This procedure covers the removal and replacement of the blower motor control module on a 2023 Rivian EDV 500, which regulates HVAC fan speed and operation.

Warnings

Tools required

Parts

• Blower motor control module × 1 — Use OEM specification
• Push pin retainers × 4 — Use OEM specification
• Dielectric grease × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Power off vehicle completely and remove key fob from cabin
3. Open front hood and disconnect 12V auxiliary battery negative terminal
4. Wait minimum 10 minutes for system capacitors to discharge
5. Remove floor mats and protect driver side footwell area with clean shop towels

Procedure

1. 1

   Remove driver side lower dash panel
   Using plastic trim removal tools, carefully pry out the lower dash panel below the steering column. Start at the bottom edge and work around the perimeter. There are typically 6 push pin retainers holding this panel. Pull panel downward and away to clear upper clips.
2. 2

   Access HVAC ducting
   Locate the HVAC duct assembly on the left side of the center console footwell area. Remove two 7mm screws securing the duct panel access cover. Gently pull the duct cover forward to expose the blower motor housing and control module mounting location.
3. 3

   Disconnect blower motor electrical connector
   Identify the blower motor main power connector attached to the motor assembly. Press the locking tab and pull connector straight back to disconnect. Note the routing of the wire harness for reinstallation.
4. 4

   Locate blower motor control module
   The control module is mounted directly on the blower motor housing or on a bracket adjacent to it. It is a rectangular electronic module approximately 3x4 inches with a multi-pin connector. Verify you have identified the correct component before proceeding.
5. 5

   Disconnect control module connector
   Press the connector locking tab on the control module harness and carefully pull connector straight back. Do not twist or rock connector as this may damage pins. If connector is difficult to remove, check for secondary locking tab or safety clip.
6. 6

   Remove control module mounting fasteners
   Remove the Torx T20 screws securing the control module to its mounting bracket (typically 2-3 screws). Support the module with one hand while removing final fastener to prevent it from falling into the dash cavity.
7. 7

   Extract control module
   Carefully maneuver the control module out of its mounting location. There may be limited clearance requiring angling of the module. Take note of the orientation and any grounding straps or brackets attached to the module for proper reinstallation.
8. 8

   Inspect mounting area and connector
   Examine the connector terminals for corrosion, burn marks, or bent pins. Check the mounting bracket for damage. Clean the mounting surface with electrical contact cleaner if any debris or moisture is present. Inspect rubber seal or gasket if equipped.
9. 9

   Install new control module
   Position the new control module in the mounting location in the same orientation as the original. Ensure any grounding straps are properly positioned. Start all mounting screws by hand before tightening to avoid cross-threading.
10. 10

    Secure control module
    Tighten all Torx T20 mounting screws evenly. Do not overtighten as the module housing is plastic and can crack. Ensure module sits flush against mounting surface and does not vibrate when gently shaken.
11. 11

    Reconnect electrical connectors
    Apply a small amount of dielectric grease to connector terminals. Connect the control module harness connector firmly until locking tab clicks into place. Reconnect blower motor main power connector in same manner. Gently tug on connectors to verify they are fully seated.
12. 12

    Reinstall HVAC ducting and access panels
    Replace the HVAC duct cover and secure with the two 7mm screws. Route any displaced wiring back to original position and secure with existing clips. Ensure no wires are pinched or stressed.
13. 13

    Reinstall lower dash panel
    Position lower dash panel and align upper clips first. Press firmly around perimeter to engage all push pin retainers. Replace any broken retainers with new ones. Verify panel is secure and gaps are even.
14. 14

    Reconnect battery and initialize system
    Reconnect 12V auxiliary battery negative terminal. Power on vehicle and allow HVAC system to initialize. This may take 30-60 seconds. Do not attempt to operate blower until initialization is complete.

Reassembly

1. Ensure all electrical connectors are fully seated with locking tabs engaged
2. Verify all trim panels are properly secured with no rattles or loose fasteners
3. Confirm no tools or parts were left in the dash cavity
4. Replace any damaged push pins or retainers with new OEM parts

Verification

• Turn ignition on and set HVAC system to maximum fan speed - verify blower operates smoothly without unusual noise
• Test all fan speed settings from lowest to highest to confirm proper control module operation
• Check for HVAC system fault codes using vehicle diagnostics - clear any stored codes from module replacement
• Verify airflow changes proportionally with fan speed adjustment
• Test climate control in AUTO mode to ensure module responds correctly to system commands
• Listen for any abnormal clicking or buzzing from the control module location during operation

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