Mazda MX-3 silhouetteMX-3

TROUBLESHOOTING

G-27wiring diagram

Flowchart No. 8 is for the logic-type heater control unit. The (G) label appears on the actuator side and (V) on the control unit side at the rightmost terminal in the schematic.

Continued from G-26

Step 5

  1. 1
    Verify that the jumper wire is connected and the ignition switch is at ON.
  2. 2
    Measure the voltage at the following terminal wires of the condenser fan relay No.3 connector.
    B+: Battery positive voltage
    Condenser fan relay No.2 and No.3 location in the engine bay with a voltmeter connected. Terminal wires (L/G), (GY), (B), (R/Y), (R/Y) labeled on the connectors.

Wire / Voltage / Action (Step 5)

(GY)
VoltageB+
ActionMeasure voltage at (R/Y) wire
(GY)
VoltageOther
ActionRepair wiring harness (REAR WIPER 10A fuse—Condenser fan relay No.3)
(R/Y)
Voltage0V
ActionMeasure voltage at (L/G) wire
(R/Y)
VoltageOther
ActionRepair wiring harness (Condenser fan high relay—Condenser fan relay No.3)
(L/G)
Voltage0V
ActionRepair wiring harness (Condenser fan—Condenser fan relay No.3)
(L/G)
VoltageOther
ActionMeasure voltage at (B) wire
(B)
Voltage0V
ActionReplace condenser fan relay No.3
(B)
VoltageOther
ActionRepair wiring harness (Condenser fan relay No.3—GND)

Flowchart No. 8

8
DetailSymptom: Airflow mode does not change (logic type)
8
DetailRelated components: Mode door assembly, airflow mode actuator, heater control unit, wiring harness
Airflow mode actuator circuit (logic type)
Components (2)
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M)Heater control unit
Connections (9)
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M)
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):VENTHeater control unit:L/WBlue with White stripe
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):B/L-1Heater control unit:L/BBlue with Black stripe
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):B/L-2Heater control unit:OOrange
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):HEAT-1Heater control unit:G/OGreen with Orange stripe
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):HEAT/DEF-1Heater control unit:Y/RYellow with Red stripe
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):HEAT/DEF-2Heater control unit:LGLight Green
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):DEFHeater control unit:BR/YBrown with Yellow stripe
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):M1Heater control unit:YYellow
Airflow mode actuator (VENT, B/L, HEAT, HEAT/DEF, DEF positions, motor M):M2Heater control unit:VViolet
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