Inspection Procedure 12

Inspection Procedure 12: The comfort flashing function does not work normally.

TECHNICAL DESCRIPTION (COMMENT)

If the comfort flashing function does not work normally, the turn-signal light switch input circuit(s) and ETACS-ECU may have a problem.

TROUBLESHOOTING HINTS

- Malfunction of column switch
- Malfunction of the ETACS-ECU
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, Check the configuration function.





(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Use the ETACS-ECU configuration function to check that the "Comfort flasher" is set to "Enable".
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the "Comfort flasher" set to "Enable"?

YES Go to Step 2.

NO Use the ETACS-ECU customize function to set the "Comfort flasher" to "Enable" (Refer to Programming and Relearning).

STEP 2. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code.

(1)Turn the ignition switch to the "ON" position.

(2)Check whether the ETACS-ECU DTC is set.

(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the ETACS-ECU (Refer to ETACS, Diagnosis Electronic Time and Alarm Control System (ETACS)).
NO Go to Step 3.
STEP 3. Check that the turn-signal light operate.

Check that the turn-signal light work normally when the ignition switch is in the "ON" position.

Q. Do turn-signal lights work normally?

YES Go to Step 4.
NO Refer to Inspection Procedure 11 "None of turn-signal lights illuminates" Inspection Procedure 11.
STEP 4. Retest the system

Check that the comfort flashing function works normally.

Q. Does comfort flashing function works normally?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the ETACS-ECU.