( TF09E8KG24113614602FAAT00 )
Blower Motor Circuit Troubleshooting

  1. Turn the ignition switch to ON (II) and the heater fan switch ON.
Does the blower motor run in each speed?
YES -
Go to Step 2 .
NO -
Go to Step 16 .
  1. Turn the heater fan switch OFF.
  1. Make sure the ignition switch is ON (II).
Does the blower motor run?
YES -
Go to Step 4 .
NO -
Go to Step 9 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the blower motor 2P connector.
  1. Disconnect the blower resistor 4P connector.
  1. Disconnect the heater fan switch 8P connector.
  1. Check for continuity between the heater fan switch 8P connector No. 2, 4, 7, and No. 8 terminals and body ground individually.
Is there continuity?
YES -
Repair short to body ground in the wires between the blower motor, the blower resistor and the heater fan switch.■
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the blower resistor 4P connector.
Is the blower resistor OK?
YES -
Go to Step 12 .
NO -
Replace the blower resistor.■
  1. Reconnect the blower resistor 4P connector.
  1. Disconnect the heater fan switch 8P connector.
  1. Turn the ignition switch to ON (II).

  1. Ground each of the heater fan switch 8P connector terminals individually in the following order: No. 4, 7, 8, and No. 2.
Does the blower motor run at progressively higher speeds?
YES -
NO -
Repair any open or cause of excessive resistance in the appropriate wires between the blower resistor and the heater fan switch.■
  1. Turn the heater fan switch OFF and the ignition switch to LOCK (0).
  1. Check the No. 57 (30 A) and the No. 10 (7.5 A) fuses in the under-dash fuse/relay box.
Are the fuses OK?
YES -
Go to Step 18 .
NO -
Replace the fuses, and recheck. If the fuses blow again, check for a short in the No. 57 (30 A) and No. 10 (7.5 A) fuses circuit.■
Is the relay OK?
YES -
Go to Step 19 .
NO -
Replace the blower motor relay .■

  1. Measure the voltage between the blower motor relay 4P socket No. 1 terminal and body ground.
Is there battery voltage?
YES -
Go to Step 20 .
NO -
Replace the under-dash fuse/relay box.■
  1. Turn the ignition switch to ON (II).

  1. Measure the voltage between the blower motor relay 4P socket No. 3 terminal and body ground.
Is there battery voltage?
YES -
Go to Step 22 .
NO -
Replace the under-dash fuse/relay box.■
  1. Turn the ignition switch to LOCK (0).

  1. Check for continuity between the blower motor relay 4P socket No. 4 terminal and body ground.
Is there continuity?
YES -
Go to Step 24 .
NO -
Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G501.

  1. Connect the blower motor 2P connector No. 2 terminal to body ground with a jumper wire.
  1. Turn the ignition switch to ON (II).
Does the blower motor run?
YES -
Go to Step 26 .
NO -
Go to Step 34 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the jumper wire.
  1. Disconnect the heater fan switch 8P connector.
Is the heater fan switch OK?
YES -
Go to Step 30 .
NO -

  1. Connect the heater fan switch 8P connector No. 2 terminal to body ground with a jumper wire.
  1. Turn the ignition switch to ON (II).
Does the blower motor run?
YES -
Go to Step 32 .
NO -
Repair open in the wire between the blower motor and the heater fan switch.■
  1. Turn the ignition switch to LOCK (0).

  1. Check for continuity between the heater fan switch 8P connector No. 1 terminal and body ground.
Is there continuity?
YES -
NO -
Check for an open in the wire between the heater fan switch and body ground. If the wire is OK, check for poor ground at G502.
  1. Disconnect the jumper wire.
  1. Disconnect the blower motor 2P connector.

  1. Measure the voltage between the blower motor 2P connector No. 1 terminal and body ground.
Is there battery voltage?
YES -
Replace the blower motor.■
NO -
Check for an open in the wire between the blower motor relay and blower motor.■