Simplified Wiring System (Sws) - Except Evolution: Diagnosis Mitsubishi Lancer IX

BEFORE CARRYING OUT TROUBLESHOOTING

Before carrying out troubleshooting, check the following 2 items

1. Make sure that the ETACS-ECU, the junction block (J/B), the front-ECU and the engine compartment relay box are connected securely.
2. Make sure that fuses and fusible links related to relevant systems are not blown.

SWS DIAGNOSTIC TROUBLESHOOTING STRATEGY

1. Gather information about the problem from the customer.
2. Verify that the condition described by the customer exists.
3. Version number and destination check. Check whether the SWS version number (0) and destination (North America) meet the vehicle specifications. If they are different, replace the ETACS-ECU with a correct one.
4. Use scan tool to select "ECU COMM CHK" on the SWS monitor display. Check whether the communication status of the input- or output-signal-side ECU associated with the defective function is normal. If "OK" is displayed for all related ECUs, they communicate with each other normally and the input or output signal circuit system may be defective. Therefore, check SWS monitor service data. If "NG" is displayed for any of the related ECUs, something may be wrong with the ECU for which "NG" appears, its power supply or grounding system, or a wiring harness or connector between the SWS monitor and the ECU. Check the wiring harness and connectors associated with the ECU and examine the ECU itself.
5. Service data on the SWS monitor. Select the defective function from the function-specific diagnostic menu, and check the service data that appears for each function item. When the SWS communication line is monitored. You can determine whether the problem lies in the input or output signal circuit system by checking whether communication data is correct. The switch condition does not meet the service data display: Input signal system related to defective functions. The switch condition meets the service data display: Output signal system related to defective functions.
6. Check of input signal circuit system. Check relevant switch, sensor, input signal-side ECU and their wiring harness and connector.
7. Check of output signal circuit system. Check an output signal-side ECU, electrical load components and their wiring harness and connector.

FUNCTION DIAGNOSIS

The following shows the service data and their normal condition, which are displayed during the "FUNCTION DIAG". The row "NORMAL CONDITION" shows values, which are shown when each operation is made.

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Troubleshooting Hints

1. The SWS monitor body (I/F cartridge) may be defective.
2. The SWS monitor harness may be defective.
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The ETACS-ECU may be defective
2. The column switch may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Step 1: Use Scan Tool MB991502 To Select "ECU COMM CHK" On The SWS Monitor Display

Check the following ECUs

1. ETACS-ECU
2. Column-ECU

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "ETACS ECU" and the "COLUMN ECU" menus.

Is "OK" displayed on both the "ETACS ECU" and "COLUMN ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S16910447382004122200000) .
2. "NG" Is Displayed On The "Column ECU" Menu Go to step «6»(ref-169966-S21466463612004122200000) .
3. "NG" Is Displayed On The "ETACS ECU" Menu See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .
4. "NG" Are Displayed For All The Items See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The ETACS-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The ETACS-ECU may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S28358538722004122200000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The sunroof motor assembly may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The key reminder switch may be defective.
2. The front door switches may be defective.
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check The ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S00640229832004122200000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The front door switches may be defective.
2. The column switch (turn-signal light and lighting switch) may be defective.
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the following ECU's

1. ETACS-ECU
2. Column-ECU

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "ETACS ECU" and the "COLUMN ECU" menus.

Is "OK" displayed on both the "ETACS ECU" and "COLUMN ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S26298164672004122700000) .
2. "NG" Is Displayed On The "ETACS-ECU" Menu See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .
3. "NG" Is Displayed On The "Column ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .

1. The driver's seat belt switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. When the ignition switch is turned to the "ON" position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S03170542532004122700000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The ETACS-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S18350186892004122700000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The driver's door lock actuator, front passenger's door lock actuator or rear door lock actuator may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The power window switch (door lock switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Diagnosis

Check the input signal by using the pulse check mode of the monitor. Check the input signals from the door lock switch

1. Connect scan tool MB991502 to the data link connector.
2. Operate scan tool MB991502 as follows: Select "SYSTEM SELECT." Select "SWS." Select "PULSE CHECK."
3. Move the driver's or the front passenger's door lock switch from "LOCK" to "UNLOCK" or vice versa.
4. Check scan tool MB991502 sounds or not.

Does scan tool MB991502 sound when the driver's or the front passenger's door lock switch is moved from "LOCK" to "UNLOCK" or vice versa?

1. YES Replace the ETACS-ECU. All the doors should be locked and unlocked by the door lock switch.
2. NO See «INSPECTION PROCEDURE N-7: THE ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE DOOR LOCK SWITCH (INCORPORATED IN POWER WINDOW MAIN SWITCH AND POWER WINDOW SUB SWITCH)»(ref-169966-S07138585482004122700000) .

Scheme 10

1. The power window switch (door lock switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the input signal by using the pulse check mode of the monitor. Check the input signals from the door lock key cylinder switch.

1. Connect scan tool MB991502 to the data link connector.
2. Use the driver's or passenger's door lock key cylinder to lock and unlock the doors.
3. Operate the MUT-II according to the procedure below to display "PULSE CHECK." Select "SYSTEM SELECT." Select "SWS." Select "PULSE CHECK."
4. Check scan tool MB991502 sounds or not.

When the doors are locked and unlocked by using the driver's or front passenger's door lock key cylinder, does scan tool MB991502 sound?

1. YES Replace the ETACS-ECU. All the doors should be locked and unlocked by using each door lock key cylinder switch.
2. NO See «INSPECTION PROCEDURE N-5: THE ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE DRIVER'S DOOR LOCK KEY CYLINDER SWITCH»(ref-169966-S35667096772004122700000) .

Scheme 11

1. The driver's door lock actuator switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the input signal by using the pulse check mode of the monitor. Check the input signals from the driver's door lock actuator switch.

1. Connect scan tool MB991502 to the data link connector.
2. Lock or unlock the driver's inside lock knob.
3. Operate the MUT-II as follows: Select "SYSTEM SELECT." Select "SWS." Select "PULSE CHECK."
4. Check scan tool MB991502 sounds or not.

Does scan tool MB991502 sound when the driver's inside lock knob is locked or unlocked?

1. YES Replace the ETACS-ECU. Check that all the doors can be locked or unlocked by operating the driver's inside lock knob.
2. NO See «INSPECTION PROCEDURE N-6: THE ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE DRIVER'S DOOR LOCK ACTUATOR SWITCH»(ref-169966-S20986243782004122700000) .

Scheme 12

Scheme 13

1. The power window relay may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "ON" position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S22668449812004122700000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The front door switches may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S35413770852004122700000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The power window main switch may be defective.
2. The power window motor (front: LH) may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The power window main switch may be defective.
2. The front power window sub-switch (RH) may be defective.
3. The rear power window sub-switch (LH) may be defective.
4. The rear power window sub-switch (RH) may be defective.
5. The front power window motor (RH) may be defective.
6. The rear power window motor (LH) may be defective.
7. The rear power window motor (RH) may be defective.
8. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Troubleshooting Hint

The power window main switch may be defective.

Verify that power window sub-switches operate normally.

A power window can not work by means of the power window main switch. Can you operate the power window by means of the corresponding power window sub-switch?

1. YES Replace the power window main switch. Verify that the front or rear passenger's power window can work normally by means of power window main switch.
2. NO See «FUNCTION SYSTEM SYMPTOM CHART»(ref-169966-S38419175652004122200000) .

Scheme 14

1. The transmitter may be defective.
2. The ETACS-ECU may be defective.

1. The turn-signal light may be defective.
2. The dome light may be defective.
3. The horn may be defective.
4. The ETACS-ECU may be defective.
5. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Step 3: Verify Trouble Symptom

Which answerback function is defective?

1. Only The Dome Light Go to Step «4»(ref-169966-S20802048572004122800000) .
2. Only The Turn-Signal Lights Go to step «5»(ref-169966-S31581806212004122800000) .
3. Only The Horn Go to step «6»(ref-169966-S42347087582004122800000) .
4. None Of The Dome Light And The Turn-Signal Lights And The Horn Replace the ETACS-ECU. Verify that the answerback functions work normally.

1. The key reminder switch may be defective.
2. The hazard warning light switch may be defective.
3. The transmitter may be defective.
4. The ETACS-ECU may be defective.
5. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Step 1: Verify Trouble Symptom

Can the encrypted code register mode be set?

1. YES Go to step «3»(ref-169966-S39187477212004122800000) .
2. NO Go to step «2»(ref-169966-S19005083412004122800000) .

1. The sunroof switch may be defective
2. The sunroof motor assembly may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The sunroof switch may be defective.
2. The sunroof motor assembly may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the input signal by using the pulse check mode of the monitor. Check the input signals from the sunroof switch.

1. Connect scan tool MB991502 to the data link connector.
2. Operate scan tool MB991502 according to the procedure below to display "PULSE CHECK." Select "SYSTEM SELECT." Select "SWS." Select "PULSE CHECK."
3. When each function of the sunroof switch is operated (turned on), check that scan tool MB991502 sounds.

Does scan tool MB991502 sound when the sunroof switch is operated?

1. YES Replace the sunroof motor assembly. Verify that the sunroof works at all positions normally.
2. NO See «INSPECTION PROCEDURE M-8: SUNROOF SWITCH: THE ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE UP, OPEN OR CLOSE/DOWN SWITCH»(ref-169966-S28310485362004122800000) .

Scheme 15

1. The driver's or passenger's door switch may be defective.
2. The sunroof motor assembly may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU and Sunroof motor assembly (sunroof-ECU).

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "ETACS ECU" and the "SUNROOF ECU" menus.

Is "OK" displayed on both the "ETACS ECU" and "SUNROOF ECU" menu?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S08763691342004122800000) .
2. "NG" Is Displayed On The "ETACS-ECU" Menu See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .
3. "NG" Is Displayed On The "SUNROOF ECU" Menu See «INSPECTION PROCEDURE A-5: COMMUNICATION WITH THE SUNROOF MOTOR ASSEMBLY (SUNROOF-ECU) IS NOT POSSIBLE»(ref-169966-S12041157832004122200000) .

The sunroof motor assembly may be defective.

Replace the sunroof motor assembly. The sunroof safety mechanism should now work normally.

Scheme 16

Scheme 17

1. The wiper motor may be defective.
2. The column switch may be defective (windshield wiper and washer switch).
3. The front-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the Column-ECU and Front-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "ON" position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU"?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S19684996612004122800000) .
2. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
3. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

1. The column switch may be defective (windshield wiper and washer switch).
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Use scan tool MB991502 to select "ECU COMM CHK" on the SWS monitor display. Check the Column-ECU and Front-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "ON" position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus?

1. "OK" Is Displayed For All The Items Replace the front-ECU. Check that the windshield wiper works normally.
2. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
3. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

Scheme 18

1. The wiper motor may be defective.
2. The column switch may be defective (windshield wiper and washer switch).
3. The front-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The windshield wiper motor may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The column switch may be defective (windshield wiper and washer switch).
2. The ETACS-ECU may be defective.
3. The front-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The ETACS-ECU may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The windshield washer motor may be defective.
2. The column switch may be defective (windshield wiper and washer switch).
3. The front-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Step 2: Use Scan Tool MB991502 To Select "ECU COMM CHK" On The SWS Monitor Display

Check the Column-ECU and front-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the LOCK (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «3»(ref-169966-S29144580912004122800000) .
2. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
3. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

1. The rear wiper motor may be defective.
2. The column switch may be defective (windshield wiper and washer switch).
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU and column-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "ON" position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "ETACS ECU" and the "COLUMN ECU" menus.

Is "OK" displayed on both the "ETACS ECU" and "COLUMN ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S26099968162004122800000) .
2. "NG" Is Displayed On The "ETACS ECU" Menu See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .
3. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .

1. The rear wiper motor may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The Park/Neutral position switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The rear washer motor may be defective.
2. The column switch (windshield wiper and washer switch) may be defective.
3. The ETACS-ECU may be defective.

1. The driver's side seat belt switch may be defective.
2. The combination meter (seat belt warning light bulb or printed-circuit board) may be defective.
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. When the ignition switch is turned to the "ON" position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «2»(ref-169966-S21128657402004122900000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The column switch (taillight switch) may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the following ECU's

1. Column-ECU
2. Front-ECU

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S12272795692004122900000) .
2. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
3. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

1. The column switch (turn-signal light and lighting switch) may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the following ECU's

1. Column-ECU
2. Front-ECU

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S19350700532005010300000) .
2. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
3. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

1. The column switch (turn-signal light and lighting switch) may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the following ECU's

1. Column-ECU
2. Front-ECU

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." 1. Select "SYSTEM SELECT." 2. Select "SWS." 3. Select "SWS MONITOR." 4. Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus?

1. "OK" Are Displayed For All The Items Go to step «2»(ref-169966-S07222462332005010300000) .
2. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
3. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

1. The column switch may be defective.
2. The front-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The column switch may be defective.
2. The front-ECU may be defective.
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Use scan tool MB991502 to select "ECU COMM CHK" on the SWS monitor display. Check the following ECU's

1. ETACS-ECU
2. Column-ECU
3. Front-ECU

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for the "ETACS ECU", "COLUMN ECU" and "FRONT ECU" menus.

Is "OK" displayed on the "ETACS ECU", "COLUMN ECU" and "FRONT ECU" menus?

1. "OK" Is Displayed For All The Items Replace the front-ECU. Verify that the headlights and the taillights illuminate normally.
2. "NG" Is Displayed On The "ETACS ECU" Menu See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .
3. "NG" Is Displayed On The "COLUMN ECU" Menu See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .
4. "NG" Is Displayed On The "FRONT ECU" Menu See «INSPECTION PROCEDURE A-4: COMMUNICATION WITH THE FRONT-ECU IS NOT POSSIBLE»(ref-169966-S35960912142004122200000) .

Scheme 19

Scheme 20

1. The position light bulb may be defective.
2. The stop/taillight bulb may be defective.
3. The license plate light bulb may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The headlight bulb may be defective
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The high-beam indicator light bulb may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The driver's door switch may be defective.
2. The column switch (turn-signal light and lighting switch) may be defective.
3. The ETACS-ECU may be defective.
4. The front-ECU may be defective.
5. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

The front-ECU may be defective.

Replace the front-ECU. Verify that the headlight dimmer switch automatic resetting function works normally.

Scheme 21

1. The daytime running light-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The daytime running light-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The column switch (turn-signal light and lighting switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The hazard warning light switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The turn-signal light bulb may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The key reminder switch may be defective.
2. The door switch may be defective.
3. The driver's door lock actuator switch may be defective.
4. The dome light may be defective.
5. The ETACS-ECU may be defective.
6. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «3»(ref-169966-S42823259442005010400000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The key reminder switch may be defective.
2. The door switch may be defective.
3. The driver's door lock actuator switch may be defective.
4. The dome light may be defective.
5. The ETACS-ECU may be defective.
6. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The key reminder switch may be defective.
2. The door switches may be defective.
3. The driver's door lock actuator switch may be defective.
4. The ETACS-ECU may be defective.
5. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «3»(ref-169966-S39396711252005010500000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The door switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the ETACS-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Is "OK" displayed on the "ETACS ECU" menu?

1. YES Go to step «3»(ref-169966-S00710083092005010500000) .
2. NO See «INSPECTION PROCEDURE A-3: COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE»(ref-169966-S26128465402004122200000) .

1. The door switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

SCAN TOOL OR VOLTMETER

SCAN TOOL OR VOLTMETER PROBLEMS

Scheme 22

1. The ETACS-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The ETACS-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The backup light switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The Park/Neutral position switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The driver's or front passenger's door switches may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The column switch (turn-signal light and lighting switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the column-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "COLUMN ECU" menu.

Is "OK" displayed on the "COLUMN ECU" menu?

1. YES Go to step «2»(ref-169966-S22725673402005010500000) .
2. NO See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .

1. The column switch (windshield wiper and washer switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

Check the column-ECU.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHK." Select "SYSTEM SELECT." Select "SWS." Select "SWS MONITOR." Select "ECU COMM CHK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "COLUMN ECU" menu.

Is "OK" displayed on the "COLUMN ECU" menu?

1. YES Go to step «2»(ref-169966-S40104804152005010500000) .
2. NO See «INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE»(ref-169966-S19976953012004122200000) .

1. The column switch (windshield wiper and washer switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The sunroof switch may be defective.
2. The sunroof motor assembly may be defective.
3. The ETACS-ECU may be defective.
4. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The key reminder switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The hazard warning light switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The driver's inner seat belt (driver's seat belt switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The driver's, front passenger's, rear or back door switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The driver's door lock key cylinder switch may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The driver's door latch assembly may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The power window main switch or power window sub switch (door lock switch) may be defective.
2. The ETACS-ECU may be defective.
3. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

1. The vehicle speed sensor may be defective.
2. The ETACS-ECU may be defective.
3. Damaged harness wires or connectors.

1. The powertrain control module may be defective.
2. The ETACS-ECU may be defective.
3. Damaged harness wipes or connectors.

1. The transmitter may be defective.
2. The ETACS-ECU may be defective.

1. The ETACS-ECU may be defective.
2. The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.