’s the detailed technical breakdown:
🔧 Core Specifications
✔ OEM Part Number: LR031677 (replaces LR015963)
✔ Electrical Ratings:
12V DC operation
30A max current capacity
PWM-controlled variable blower speeds
✔ Compatible Systems:Automatic dual-zone climate control
Front HVAC systems only
🚗 Precision Fitment Guide
• Land Rover Models:
Range Rover Sport (2005-2013) – All engines
LR3 (2005-2009)
LR4 (2010-2016)
Range Rover (L322) (2005-2012)
• Not Compatible With:Rear HVAC systems
2017+ models with smart blower modules
Defender or Discovery Sport models
⚠ Failure Symptoms
▸ Most Common Signs:
Blower fan only works on high speed
Intermittent fan operation
No airflow despite climate control settings
Burning plastic smell from HVAC system
Fault codes:
B1D64-11 (Blower Speed Circuit Short)
U0256-00 (Lost Communication with Front HVAC)
🔌 Installation Guide
Location:
Behind glove box (RH drive vehicles)
Behind center console (LH drive vehicles)
Accessible through passenger footwell
Replacement Steps:
Disconnect battery negative terminal
Remove 5.5mm screws (x3) securing resistor
Unplug 6-pin electrical connector
Clean thermal paste residue before installing new unit
Post-Installation:
Reset HVAC module (ignition cycle 3x)
Test all blower speeds (1-7)
Check for proper airflow at all vents
📜 Technical Service Bulletins
• LTB00562: Updated resistor design for 2007-09 models
• SSM 72730: Requires HVAC module reset after replacement
⚠ Critical Notes
• Always replace thermal paste (use Arctic Silver 5)
• Check blower motor current draw (should be 8-12A at max speed)
• 2013-16 models may require CJB software update
For proper diagnosis:
Verify fuse #33 (40A) in passenger compartment
Check blower motor operation with direct 12V test
Inspect resistor connector for melting (common issue)
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