Eclipse L4-2.4L SOHC (2004)
CIRCUIT OPERATION
When the theft-alarm system is triggered, the ETACS-ECU sounds the theft-alarm horn and all the vehicle horns.
TECHNICAL DESCRIPTION (COMMENT)
If the theft-alarm horn and the vehicle horns do not sound when the theft-alarm system is triggered, the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
-
Malfunction of the theft-alarm horn
-
Malfunction of the horn
-
Malfunction of the theft-alarm horn relay
-
Malfunction of the horn relay
-
Malfunction of the ETACS-ECU
-
Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
-
MB991223: Test Harness Set
STEP 1. Check which horn is defective.
Check which horn does not sound when the theft-alarm system is triggered.
Q: Which horn does not sound?
theft-alarm horn: Go to Step 2.
horn: Go to Step 12.
theft-alarm horn and all vehicle horns: Replace the ETACS-ECU. All the vehicle horn (including the theft-alarm horn) should sound when the
theft-alarm system is triggered.
STEP 2. Check the theft-alarm horn.
1. Remove the horn.
2. Connect the battery as shown, and check that the theft-alarm horn sounds.
