INSPECTION PROCEDURE
1: Sunroof does not work at All.
| caution |
Before replacing the ECU,
ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
|
COMMENTS ON TROUBLE SYMPTOM
Malfunctions of the sunroof motor assembly power supply/earth system, sunroof
motor assembly, or sunroof switch are suspected.
PROBABLE CAUSES
- Malfunction of the sunroof motor assembly
- Malfunction of the sunroof switch
- Damaged wiring harness and connectors
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Check that any sunroof operation-related diagnosis codes are set in ETACS-ECU.
Q.
Is the diagnosis code set?
Refer to diagnosis code chart 
.
Go to Step 2.
STEP 2. Sunroof switch check
Refer to sunroof switch check .
Q.
Is the sunroof switch normal?
Go to Step 3.
Replace the sunroof switch.
STEP 3. Resistance measurement at sunroof switch connector (earth
line terminal).
|
|
(1)Disconnect the connector, and measure the resistance at the wiring harness-side
connector.
|
|
|
(2)Measure the resistance at the sunroof switch connector (earth line terminal) and
body earth.
OK: Continuity exists (2 Ω
or less)
|
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Check of short to earth, and open circuit in SW-
line
between sunroof motor assembly connector and sunroof switch connector.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 5. Resistance measurement at sunroof motor assembly connector
(E terminal).
|
|
(1)Disconnect the connector, and measure the resistance at the wiring harness-side
connector.
|
|
|
(2)Measure the resistance at the sunroof motor assembly connector (E terminal) and
body earth.
OK: Continuity exists (2 Ω
or less)
|
Q.
Is the check result normal?
Go to Step 7.
Go to Step 6.
STEP 6. Check of short to earth, and open circuit in E line between
sunroof motor assembly connector and body earth.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 7. Voltage measurement at sunroof motor assembly connector (SR+
terminal).
|
|
(1)Disconnect the connector, and measure the voltage at the wiring harness-side connector.
|
|
|
(2)Measure the voltage at the sunroof motor assembly connector (SR+
terminal)
and body earth.
|
Q.
Is the check result normal?
Go to Step 9.
Go to Step 8.
STEP 8. Check of short to power supply, short to earth, and open circuit
in SR+
line between sunroof motor assembly connector and fusible link.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 9. Voltage measurement at sunroof motor assembly connector (IG1
terminal).
|
|
(1)Disconnect the connector, and measure the voltage at the wiring harness-side connector.
|
|
|
(2)Turn the ignition switch ON position.
|
|
|
(3)Measure the voltage at the sunroof motor assembly connector (IG1 terminal) and
body earth.
|
Q.
Is the check result normal?
Go to Step 11.
Go to Step 10.
STEP 10. Check of short to power supply, short to earth, and open
circuit in IG1 line between sunroof motor assembly connector and fusible link.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
STEP 11. Retest the system.
Check that the sunroof works normally.
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunction ).
Replace the sunroof motor assembly.