Inspection Procedure I-11
INSPECTION PROCEDURE I-11: Headlight and Taillight: Daytime running light function does not work normally.Daytime Running Light:
TECHNICAL DESCRIPTION (COMMENT)
If the daytime running light function does not work,connector(s), wiring harness in the CAN bus lines,the ECM
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 (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB Cable
- MB991910: MUT-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 I-2 "Headlights (low-beam) do not illuminate normally."
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.
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 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 (Refer to Information Bus, Diagnosis).
STEP 3. Using scan tool MB991958, read the ECM
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 ECM
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 (Refer to Diagnostic trouble code chart in Instrument Cluster/Carrier).
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."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. 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. Refer to Encrypted Code Registration Criteria Table in Antitheft and Alarm Systems. The ignition key reminder tone alarm function should now work normally.
NO: Refer to Parking brakes, troubleshooting.