Inspection Procedure 1: The daytime running lights do not illuminate normally: Diagnosis

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Using scan tool MB991958, read the diagnostic trouble code.
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.
1. Connect scan tool MB991958. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .)
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU. (Refer to ETACS, DIAGNOSIS .)

NO : Go to Step 2.
STEP 2. Check that the tail/stoplights and headlights operate.
Check that the tail/stoplights and headlights illuminate normally.

Q: Do the tail/stoplights and headlights operate normally?

YES : Go to Step 3.

NO : Check the tail/stoplights and the headlights (Refer to TROUBLE SYMPTOM CHART ).
STEP 3. Using scan tool MB991958, read the other system diagnostic trouble code.
Check if DTC is set in the ETACS-ECU.
1. Turn the ignition switch to the "ON" position.
2. Check whether the ETACS-ECU related DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Troubleshoot the ETACS-ECU (Refer to ETACS, DIAGNOSIS ).

NO : Go to Step 4.

STEP 4. Using scan tool MB991958, check data list

Use the ETACS-ECU data list to check the signals related to the front dome light.

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

Item No.	Item name	Normal condition
254	IG voltage	1 V or less

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : Go to Step 5.

NO : Troubleshoot the ETACS-ECU. (Refer to INSPECTION PROCEDURE 2 "THE IGNITION SWITCH (IG1) SIGNAL IS NOT RECEIVED " .)

STEP 5. Check position and daytime running light assembly (DRL: LH) connector A-76 or daytime running light assembly (DRL: RH) connector A-77 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is position and daytime running light assembly (DRL: LH) connector A-76 or daytime running light assembly (DRL: RH) connector A-77 in good condition?

YES : Go to Step 6.

NO : Repair or replace the damaged component(s). (Refer to HARNESS CONNECTOR INSPECTION .)
STEP 6. Check the ground circuit to the position and daytime running light assembly (DRL: LH) or (DRL: RH). Measure the resistance at position and daytime running light assembly (DRL: LH) connector A-76 or position and daytime running light assembly (DRL: RH) connector A-77.
1. Disconnect the connector, and measure at the wiring harness side.
2. Check the resistance between the daytime running light connector and ground.
- Resistance between position and daytime running light assembly (DRL: LH) connector A-76 or daytime running light assembly (DRL: RH) connector A-77 terminal 3 and ground
  OK: The measured value should be continuity exists (2 ohms or less).
Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 8.

NO : Go to Step 7.

Fig 1: Checking Resistance Between Daytime Running Light Connector And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 7. Check the wiring harness between position and daytime running light assembly (DRL: LH) connector A-76 (terminal 3) or position and daytime running light assembly (DRL: RH) connector A-77 (terminal 3) and ground.
- Check the ground wires for open circuit.
NOTE: Also check intermediate connector A-52 and C-15 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-52 and C-15 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between position and daytime running light assembly (DRL: LH) connector A-76 (terminal 3) or position and daytime running light assembly (DRL: RH) connector A-77 (terminal 3) and ground in good condition?

YES : Go to Step 8.

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.
STEP 8. Check daytime running light relay connector A-27X for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is daytime running light relay connector A-27X in good condition?

YES : Go to Step 9.

NO : Repair or replace the damaged component(s). (Refer to HARNESS CONNECTOR INSPECTION .)
STEP 9. Check the daytime running light relay.
(Refer to REMOVAL SERVICE POINT .)

Q: Is the daytime running light relay in good condition?

YES : Go to Step 10.

NO : Replace the daytime running light relay.
STEP 10. Check the battery power supply circuit to the daytime running light relay. Measure the voltage at daytime running light relay connector A-27X.
CAUTION: The top and bottom of the daytime running light relay are difficult to identify. Prior to inspection, confirm the triangle mark on the relay box.
1. Disconnect daytime running light relay connector A-27X and measure the voltage available at the relay box side of the connector.
2. Measure the voltage between terminal 1 and ground, and between terminal 4 and ground.
- The voltage should measure approximately 12 volts (battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

YES : Go to Step 12.

NO : Go to Step 11.

Fig 2: Measuring Voltage Between Connector A-27X Terminal 1 And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 11. Check the wiring harness between daytime running light relay connector A-27X (terminal 1 and 4) and fusible link (36).
- Check the power supply line for open circuit.
Q: Is the wiring harness between daytime running light relay connector A-27X (terminal 1 and 4) and fusible link (36) in good condition?

YES : Go to Step 15.

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.
STEP 12. Check ETACS-ECU connector C-410 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-410 in good condition?

YES : Go to Step 13.

NO : Repair or replace the damaged component(s). (Refer to HARNESS CONNECTOR INSPECTION .)
STEP 13. Check the wiring harness between daytime running light relay connector A-27X (terminal 2) and ETACS-ECU connector C-410 (terminal 10).
Q: Is the wiring harness between daytime running light relay connector A-27X (terminal 2) and ETACS-ECU connector C-410 (terminal 10) in good condition?

YES : Go to Step 14.

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.
STEP 14. Check the wiring harness between daytime running light relay connector A-27X (terminal 3) and position and daytime running light assembly (DRL: LH) connector A-76 (terminal 2) or position and daytime running light assembly (DRL: RH) connector A-77 (terminal 2).
NOTE: Also check intermediate connector A-52 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-52 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
- Check the power supply line for open circuit.
Q: Is the wiring harness between daytime running light relay connector A-27X (terminal 3) and position and daytime running light assembly (DRL: LH) connector A-76 (terminal 2) or position and daytime running light assembly (DRL: RH) connector A-77 (terminal 2) in good condition?

YES : Go to Step 15.

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.
STEP 15. Retest the system.
Q: Does the daytime running lights illuminate in good condition?

YES : The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).

NO : Replace the ETACS-ECU.