Blower motor circuit

The blower motor is operated by signals from the air conditioning amplifier. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

1. 1
   Perform active test by intelligent tester (blower motor)
2. 2
   Connect the intelligent tester to (with can vim) the dlc3.
3. 3
   Turn the ignition switch on and turn the intelligent tester main switch on.
4. 4
   Select the item below in the active test, and then check that the blower motor operates.

   

1. 1
   Inspect fuse (htr)
2. 2
   Remove the htr h-fuse from the engine room no. 2 Relay block.
3. 3
   Measure the resistance of the h-fuse.

Standard resistance: below 1

3. Check wire harness (blower motor - body ground)

1. 1
   Disconnect the e53 motor connector.
2. 2
   Measure the resistance of the wire harness side connector.

Standard resistance

4. Check wire harness (blower motor - battery)

1. 1
   Disconnect the e53 motor connector.
2. 2
   Measure the voltage of the wire harness side connector.

Standard voltage

5. Check blower w/ fan motor sub-assembly

1. 1
   Disconnect the e37 amplifier connector.
2. 2
   Connect the e53 motor connector.
3. 3
   Measure the voltage of the connector.

Standard voltage

6. Check wire harness (air conditioning amplifier - body ground)

1. 1
   Disconnect the e37 amplifier connector.
2. 2
   Measure the voltage of the wire harness side connector

Standard voltage

7. Check air conditioning amplifier

1. 1
   Remove the air conditioning amplifier with its connectors still connected.
2. 2
   Check the waveform of the amplifier connector.

The waveform varies with the blower level.