Inspection Procedure H-11

INSPECTION PROCEDURE H-11: Headlight and Taillight: Daytime running light function does not work normally.






TECHNICAL DESCRIPTION (COMMENT)

If the daytime running light function does not work, connector(s), wiring harness in the CAN bus lines, the powertrain control module, the combination meter, the ETACS-ECU or the input signal circuit may be defective.

TROUBLESHOOTING HINTS

- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Verify the headlight (low-beam) operation.

Check to see that the headlight (low-beam) lights up properly when operating the dimmer switch while the headlight switch is ON.

Q. Do the headlights (low-beam) illuminate normally?

YES Go to Step 2.
NO Refer to Inspection Procedure H-2 "Headlights (low-beam) do not illuminate normally Inspection Procedure H-2."
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.





(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 SWS monitor How to Connect SWS Monitor."
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

YES Go to Step 3.

NO Repair the CAN bus line CAN Bus Diagnostics Chart).

STEP 3. Using scan tool MB991958, read the MFI system diagnostic trouble code.





Check whether engine and transaxle DTCs are set or not.
(1)Turn the ignition switch to the "ON" position.
(2)Check for engine and transaxle DTCs.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the MFI system by referring to MFI Diagnosis - Diagnostic Trouble Code Chart Multiport Fuel Injection (MFI) or MFI Diagnosis - Diagnostic Trouble Code Chart Multiport Fuel Injection (MFI).

NO Go to Step 4.

STEP 4. Using scan tool MB991958, read the combination meter diagnostic trouble code.





Check whether the combination meter-related DTC is set.
(1)Turn the ignition switch to the "ON" position.
(2)Check whether the combination meter-related DTC is set.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the combination meter Combination Meter).

NO Go to Step 5.

STEP 5. Check the input signal (by using the pulse check mode of the monitor).





Check the input signals from the parking brake switch.

- Check that scan tool MB991958 sounds when the parking brake lever is pulled.
(1)Operate scan tool MB991958 according to the procedure below to display "Pulse check."

.....Select "Interactive Diagnosis."

.....Select "System Select."

.....Select "SWS."

.....Select "Pulse Checking."

Q. Does scan tool MB991958 sound when the parking brake lever is pulled?

YES Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Encrypted Code Registration Criteria Table.
The ignition key reminder tone alarm function should now work normally.

NO Symptom Chart.