Inspection Procedure
8: Either of the door mirror heater elements does not work.
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COMMENTS ON TROUBLE SYMPTOM
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If one of the door mirror heater elements does not work, the power supply or earth to
the element, or the element itself may be defective.
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- Door mirror heater elements failed
- Wiring harness or connector failure
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STEP 1. Determine a trouble spot.
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Q.
Which of door mirror heater elements does not work?
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RH side door mirror : Go to Step 2.
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LH side door mirror : Go to Step 8.
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STEP 2. Check of the heater element of the door mirror (RH)
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Check the heater element of the door mirror (RH). (Refer to Heater Element Check  .)
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Q.
Is the check result normal?
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 Go to Step 3.
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 Replace the mirror glass of the door mirror assembly (RH).
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STEP 3. Measure the resistance at the door mirror assembly (RH) connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Resistance between door mirror assembly (RH) connector (earth terminal) and body
earth
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check of open circuit in earth line between the door mirror
assembly (RH) connector and body earth.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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STEP 5. Measure the voltage at the door mirror assembly (RH) connector.
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(1)Turn the ignition switch to the ON position.
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(2)Turn on the rear window defogger switch.
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(3)Disconnect the connector, and measure at the wiring harness side.
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(4)Measure the voltage between door mirror assembly (RH) connector (power supply terminal)
and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
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Go to Step 6.
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STEP 6. Check of open circuit in DEFO-1&DEFO-2 line between
door mirror assembly (RH) connector and ETACS-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(s) or wiring harness.
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STEP 7. Retest the system.
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Check that the heater element of the door mirror (RH) functions normally.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
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Replace the door mirror assembly (RH).
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STEP 8. Check of the heater element of the door mirror (LH)
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Check the heater element of the door mirror (LH). (Refer to Heater Element Check .)
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the mirror glass of the door mirror assembly (LH).
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STEP 9. Measure the resistance at the door mirror assembly (LH) connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between door mirror assembly (LH) connector (earth terminal)
and body earth.
OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 11.
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Go to Step 10.
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STEP 10. Check of open circuit in earth line between the door mirror
assembly (LH) connector and body earth.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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STEP 11. Measure the voltage at the door mirror assembly (LH) connector.
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(1)Turn the ignition switch to the ON position.
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(2)Turn on the rear window defogger switch.
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(3)Disconnect the connector, and measure at the wiring harness side.
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(4)Voltage between door mirror assembly (LH) connector (power supply terminal) and
body earth.
OK: System voltage
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
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Go to Step 12.
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STEP 12. Check of open circuit DEFO-1&DEFO-2 line between
door mirror assembly (LH) connector and ETACS-ECU connector.
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Q.
Is the check result normal?
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Go to Step 13.
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Repair the connector(s) or wiring harness.
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STEP 13. Retest the system.
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Check that the heater element works normally.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
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Replace the door mirror assembly (LH).
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