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Inspection Procedure 11: None of the turn-signal lights illuminate.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If all the turn-signal lights do not illuminate, the electric motor switch (IG1), the turn-signal light switch input circuit or the ETACS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The column 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
STEP 1. Using scan. tool (M.U.T.-IIISE), read the DTC
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch 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) Press the electric motor switch to turn on the power supply mode.
(3) Check whether the ETACS-ECU related DTC is set.
(4) Press the electric motor switch to turn off the power supply mode.
Is the DTC set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check data list.
Using the ETACS-ECU service data, check the signals related to the illumination of turn-signal light.
  • Press the electric motor switch to turn on the power supply mode.
  • Turn the turn-signal light switch to the left position.
 
Item No.Item nameNormal condition
254IG voltageBattery positive voltage
343Turn switch leftON
  • Turn the turn-signal light switch to the right position.
 
Item No.Item nameNormal condition
344Turn switch rightON
OK: Normal conditions are displayed for all the items.
Is the check result normal?
: Go to Step 3.
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The OSS-ECU (IG1) signal is not received ."
: Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 10 "The column switch signal is not received ."
 
STEP 3. Retest the system.
Check that the turn-signal lights illuminate.
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.