STEP 1. Using scan tool (M.U.T.-IIISE), read the ETACS-ECU diagnostic trouble code
STEP 2. Resistance measurement at the sunroof motor assembly connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the sunroof motor assembly connector (E terminal) and the ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. Check of open circuit in E line between sunroof motor assembly connector and ground.
STEP 4. Voltage measurement at the sunroof motor assembly connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the sunroof motor assembly connector (SR+ terminal) and the ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check short to ground, and open circuit in SR+ line between ETACS-ECU connector and sunroof motor assembly connector.
STEP 6. Check of open circuit in LIN2 line between ETACS-ECU connector and sunroof motor assembly connector.
STEP 7. Recheck the DTC.
Check again if the DTC is set in the ETACS-ECU.(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the electric motor switch to the OFF before connecting or disconnecting scan tool (M.U.T.-IIISE). |
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE)
."
(2) Erase the DTC.
(3) Turn the power supply mode of the electric motor switch from OFF to ON.
(4) Check if the DTC is set.
Is DTC set?
Replace the sunroof motor assembly. A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the sunroof motor assembly and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).