Diagnostic Procedure
Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- STEP 1. Check the power supply system.
With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:
- Hazard warning lamp
Q: Is the check result normal?
- YES: Go to Step 2.
- NO: Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .
- STEP 2. Using scan tool MB991958, check data list.
Check the signals related to the power window timer function operation.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.- Connect scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ."
- Turn the ignition switch to the "ON" position.
- Check the data list of the ETACS.
- Turn the ignition switch to the "LOCK" (OFF) position.
OK: Normal condition is displayed.
Q: Is the check result normal?
- YES < Normal conditions are displayed for all the items. >: Go to Step 3.
- NO < Normal condition is not displayed for item No. 254. >: Refer to INSPECTION PROCEDURE 2: MALFUNCTION OF THE IGNITION SWITCH (IG1) INPUT/OUTPUT SIGNAL ."
- NO < Normal condition is not displayed for item No. 256. >: Refer to INSPECTION PROCEDURE 6: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (RH) ."
- NO < Normal condition is not displayed for item No. 257. >: Refer to INSPECTION PROCEDURE 5: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (LH) .
- STEP 3. Retest the system.
Check that the power window timer function works normally.
Q: Is the check result normal?
- YES: No action is necessary and testing is complete.
- NO: Replace the power window main switch. Check that the power window timer function works normally.