Inspection Procedure 16: Rear air outlet vent cannot be changed
<Dual A/C>
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COMMENTS ON TROUBLE SYMPTOM
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When the rear outlet switching cannot be made,
the circuit between the rear mode selection damper control motor and
A/C-ECU may have a failure.
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- Malfunction of the rear mode selection damper control motor.
- Malfunction of the automatic A/C control panel
(A/C-ECU)
- Damaged the wiring harness or connectors
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STEP 1. Connector check: E-34-3 rear mode selection damper control
motor connector
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Q.
Is the check result normal?
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Go to Step 2.
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Repair
the connector.
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STEP 2. Voltage measurement at E-34-3 rear mode selection damper
control motor 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 position.
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(3)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 4.
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Go to Step 3.
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STEP 3. Check the wiring harness between E-34-3 rear mode selection
damper control motor connector terminal No.2 and the ignition switch
(IG2).
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note |
Prior to the wiring harness inspection, check
junction block connector D-401, D-403, intermediate connector D-220 and
rear blower assembly connector E-34, and repair if necessary.
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- Check the rear mode selection damper control motor 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 4. Resistance measurement at the E-34-3 rear mode selection damper
control 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 ohms)
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check the wiring harness between E-34-3 rear mode selection
damper control motor connector terminal No.1 and body earth.
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note |
Prior to the wiring harness inspection, check rear
blower assembly connector E-34, and repair if necessary.
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- Check the mode selection damper control motor earth 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 6. Connector check: D-07 A/C-ECU connector
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Q.
Is the check result normal?
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Go to Step 7.
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Repair
the connector.
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STEP 7. Check the wiring harness between E-34-3 rear mode selection
damper control motor connector (terminal 2, 1 and 5) and D-07
A/C-ECU connector (terminal 50, 49 and 48).
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note |
Prior to the wiring harness inspection, check rear
blower assembly connector E-34 and intermediate connector D-219, and
repair if necessary.
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- Check the A/C-ECU input line for open circuit.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the wiring harness.
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STEP 8. Replace the rear mode selection damper control motor and
recheck the trouble symptom
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Check that the rear mode selection damper
control motor operates normally.
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Q.
Is the check result normal?
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This
diagnosis is complete.
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Replace the A/C-ECU.
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