STANDARD FLOW OF DIAGNOSTIC TROUBLE SHOOTING
Refer to TROUBLESHOOTING .
HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
Required Special Tools
- 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)
| 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. |
Scheme 1
- Ensure that the ignition switch is at the "LOCK" (OFF) position.
- Start up the personal computer.
- Connect special tool MB991827 to special tool MB991824 and the personal computer.
- Connect special tool MB991910 to special tool MB991824.
- Connect special tool MB991910 to the data link connector.
- Turn the power switch of special tool MB991824 to the "ON" position. NOTE: When special tool MB991824 is energized, special tool MB991824 indicator light will be illuminated in a green color.
- Start the M.U.T.-III system on the personal computer. NOTE: Disconnecting scan tool MB991958 is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.
HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES
Required Special Tools
- 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)
Note. If the battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool MB991958 does not display.
- Connect scan tool MB991958 to the data link connector.
- Turn the ignition switch to the "ON" position.
- Select "System select" from the start-up screen.
- Select "From 2006 MY" of "Model Year." When the "Vehicle Information" is displayed, check the contents.
- Select "ETACS" from "System List", and press the "OK" button. NOTE: When the "Loading Option Setup" list is displayed, check the applicable item.
- Select "Diagnostic Trouble Code." to read the DTC.
- If a DTC is set, it is shown.
- Choose "Erase DTCs" to erase the DTC.
TROUBLE SYMPTOM CHART
| Trouble symptom | Inspection Procedure | |
|---|---|---|
| Ignition key cylinder illumination light does not illuminate/extinguish normally. | Vehicles with WCM | Refer to INSPECTION PROCEDURE 1: IGNITION KEY CYLINDER ILLUMINATION LIGHT DOES NOT ILLUMINATE/EXTINGUISH NORMALLY. < VEHICLES WITH WCM > |
| Defective power supply system of the ignition switch | Refer to INSPECTION PROCEDURE 2: DEFECTIVE POWER SUPPLY SYSTEM OF THE IGNITION SWITCH | |
IGNITION SWITCH TROUBLE SYMPTOM CHART
Inspection 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. |
Scheme 2
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)
Scheme 3
- 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. Connect scan tool MB991958. Refer to " «HOW TO CONNECT SCAN TOOL (M.U.T.-III)»(ref-592575-S38930909172014011000000) ." Turn the ignition switch to the "ON" position. Check whether the ETACS-ECU related DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the ETACS-ECU. Refer to «ETACS-ECU»(ref-592558-S35490403722014011000000) . 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. IGNITION SWITCH CONDITION TABLE Item No. Item name Normal conditions Item 228 Dr door unlock ON Item 254 IG voltage 1 V or less Item 256 Dr door ajar switch Open Item 264 Handle lock switch Key in --> Key out Item 270 Dr door lock switch Not lock Item 271 Dr door unlock switch Unlock 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. NO < Normal condition is not displayed for item No. 228. >: Troubleshoot the ETACS-ECU. Refer to «INSPECTION PROCEDURE 4 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR LOCK ACTUATOR"»(ref-592558-S36517436422014011000000) ; . NO < Normal condition is not displayed for item No. 254. >: Troubleshoot the ETACS-ECU. Refer to «INSPECTION PROCEDURE 2 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE IGNITION SWITCH (IG1)"»(ref-592558-S20121232692014011000000) ; . NO < Normal condition is not displayed for item No. 256. >: Troubleshoot the ETACS-ECU. Refer to «INSPECTION PROCEDURE 6 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT THE FRONT DOOR SWITCH (RH)"»(ref-592558-S00823668122014011000000) ; . NO < Normal condition is not displayed for item No. 264. >: Troubleshoot the ETACS-ECU. Refer to «INSPECTION PROCEDURE 3 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM KEY REMINDER SWITCH"»(ref-592558-S14332117072014011000000) ; . NO < Normal condition is not displayed for item No. 270, 271. >: Troubleshoot the ETACS-ECU. Refer to «INSPECTION PROCEDURE 4 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM FRONT DOOR LOCK ACTUATOR"»(ref-592558-S36517436422014011000000) ; .
- STEP 3. Check key reminder switch connector C-213, 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-213, 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-213 (terminal No. 5) and ETACS-ECU connector C-315 (terminal No. 18). Check the input/output line for open circuit and short circuit. Q: Is the check result normal? YES: Go to Step 5. NO: Repair the wiring harness between key reminder switch connector C-213 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-213 (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-213 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 (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(ref-592551-S36408212772014011000000) ). NO: Replace the ETACS-ECU.
Scheme 4
- The ignition switch may be defective
- The fuse No. 14 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
Required Special Tools
- MB992006: Extra fine probe
- MB991223: Harness set
Scheme 5
- STEP 1. Check ignition switch connector C-212 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is ignition switch connector C-212 in good condition? YES: Go to Step 2. NO: Repair the defective connector.
- STEP 2. Check the battery power supply circuit to the ignition switch. Measure the voltage at ignition switch connector C-212. Disconnect the connector, and measure at the wiring harness side. Measure the voltage between terminal 1 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 6 . NO: Go to Step 3.
- STEP 3. Check the fuse No. 14. Q: Is the check result normal? YES: Go to Step 4. NO: Replace the fuse No. 14. (Check that there is not a short to ground in the circuit of lower reaches before replacing. If there are any problems, replace the fuse after the circuit of lower reaches is repaired.)
- STEP 4. Check ETACS-ECU connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is ETACS-ECU connector C-317 in good condition? YES: Go to Step 5. NO: Repair the damaged parts.
- STEP 5. Check the Wiring harness between ignition switch connector C-212 (terminal No. 1) and ETACS-ECU connector C-317 (terminal No. 3). Check the battery power supply line for open circuit. Q: Is the check result normal? YES: Go to Step 7 . NO: Repair the wiring harness.
- STEP 6. Check the ignition switch. Remove the ignition switch. Then check continuity between the switch terminal. IGNITION SWITCH CONTINUITY TABLE Ignition key position Terminal number Normal condition LOCK 1 - 2, 1 - 4, 1 - 5, 1 - 6 No continuity ACC 1 - 6 Continuity exists (2 ohms or less) ON 1 - 2 - 4 - 6 Continuity exists (2 ohms or less) START 1 - 2 - 5 Continuity exists (2 ohms or less) Q: Is the ignition switch in good condition? YES: Go to Step 7. NO: Replace the ignition switch.
- STEP 7. Retest the system. Q: When the ignition switch is operated, do the equipment and system work normally? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(ref-592551-S36408212772014011000000) ). NO: Replace the ETACS-ECU.
KEY REMINDER SWITCH INSPECTION
With the key reminder switch mounted to the vehicle, disconnect the key reminder switch connection connector, and then perform the continuity check.
| Key status | Terminal number | Normal condition |
|---|---|---|
| Key removed | 2 - 3 | Continuity exists (2 ohms or less) |
| Key inserted | 2 - 3 | No continuity |
KEY REMINDER SWITCH CONDITION