Montero V6-3.8L SOHC (2005)
Horn And Theft-Alarm Horn Drive Circuit Part 2
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
-
The theft-alarm horn may be defective
-
The horn may be defective
-
The theft-alarm horn relay may be defective
-
The 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 Tool:
-
MB991223: 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?
