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The hazard warning lights do not illuminate.
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the hazard warning lights do not illuminate, the hazard warning light switch input circuit in center panel unit or the ETACS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The hazard warning light 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. Check that the turn-signal lights operate.
Check that the turn-signal lights illuminate normally.
Is the check result normal?
Go to Step 2.
Refer to inspection procedure B-1 "None of the turn-signal lights illuminate ."
 
STEP 2. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). 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 related 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 3.
 
STEP 3. Using scan tool (M.U.T.-III), check data list
Check the input signal from the hazard warning light switch.
  • Operate the hazard warning light switch.
 
Item No.Item nameNormal condition
26Hazard warning light switchOFF to ON (only when switch is operated)
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 4.
Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis .
 
STEP 4. Retest the system.
Check that the hazard warning 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.