Inspection Procedure 10

Inspection Procedure 10: ETACS-ECU does not receive any signal from the hazard warning light switch.














TECHNICAL DESCRIPTION (COMMENT)

If there is an error to the hazard warning light switch input signal, the hazard warning light switch signal is no longer output to the communication line.

TROUBLESHOOTING HINTS

- The center panel unit 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 center panel unit connector C-124 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is center panel unit connector C-124 in good condition?

YES Go to Step 2.
NO Repair or replace the damaged component(s) Harness Connector Inspection). Check that the input signal of hazard warning light switch is normal.
STEP 2. Check the hazard warning light switch.

Remove the center panel unit. Then check continuity between the switch terminal and switch body.





Q. Is the hazard warning light switch in good condition?

YES Go to Step 3.
NO Replace the center panel unit. Check that the input signal of hazard warning light switch is normal.
STEP 3. Check ETACS-ECU connector C-301 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is ETACS-ECU connector C-301 in good condition?

YES Go to Step 4.
NO Repair or replace the damaged component(s) Harness Connector Inspection). Check that the input signal of hazard warning light switch is normal.
STEP 4. Check the wiring harness between center panel unit connector C-124 (terminal 5) and ETACS-ECU connector C-301 (terminal 19).

Check the input lines for open circuit and short circuit.

Q. Is the wiring harness between center panel unit connector C-124 (terminal 5) and ETACS-ECU connector C-301 (terminal 19) in good condition?

YES Replace the ETACS-ECU. Check that the input signal of hazard warning light switch is normal.
NO 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.