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Inspection Procedure A-1: None of turn-signal lights illuminates.
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If none of turn-signal lights illuminates, the ignition switch (IG1), the turn-signal light switch input circuit or the ETACS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of column switch
  • Malfunction of the ETACS-ECU
  • 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 MB991958, read the ETACS-ECU diagnostic trouble code.
(1)
cautionTo 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) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ETACS-ECU DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Diagnose the ETACS-ECU (Refer to ETACS, Diagnosis ).
Go to Step 2.
 
STEP 2. Using scan tool MB991958, check data list.
Using the ETACS-ECU service data, check the signals related to the illumination of turn-signal light.
  • Turn the ignition switch to the "ON" position.
 
Item No.Item nameNormal conditions
Item 254IG voltageBattery positive voltage
Does scan tool MB991958 display the item "IG voltage" as normal condition?
Go to Step 3.
Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis - Inspection Procedure 2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)" .
 
STEP 3. Retest the system.
Check that turn-signal lights illuminate.
Do turn-signal lights work 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.