Pinpoint Test D: The Alarm System Does Not Operate Correctly - The Alarm Does Not Arm/Inhibit From The Luggage Compartment Lid
Anti-Theft
Pinpoint Test D: The Alarm System Does Not Operate Correctly - The Alarm Does Not Arm/Inhibit From The Luggage Compartment Lid
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) monitors the luggage compartment lid disarm switch on circuit CRT18 (luggage compartment lid disarm switch sense circuit) for a ground signal. The luggage compartment lid disarm switch is a normally open switch. When the key is turned to the unlock position, the disarm switch completes the circuit to ground on ground circuit GD171 signaling the SJB (Smart Junction Box) that an authorized entry to the luggage compartment is occurring. The SJB (Smart Junction Box) inhibits the alarm from activating until the luggage compartment lid is closed, then adds the luggage compartment lid to the protected entry points.
- DTC B2108 (Trunk Key Cylinder Switch Failure)- an on-demand DTC that sets when there is a short to ground in the circuit between the luggage compartment lid disarm switch and the SJB (Smart Junction Box) , or the luggage compartment lid disarm switch is shorted closed internally.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Luggage compartment lid disarm switch
- SJB (Smart Junction Box)
PINPOINT TEST D : THE ALARM SYSTEM DOES NOT OPERATE CORRECTLY - THE ALARM DOES NOT ARM/INHIBIT FROM THE LUGGAGE COMPARTMENT LID
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.
D1 CHECK THE LUGGAGE COMPARTMENT LID DISARM SWITCH
NOTE: The luggage compartment lid disarm switch does not disarm (only inhibits) the perimeter alarm system. Once armed, the perimeter alarm can only be disarmed using the Integrated Keyhead Transmitter (IKT) key, the keyless entry keypad (if equipped), or if a valid Passive Anti-Theft System (PATS) key turns the ignition switch to the ON position.
- Ignition OFF.
- Disconnect: Luggage Compartment Lid Disarm Switch C4320.
- Measure the resistance between the luggage compartment lid disarm switch C4320-1, component side and the luggage compartment lid disarm switch C4320-2, component side while turning the luggage compartment lid lock cylinder to the unlock position, then to the at-rest position.
Is the resistance less than 5 ohms with the luggage compartment lid lock cylinder in the unlock position and greater than 10,000 ohms with the luggage compartment lid lock cylinder in the at-rest position?
Yes
GO to D2.
No
INSTALL a new luggage compartment lid disarm switch. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D2 CHECK CIRCUIT CRT18 (LUGGAGE COMPARTMENT LID DISARM SWITCH INPUT) FOR AN OPEN OR A SHORT TO GROUND
- Disconnect: SJB (Smart Junction Box) C2280C.
- Measure the resistance between the SJB (Smart Junction Box) C2280C-22, circuit CRT18 (YE/GY), harness side and the luggage compartment lid disarm switch C4320-1, circuit CRT18 (YE/GY), harness side; and between the SJB (Smart Junction Box) C2280C-22, circuit CRT18 (YE/GY), harness side and ground.
Is the resistance less than 5 ohms between the SJB (Smart Junction Box) and the luggage compartment lid disarm switch; and greater than 10,000 ohms between the SJB (Smart Junction Box) and ground?
Yes
GO to D3.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D3 CHECK CIRCUIT GD171 (LUGGAGE COMPARTMENT LID DISARM SWITCH GROUND CIRCUIT) FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Measure the resistance between the luggage compartment lid disarm switch C4320-2, circuit GD171 (BK/GY), harness side and ground.
Is the resistance less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to D4.
No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D4 CHECK THE SJB (Smart Junction Box) FOR CORRECT OPERATION
- Disconnect all the SJB (Smart Junction Box) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB (Smart Junction Box) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new SJB (Smart Junction Box). CYCLE each key to the ON position for a minimum of 6 seconds to PROGRAM the Remote Keyless Entry (RKE) function of the IKT (Integrated Keyhead Transmitter) keys. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.