STEP 1. Check hazard indicator assembly connector C-246 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
STEP 2. Check the hazard warning light switch.
STEP 3. Check the ground circuit to the hazard indicator assembly. Measure the resistance at hazard indicator assembly connector C-246.
STEP 4. Check the wiring harness between hazard indicator assembly connector C-246 (terminal 1) and grounding connector C-01 (terminal 11).
STEP 5. Check ETACS-ECU connector C-411 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
STEP 6. Check the wiring harness between hazard indicator assembly connector C-246 (terminal 6) and ETACS-ECU connector C-411 (terminal 19).
Check the input lines for open circuit and short circuit.Is the wiring harness between hazard indicator assembly connector C-246 (terminal 6) and ETACS-ECU connector C-411 (terminal 19) in good condition?
Replace the ETACS-ECU. Check that the input signal of hazard warning light switch is normal. The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the input signal of hazard warning light switch is normal.