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INSPECTION PROCEDURE 3: Electric-folding door mirror timer function does not work normally.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the door mirrors can be operated by using the electric remote controlled mirror switch (folding/unfolding switch), the ETACS-ECU may be faulty.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of ETACS-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Check the operation of the electric-folding door mirror.
Check that the electric folding door mirrors can work normally with the ignition switch at ACC.
  • Ignition switch: ACC
Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "Electric-folding door mirrors do not work at all ."
 
STEP 2. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.
Check if an ETACS-related diagnosis trouble code is set.
Is the diagnostic trouble code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A ETACS, "Diagnostic trouble code chart" ).
Go to Step 3.
 
STEP 3. Check the input signals which are related to the electric folding door mirror timer function.
  • Ignition switch: IG1
 
Item No.Item nameNormal conditions
Item 254 IG voltageBattery positive voltage
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 4.
Refer to GROUP 54A - ETACS, Inspection procedure 2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)." .
 
STEP 4. Retest the system.
Check that the electric-folding door mirror timer function works normally.
Is the check result normal?
Intermittent malfunction (Refer to the basic Service Manual, GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
Replace ETACS-ECU.