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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



DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe

STEP 1. Check center panel unit connector C-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector.


Q. Is center panel unit connector C-18 in good condition?
Go to Step 2.
Repair or replace the damaged component(s) (Refer to GROUP 00E, 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.
Switch position
 Tester connection
 Specified condition
Released
 5 - switch body
 Open circuit
Pressed
 5 - switch body
 Continuity exists (2 ohms or less)

Q. Is the hazard warning light switch in good condition?
Go to Step 3.
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?
Go to Step 4.
Repair or replace the damaged component(s) (Refer to GROUP 00E, 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-18 (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-18 (terminal 5) and ETACS-ECU connector C-301 (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.