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Inspection Procedure L-1

Theft-alarm System: Theft-alarm system is not armed (theft-alarm indicator light does not illuminate).

NOTE: This troubleshooting procedure requires the use of scan tool MB991502 and SWS monitor kit MB991862. For details on how to use the SWS monitor, refer to "How to use SWS monitor."

Theft-alarm Indicator Light Drive Circuit Part 1:




Theft-alarm Indicator Light Drive Circuit Part 2:






CIRCUIT OPERATION
- When the ETACS-ECU receives a "LOCK" signal from the door lock actuator switch, it illuminates the security indicator light for approximately 18 seconds, and then set the theft-alarm system.

- The ETACS-ECU sets the theft-alarm system according to the input signals from the following signals:
- Ignition key reminder switch: ON
- Driver's and front passenger's door switch: OFF
- Rear door switches: OFF
- Driver's and front passenger's door lock key cylinder switch: OFF
- Driver's, front passenger's and rear doors actuator switch: LOCK
- Trunk lid latch switch: OFF
- Hood switch: OFF
- Transmitter switch: LOCK

- Vehicle condition:
- Ignition key: Removed from the ignition key cylinder
- All doors: Closed
- Driver's and front passenger's door lock key cylinder: Not being operated
- Trunk lid: Closed
- Hood: Closed
- Transmitter: Turn to the "LOCK" position

TECHNICAL DESCRIPTION (COMMENT)
If the theft-alarm system is set normally, the input signal circuit, the "SECURITY" indicator light or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The theft-alarm indicator light may be defective
- The ignition key reminder switch may be defective
- The driver's or front passenger's door switch may be defective
- The door switches may be defective
- The driver's or front passenger's door lock key cylinder switch may be defective
- The driver's, front passenger's, the rear door lock actuator switch may be defective
- The trunk lid latch switch may be defective
- The hood switch may be defective
- The transmitter 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:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS monitor kit







STEP 1. Use scan tool MB991502 to select "ECU COMM CHK" on the SWS monitor display.

Check the ETACS-ECU.

CAUTION:
To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Connect the DLC harness before connecting the column-ECU harness. Be sure to connect SWS monitor kit MB991862 after turning on scan tool MB991502.

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" menu for the "ETACS ECU" menu.

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

YES: Go to Step 2.

NO: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible."







STEP 2. Check at ETACS-ECU connector C-94 in order to check the theft-alarm indicator light circuit.

1. Disconnect ETACS-ECU connector C-94, and measure at the wiring harness side.
2. The theft-alarm indicator light should illuminate when terminal 74 is grounded.

Q: Does the theft-alarm indicator light illuminate?

YES: Go to Step 9.

NO: Go to Step 3.







STEP 3. Check the theft-alarm indicator light.

1. Remove the combination meter. Refer to combination meter.
2. Disconnect combination meter connector C-30.
3. The theft-alarm indicator light should illuminate when battery voltage is applied between terminals 1 and 2.

Q: Does the theft-alarm indicator light illuminate?

YES: Go to Step 4.

NO: Replace the theft-alarm indicator light. The theft-alarm indicator light should illuminate, and the theft-alarm system should be set normally.







STEP 4. Check the battery power supply circuit to the theft-alarm indicator light circuit. Test at combination meter connector C-30.

1. Disconnect combination meter connector C-30 and measure the voltage available at the wiring harness side of the connector.

2. 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 7.

NO: Go to Step 5.




STEP 5. Check combination meter connector C-30 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is combination meter connector C-30 in good condition?

YES: Go to Step 6.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The theft-alarm indicator light should illuminate, and the theft-alarm system should be set normally.







STEP 6. Check the wiring harness between combination meter connector C-30 (terminal 1) and the battery.

NOTE: Also check intermediate connector C-66 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-66 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between combination meter connector C-30 (terminal 1) and the battery in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The theft-alarm indicator light should illuminate, and the theft-alarm system should be set normally.







STEP 7. Check combination meter connector C-30 and ETACS-ECU connector C-94 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are combination meter connector C-30 and ETACS-ECU connector C-94 in good condition?

YES: Go to Step 8.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The theft-alarm indicator light should illuminate, and the theft-alarm system should be set normally.







STEP 8. Check the wiring harness between combination meter connector C-30 (terminal 2) and ETACS-ECU connector C-94 (terminal 74).

Q: Is the wiring harness between combination meter connector C-30 (terminal 2) and ETACS-ECU connector C-94 (terminal 74) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The theft-alarm indicator light should illuminate, and the theft-alarm system should be set normally.







STEP 9. Check the input signal by using "DATA LIST" menu of the SWS monitor.

Satisfy the following conditions to check the driver's and front passenger's door switches.
- Driver's door: Open (driver's door switch is on) However, the door should be closed when checking the front passenger's door switch.
- Front passenger's door: Open (front passenger's door switch is on)

However, the door should be closed when checking the driver's door switch.
1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.

3. Operate scan tool MB991502 according to the procedure below to display "ETACS ECU."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."




4. The scan tool should show the above values when each switch is operated.

NOTE: The scan tool display changes when the driver's or the front passenger's door is opened. If any of the doors is open, the system can not be checked correctly.

Q: Does the scan tool show the respective normal condition for item "FRONT DOOR SW."

YES: Go to Step 10.

NO: Refer to Inspection Procedure M-4 "ETACS-ECU does not receive any signal from the driver's or front passenger's door switch."




STEP 10. Check the input signal by using the pulse check mode of the monitor.

Check the input signals from the following switches:
- Key reminder switch
- Driver's, front passenger's and rear door lock actuator switch
- Driver's and front passenger's door lock key cylinder switch
- Food switch
- Trunk lid latch switch

Operate scan tool MB991502 according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."




Check if scan tool MB991502 sounds or not.

Q: When the key reminder switch, driver's, front passenger's and rear door lock actuator switches, driver's and front passenger's door look key cylinder switches, hood switch, trunk lid latch switch and trunk lid lock key cylinder switch are operated, does scan tool MB991502 sound in all cases?

YES: Replace the ETACS-ECU. The theft-alarm indicator light should illuminate, and the theft-alarm system should be set normally.

NO:
- Scan tool MB991502 does not sound when the key reminder switch is operated: Refer to Inspection Procedure N-1 "ETACS-ECU does not receive a signal from the key reminder switch."
- Scan tool MB991502 does not sound when the driver's or the front passenger's, the rear and the back door lock actuator switches are operated: Refer to Inspection Procedure N-6 "ETACS-ECU does not receive signals from the driver's or the front passenger's door lock actuator switches."
- Scan tool MB991502 does not sound when the driver's and the front passenger's door lock actuator switches are operated: Refer to Inspection Procedure N-5 "ETACS-ECU does not receive signals from the driver's and the front passenger's door lock key cylinder switches."
- Scan tool MB991502 does not sound when the hood switch is operated: Refer to Inspection Procedure N-8 "ETACS-ECU does not receive any signal from the hood switch."
- Scan tool MB991502 does not sound when the trunk lid latch switch is operated: Refer to Inspection Procedure N-9 "ETACS-ECU does not receive any signal from the trunk lid latch switch."
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