LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Body, Lock & Security System) >> Vehicle Security (Theft Warning) System >> Symptom Chart
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Symptom Chart

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

PROCEDURE Diagnostic procedure
SYMPTOM
1 Vehicle security system cannot be set by.... Door switch Refer to "DOOR SWITCH CHECK (KING CAB) ", "DOOR SWITCH CHECK (CREW CAB) ".
If the above systems are "OK", replace BCM.
Lock/unlock switch Refer to "DOOR LOCK/UNLOCK SWITCH CHECK ".
If the above systems are "OK", check main power window and door lock/unlock switch.
Door outside key Refer to "FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH) CHECK (KING CAB) ", "FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH) CHECK (CREW CAB) ".
If the above systems are "OK", check main power window and door lock/unlock switch.
Security indicator does not turn "ON". Refer to "SECURITY INDICATOR LAMP CHECK ".
If the above systems are "OK", replace BCM.
2 (1) Vehicle security system does not alarm when.... Any door is opened. Refer to "DOOR SWITCH CHECK (KING CAB) ", "DOOR SWITCH CHECK (CREW CAB) ".
If the above systems are "OK", replace BCM.
3 Vehicle security alarm does not activate. Horn alarm Refer to "VEHICLE SECURITY HEADLAMP ALARM CHECK ".
If the above systems are "OK", check horn system. Refer to "HORN ".
Head lamp alarm Refer to "VEHICLE SECURITY HEADLAMP ALARM CHECK ".
If the above systems are "OK", replace BCM.
4 Vehicle security system cannot be canceled by.... Door outside key Refer to "FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH) CHECK (KING CAB) ", "FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH) CHECK (CREW CAB) ".
If the above systems are "OK", check main power window and door lock/unlock switch.
Keyfob Check remote keyless entry function
If the above systems are "OK", replace BCM.
(1) Make sure the system is in the armed phase.