Inspection Procedure 7: Daytime running lamp function does not work normally.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM
If the daytime running lamp function is not operating normally the ETACS-ECU power circuit may be defective or the ETACS-ECU may be defective.

PROBABLE CAUSES

  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check that the headlamps operate.
Do the low-beam headlamps illuminate when the lighting switch is turned to the HEAD position?

Q. Is the check result normal?
Go to Step 2.
First, repair the headlamps. Refer to Inspection Procedure 1 "None of the low-beam headlamps illuminate ."

STEP 2. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to diagnosis code chart .
Go to Step 3.

STEP 3. M.U.T.-III data list
Check the input signals below, which are related to the daytime running lamp function.

  • Turn the ignition switch to the "ON" position.
Item No.
 Item name
 Normal condition
30
 Ignition switch(IG1)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Refer to inspection procedure C-3 "The ignition switch (IG1) signal is not received ."

STEP 4. Retest the system.
Check that the daytime running lamp function works normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU and register the ID codes (Refer to ).