Inspection Procedure 13: Rear blower does not work <Dual
A/C>
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CIRCUIT OPERATION
If the rear blower motor does not operate, the
rear blower motor circuit system may be defective.
PROBABLE CAUSES
- Malfunction of the A/C-ECU
- Malfunction of the rear blower relay
- Malfunction of the rear A/C switch
- Damaged the wiring harness or connectors
- Malfunction of the rear blower motor
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STEP 1. Check that the blower motor operates when the blower switch is
moved to the "3 (HI) " position.
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(1)Turn the ignition switch to the "ON" position.
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(2)Turn the rear blower switch to the "3 (HI) "
position.
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Q.
Does the blower motor operate when the blower switch is moved to the
"3 (HI) " position?
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Refer
to Inspection procedure 11 "Air volume of rear blower cannot be changed
<dual A/C> ."
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Go to Step 2.
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STEP 2. Connector check: D-07 A/C-ECU connector and E-34-1 rear
blower motor connector
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Q.
Is the check result normal?
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Go to Step 3.
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Repair
the connector.
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STEP 3. Voltage measurement at E-34-1 rear blower motor connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Disconnect A/C-ECU connector D-07 and earth terminal
44.
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(4)Measure the voltage between terminal 2 and body
earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 4.
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STEP 4. Connector check: D-411 rear blower relay connector
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the connector.
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STEP 5. Check the rear blower relay continuity.
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Refer to .
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Q.
Is the rear blower relay in good condition?
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Go to Step 6.
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Replace the rear blower
relay.
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STEP 6. Voltage measurement at D-411 rear blower relay
connector.
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(1)Remove the relay, and measure at the junction block
side.
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(2)Measure the voltage between terminal 4 and body
earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check the wiring harness between D-411 rear blower relay
connector terminal No.4 and the fusible link (2).
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note |
Prior to the wiring harness inspection, check
intermediate connectors D-238, and junction block connector D-402, and
repair if necessary.
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- Check the rear blower relay power supply line for open or short
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 8. Voltage measurement at D-411 rear blower relay
connector.
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(1)Remove the relay, and measure at the junction block
side.
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(2)Turn the ignition switch to the "ON" earth
position.
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(3)Voltage between terminal 3 and body
earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Check the wiring harness between D-411 rear blower relay
connector No.3 and ignition switch (IG2).
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note |
Prior to the wiring harness inspection, check
junction block connectors D-403, D-401 and D-402, and repair if
necessary.
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- Check the rear blower relay power supply line for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 10. Check the wiring harness between D-411 rear blower relay
connector No.2 and D-07 A/C-ECU connector No.44.
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note |
Prior to the wiring harness inspection, check
junction block connector D-402, and repair if necessary.
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- Check the rear blower relay power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 11. Check the wiring harness between D-411 rear blower relay
connector No.4 and E-34-1 rear blower motor connector No.1.
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note |
Prior to the wiring harness inspection, check
junction block connector D-402, intermediate connector D-222 and rear
heater unit connector E-34, and repair if necessary.
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- Check the rear blower relay line for open or short circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 12. Resistance measurement at E-34-1 rear blower motor
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the rear blower switch to the "3 (HI) "
position.
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(3)Continuity between terminal 1 and body
earth. OK: Continuity (Less than 2 Ω)
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Q.
Is the check result normal?
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Go to Step 18.
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Go to Step 13.
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STEP 13. Connector check: E-25 rear A/C switch connector
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Q.
Is the check result normal?
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Go to Step 14.
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Repair
the connector.
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STEP 14. Check the rear A/C switch continuity.
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Refer to .
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Q.
Is the rear blower relay in good condition?
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Go to Step 15.
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Replace the rear blower
relay.
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STEP 15. Resistance measurement at E-25 rear blower motor
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between terminal 1 and body
earth. OK: Continuity (Less than 2 Ω)
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(3)Continuity between terminal 2 and body
earth. OK: Continuity (Less than 2 Ω)
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Q.
Is the check result normal?
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Go to Step 17.
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Go to Step 16.
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STEP 16. Check the wiring harness between E-25 rear A/C switch
connector (terminals 1 and 2) and earth.
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- Check the rear A/C switch earth line for open or short
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
or replace the wiring harness.
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STEP 17. Check the wiring harness between E-34-1 rear blower motor
connector No.1 and E-25 rear A/C switch connector No.7.
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note |
Prior to the wiring harness inspection, check rear
heater unit connector E-34, and repair if necessary.
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- Check the rear blower relay line for open or short circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 18. Check the rear blower motor.
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Refer to .
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Q.
Is the rear blower motor in good condition?
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Go to Step 19.
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Replace the rear blower
motor.
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STEP 19. Check the wiring harness between D-07 A/C-ECU connector No.45
and E-25 rear A/C switch connector No.8.
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note |
Prior to the wiring harness inspection, check
intermediate connector D-219, and repair if necessary.
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- Check the rear blower relay line for open or short circuit.
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Q.
Is the check result normal?
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Replace the A/C-ECU.
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Repair
the wiring harness.
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