Mazda MX-3 silhouetteMX-3

TROUBLESHOOTING - Flowchart No. 9: Airflow mode does not change (wire type)

G-29flowchart

Step 4

  1. 1
    Verify that the ignition switch is at OFF.
  2. 2
    Disconnect the heater control unit connector.
  3. 3
    Check for continuity between the terminal wires of the airflow mode actuator and heater control unit connectors.
    Two connector terminal layout diagrams. Top: AIRFLOW MODE ACTUATOR CONNECTOR with top-row terminals labeled (L/W), (L/B), (G/O) and bottom-row terminals (Y), (G), (O), (BR/Y), (LG), (Y/R). Bottom: HEATER CONTROL UNIT CONNECTOR with top-row terminals (O), (G/O), (Y/R), (LG) and bottom-row terminals (L/B), (L/W), (BR/Y), (V), (Y).

Step 4 - Continuity check

(L/W) (L/B) (O) (G/O) (Y/R) (LG) (BR/Y) (Y) (G)-(V)
ContinuityYes (all)
ActionCheck heater control unit (Refer to page G-46)
(L/W) (L/B) (O) (G/O) (Y/R) (LG) (BR/Y) (Y) (G)-(V)
ContinuityNo (portion)
ActionRepair faulty wiring harness

Flowchart No. 9

Flowchart No.
Value9
Symptom
ValueAirflow mode does not change (wire type)
Related components
ValueAirflow mode wire, mode door assembly, mode lever

Step 1

  1. 1
    Verify that the airflow mode wire is secured to the mode door link and that the outer tube is secured by the clip.
    Line illustration of the heater/airflow mode mechanism under the dash. Callout leaders point to CLIP, OUTER TUBE, AIRFLOW MODE WIRE, and MODE DOOR LINK.

Step 1

Secured
ActionGo to Step 2
Not secured
ActionConnect airflow mode wire and/or outer tube (Refer to page G-47)

Step 2

  1. 1
    Turn the ignition switch to ON and set the fan switch to the fourth position.
  2. 2
    Move the mode lever from VENT to DEF and verify that the mode door link operates and the air outlets change.

Step 2

Mode door link does not operate
ActionCheck connection between mode door and airflow mode wire (Refer to page G-47)
Lever sticks, air outlets change
ActionCheck wire routing from mode door to mode door link. Check lubrication of lever (Refer to page G-47)
Air outlets do not change; mode door link operates
ActionCheck mode door for damage (Refer to page G-38)
Air outlets and lever indication do not match
ActionAdjust outer tube and mounting (Refer to page G-47)

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