Inspection Procedure 10: ETACS-ECU Does Not Receive Any Signal From The Hazard Warning Light Switch: Diagnosis

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

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?
1. YES: Go to Step 2.
2. NO: Repair or replace the damaged component(s) (Refer to 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.

CONTINUITY SPECIFICATION

Switch position	Tester connection	Specified condition
Released	5 -switch body	Continuity exists (2 ohms or less)
Pressed	5 -switch body	Open circuit

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?
1. YES: Go to Step 4.
2. NO: Repair or replace the damaged component(s) (Refer to 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?
1. YES: Replace the ETACS-ECU. Check that the input signal of hazard warning light switch is normal.
2. 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.