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Inspection Procedure 13: The remote controlled mirror switch (fold switch) signal is not received.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
Input signal from the remote controlled mirror switch (fold switch) is used to operate the functions below. If the signal is abnormal, these functions will not work normally.
  • Electric-folding door mirrors
 
 
TROUBLESHOOTING HINTS
  • The remote controlled mirror switch may be defective
  • The ETACS-ECU may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check the remote controlled mirror switch.
Refer to GROUP 51 - Door Mirror .
Is the check result normal?
Go to Step 2.
Replace the remote controlled mirror switch.
 
STEP 2. Resistance measurement at remote controlled mirror switch connector (ground terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the remote controlled mirror switch connector (ground terminal) and body 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 ground line between remote controlled mirror switch connector and body ground.
Is the check result normal?
Intermittent malfunction is suspected (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 4. Check of short to power supply, short to ground, and open circuit in MRR line between ETACS-ECU connector and remote controlled mirror switch connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Using scan tool (M.U.T.-IIISE), check data list.
Check the ETACS-ECU data list.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect Scan Tool (M.U.T.-IIISE) ."
(2) Check the input signals from the remote controlled mirror switch (fold switch).
  • Operate the remote controlled mirror switch (fold switch).
 
Item No.Item nameNormal condition
91Mirror switchOFF to ON (only when switch is operated)
Item No.Item nameNormal condition
91Mirror switchOFF to ON (only when switch is operated)
OK: Normal condition is displayed.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.