This procedure covers the replacement of the blower motor control module (power transistor) located in the HVAC system on the passenger side of the 2018-2024 Honda Accord 1.5L Turbo.

Warnings

Tools required

Parts

• Blower Motor Control Module (Power Transistor) × 1 — Use OEM Honda specification

Preparation

1. Park vehicle on level surface and set parking brake
2. Turn ignition off and remove key from vehicle
3. Wait 3 minutes for electrical system to discharge
4. Open passenger door for access to lower dash area

Procedure

1. 1

   Remove passenger side lower dash panel
   Locate the lower dash panel on the passenger side footwell. Remove the Phillips screws securing the panel (typically 2-3 screws). Gently pull the panel away from the dash, releasing any retaining clips. Set the panel aside.
2. 2

   Locate the blower motor control module
   With the lower panel removed, look up toward the HVAC housing on the passenger side. The blower motor control module is mounted to the side of the HVAC unit near the blower motor. It has a wire harness connector attached and typically has cooling fins visible.
3. 3

   Disconnect the electrical connector
   Press the locking tab on the electrical connector attached to the blower motor control module and carefully pull the connector straight away from the module. Do not pull on the wires themselves.
4. 4

   Remove the control module mounting screws
   Using a Phillips screwdriver, remove the two screws securing the blower motor control module to the HVAC housing. Note the orientation of the module for reinstallation. Carefully pull the module away from the housing.
   ℹ️The module may have thermal paste or a gasket between it and the housing for heat transfer.
5. 5

   Inspect the mounting surface
   Inspect the mounting surface on the HVAC housing for debris, corrosion, or damage. Clean the surface with a clean, dry cloth if necessary. Check the condition of any thermal interface material.
6. 6

   Install the new control module
   Position the new blower motor control module in the same orientation as the old one. If the new module includes thermal paste or a gasket, ensure it is properly positioned. Install the mounting screws and tighten to specification using a torque wrench.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
7. 7

   Reconnect the electrical connector
   Push the electrical connector firmly onto the new blower motor control module until you hear or feel the locking tab click into place. Verify the connection is secure by gently tugging on the connector.
8. 8

   Test blower motor operation
   Before reinstalling the lower dash panel, turn the ignition to the ON position (engine does not need to start). Turn on the climate control system and test all blower motor speeds (low, medium-low, medium-high, and high). Verify smooth operation at all speeds without unusual noise or fluctuation.
   ⚠If the blower motor does not operate at all speeds, turn off the system immediately and recheck the connector and module installation.
9. 9

   Reinstall the lower dash panel
   Position the passenger side lower dash panel back into place. Align any retaining clips and press firmly to engage them. Install the Phillips screws and tighten to avoid rattles, but do not overtighten plastic fasteners.

Reassembly

1. Ensure all panels are securely fastened and aligned properly
2. Verify no tools or parts were left in the footwell area
3. Check that the electrical connector is fully seated and locked

Verification

• Start the engine and run the climate control system through all blower speed settings
• Verify smooth, consistent airflow at each speed with no hesitation or cutting out
• Listen for any abnormal noises from the blower motor or control module area
• Confirm proper temperature control function with the new module installed
• Check for any error codes using a scan tool if available

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