Inspection Procedure 1
SYMPTOM PROCEDURESInspection Procedure 1: Ignition key cylinder illumination light does not illuminate/Extinguish Normally. [vehicles with WCM>
CAUTION: Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
Ignition Key Cylinder Illumination Light Circuit [Vehicles With WCM] (part 1):
Ignition Key Cylinder Illumination Light Circuit [Vehicles With WCM] (part 2):
OPERATION
The ETACS-ECU operates this function in accordance with the input signals below.
- Ignition switch (IG1)
- Key reminder switch
- Driver's door switch
- Driver's door lock actuator
TECHNICAL DESCRIPTION (COMMENT)
If this function does not work normally, these input signal circuit(s), the ignition key cylinder illumination light or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- The key reminder switch may be defective
- The driver's door switch may be defective
- The driver's door lock actuator may be defective
- The ignition key cylinder illumination light bulb may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
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 scan tool (M.U.T.-III)." 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.
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to the ignition key cylinder illumination light function.
- Turn the ignition switch to the "LOCK" (OFF) position.
- Remove the ignition key from the ignition key cylinder.
- Open the driver's door.
Q:Does scan tool MB991958 display the items "Dr door unlock", "Dr door ajar switch", and "Handle lock switch" as normal condition?
YES [Normal conditions are displayed for all the items.] : Go to Step 3.
2GNO [Normal condition is not displayed for item No.228.] : Troubleshoot the ETACS-ECU. Refer to Diagnosis - Inspection Procedure 4 "ETACS-ECU does not receive any signal from the front door lock actuator". Inspection Procedure 4
NO [Normal condition is not displayed for item No.254.] : Troubleshoot the ETACS-ECU. Refer to Diagnosis - Inspection Procedure 2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)". Inspection Procedure 2
NO [Normal condition is not displayed for item No.256.] : Troubleshoot the ETACS-ECU. Refer to Diagnosis - Inspection Procedure 6 "ETACS-ECU does not receive any signal from the front the front door switch (RH)". Inspection Procedure 6
NO [Normal condition is not displayed for item No. 264.] : Troubleshoot the ETACS-ECU. Refer to Diagnosis - Inspection Procedure 3 "ETACS-ECU does not receive any signal from key reminder switch". Inspection Procedure 3
NO [Normal condition is not displayed for item No.270, 271.] : Troubleshoot the ETACS-ECU. Refer to Diagnosis - Inspection Procedure 4 "ETACS-ECU does not receive any signal from front door lock actuator". Inspection Procedure 4
STEP 3. Check key reminder switch connector C-211, ETACS-ECU connector C-315 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is key reminder switch connector C-211, ETACS-ECU connector C-315 in good condition?
YES : Go to Step 4.
NO : Repair the damaged parts.
STEP 4.Check the wiring harness between key reminder switch connector C-211 (terminal No.3,5) and ETACS-ECU connector C-315 (terminal No.13,18).
- Check the input/output line for open circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the wiring harness between key reminder switch connector C-211 and ETACS-ECU connector C-315.
STEP 5. Check of ignition key cylinder illumination light bulb.
Q:Is the ignition key cylinder illumination light bulb in good condition?
YES : Go to Step 6.
NO : Replace the bulb of the ignition key cylinder illumination light.
STEP 6. Check the wiring harness between key reminder switch connector C-211 (terminal No.7) and body ground.
- Check the ground line for open circuit.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the wiring harness between key reminder switch connector C-211 and body ground.
STEP 7. Retest the system.
Q: Does the ignition key cylinder illumination light illuminate/extinguish in good condition?
YES : The trouble can be an intermittent malfunction.
NO : Replace the ETACS-ECU.