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Inspection Procedure 3

Inspection Procedure 3: Theft-alarm horn does not sound while the theft-alarm system is triggered.

Theft-alarm Horn Circuit:






CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)
If theft-horn does not sound, the theft-horn input signal circuit or the ETACS-ECU may be defective. Also, the theft-alarm function and horn may have been disabled with a configuration function.

TROUBLESHOOTING HINTS
- Theft-alarm horn may be defective
- Theft-alarm horn relay 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.

Check if DTC is set to the ETACS-ECU.

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 too (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. Refer to Body Control Systems, Diagnosis. Symptom Chart

NO: Go to Step 2.

STEP 2. Using scan tool MB991958, Check the configuration function.

1. Turn the ignition switch to the "ON" position.
2. Use the ETACS-ECU configuration function to check that the "Alarm" is set to "Enable".
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the "Alarm" set to "Enable"?

YES: Go to Step 3.

NO: Use the ETACS-ECU configuration function to set the "Alarm" to "Enable". Programming and Relearning

STEP 3. Check theft-alarm horn relay connector A-17X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is theft-alarm horn relay connector A-17X in good condition?

YES: Go to Step 4.

NO: Repair the damaged parts.

STEP 4. Check the theft-alarm horn relay.

Q: Is the theft-alarm horn relay in good condition

YES: Go to Step 5.

NO: Replace the theft-alarm horn relay.

STEP 5. Measure the voltage at theft-alarm horn relay A-17X.

1. Remove the relay, and measure at the relay box side.




2. Measure the voltage between theft-alarm horn relay connector A-17X (terminal No. 1,4) and the body ground.
- The voltage should measure approximately 2 volts (battery positive voltage).

Q: Is the measured voltage approximately 2 volts (battery positive voltage)?

YES: Go to Step 7.

NO: Go to Step 6.

STEP 6. Check the Wiring harness between theft-alarm horn relay connector A-17X (terminal No. 1,4) and fusible link (36). Check the power supply line for open circuit and short circuit.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).

NO: Repair the wiring harness.between theft-alarm horn relay connector A-17X and fusible link (36).

STEP 7. Check theft-alarm horn connector A-58 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is theft-alarm horn connector A-58 in good condition?

YES: Go to Step 8.

NO: Repair the damaged parts.

STEP 8. Check the Wiring harness between theft-alarm horn connector A-58 (terminal No. 1) and theft-alarm horn relay connector A-17X (terminal No. 3).

Check the output lines for open circuit and short circuit.

NOTE: Before the wiring harness check, check intermediate connector A-03, and then repair them if necessary.

Q: Is the check result normal?

YES: Go to Step 9.

NO: Repair the wiring harness between theft-alarm horn connector A-58 and theft-alarm horn relay connector A-17X.

STEP 9. Check ETACS-ECU connector C-312 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-312 in good condition?

YES: Go to Step 10.

NO: Repair the damaged parts.

STEP 10. Check the Wiring harness between theft-alarm horn relay connector A-17X (terminal No. 2) and ETACS-ECU connector C-312 (terminal No. 15).

Check the output lines for open circuit and short circuit.

Q: Is the check result normal?

YES: Go to Step 11.

NO: Repair the wiring harness between theft-alarm horn relay connector A-17X and ETACS-ECU connector C-312.

STEP 11. Replace theft-alarm horn.

1. Replace the theft-alarm horn.

Q: Does the theft-alarm work normally?

YES: he trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).

NO: Replace the ETACS-ECU.
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