Inspection Procedure 1: The daytime running lamps do not illuminate normally.


caution Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.










COMMENTS ON TROUBLE SYMPTOM


If the daytime running lamp function is not operating normally, the ETACS-ECU power circuit may be defective, daytime running lamp relay may be defective or the ETACS-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.
When the electric motor 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 2.

STEP 2. M.U.T.-III data list
Check the input signals below, which are related to the daytime running lamp function.

  • Turn the electric motor switch to the "ON" position.
Item No.
 Item name
 Normal condition
30
 IG SW (IG1) /Power SW(ON)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to inspection procedure 2 "The electric motor switch (IG1) signal is not received ."

STEP 3. Connector check: A-116X daytime running lamp relay connector, B-317 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Check the daytime running lamp relay

Q. Is the check result normal?
Go to Step 5
Replace the daytime running lamp relay.

STEP 5. Voltage measurement at the A-116X daytime running lamp relay connector
(1)Remove the daytime running lamp relay, and measure at the relay box side.
(2)Measure the voltage between terminal 1 and the body earth, and between terminal 4 and body earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Wiring harness check between the A-116X daytime running lamp relay connector terminal No. 1, 4 and the fusible link (2)

  • Check the output lines for open circuit.

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 ).
Repair the wiring harness.

STEP 7. Wiring harness check between the A-116X daytime running lamp relay connector terminal No. 2 and the B-317 ETACS-ECU connector terminal No. 73
note Before the wiring harness check, check the intermediate connector B-28, and then repair that if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. 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 ).




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