Mazda MX-3 silhouetteMX-3

FLOWCHARTS — Flowchart No. 1 (continued): Steps 2–5

G-13flowchart

TROUBLESHOOTING

Step 2

Check the REAR WIPER 10A fuse in the fuse block.

Step 2 — Check REAR WIPER 10A fuse

1
REAR WIPER 10A fuse condition?
Burnt
Replace fuse after checking and repairing wiring harness
OK
2
Go to Step 3

Step 3

  1. 1
    Turn the ignition switch to ON.
  2. 2
    Set the fan switch to the fourth position.
  3. 3
    Measure the voltage at the following terminal wires of the blower relay connector.
    B+: Battery positive voltage
    Measuring voltage at the blower relay connector with a voltmeter. Connector terminal layout shows wires (L/W), (GY), (L), (B).

Step 3 — Blower relay connector voltage

(GY)
VoltageB+
ActionMeasure voltage at (L/W) wire
(GY)
VoltageOther
ActionRepair wiring harness (REAR WIPER 10A fuse—Blower relay)
(L/W)
VoltageB+
ActionMeasure voltage at (B) wire
(L/W)
VoltageOther
ActionRepair wiring harness (Circuit breaker—Blower relay)
(B)
VoltageB+
ActionRepair wiring harness (Blower relay—GND)
(B)
VoltageOther
ActionMeasure voltage at (L) wire
(L)
VoltageB+
ActionGo to Step 4
(L)
VoltageOther
ActionReplace blower relay (Refer to page G-42)

Step 4

  1. 1
    Verify that the ignition switch is at ON and that the fan switch is in the fourth position.
  2. 2
    Measure the voltage at the following terminal wires of the blower motor connector.
    B+: Battery positive voltage
    Measuring voltage at the blower motor connector with a voltmeter. Connector terminal layout shows wires (L) and (L/W).

Step 4 — Blower motor connector voltage

(L)
VoltageB+
ActionMeasure voltage at (L/W) wire
(L)
VoltageOther
ActionRepair wiring harness (Blower relay—Blower motor)
(L/W)
Voltage0V
ActionReplace blower motor (Refer to page G-41)
(L/W)
VoltageOther
ActionGo to Step 5

Step 5

Measure the voltage at the (L/W) terminal wire of the resistor connector.

Step 5 — Resistor connector voltage

0V
ActionRepair wiring harness (Blower motor—Resistor)
Other
ActionGo to Step 6

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