Page 959 of 4284

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase the current RKE/Thatcham Alarm Module DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
Cycle the ignition on and off 5 times.
With the DRBIIIt, read the current RKE/Thatcham Alarm Module DTC's.
Does the DRBIIItdisplay: INTERNAL ULTRASONIC FAULT?All
Ye s®Go To 2
No®Go To 12
2 Turn the ignition off.
Disconnect the Front Intrusion Sensor connector.
Connect a voltmeter to the Front Intrusion Sensor Signal circuit at the Intrusion
Sensor connector.
Turn the ignition on while observing the voltmeter.
NOTE: Voltage will only be present during the first 6 seconds when the
ignition is turned on.
Is the voltage above 10.0 volts when the ignition is initially turned on?All
Ye s®Go To 3
No®Go To 11
3 Turn the ignition off.
Measure the resistance of the Sensor Ground circuit at the Front Intrusion Sensor
connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 4
No®Go To 10
4 Replace the Front Intrusion Sensor with a known good sensor.
Turn the ignition on.
With the DRBIIIt, monitor the Intrusion Sensor.
Does the DRBIIItshow: INTRUSION DETECTED?All
Ye s®Replace the Front Intrusion Sensor.
Perform VTSS VERIFICATION TEST - 1A.
No®Go To 5
5 Turn the ignition off.
Disconnect the Rear Intrusion Sensor connector.
Connect a voltmeter to the Rear Intrusion Sensor Signal circuit at the Intrusion
Sensor connector.
Turn the ignition on while observing the voltmeter.
NOTE: Voltage will only be present during the first 6 seconds when the
ignition is turned on.
Is the voltage above 10.0 volts when the ignition is initially turned on?All
Ye s®Go To 6
No®Go To 9
930
VEHICLE THEFT/SECURITY
INTERNAL ULTRASONIC FAULT ÐContinued
Page 964 of 4284
Symptom:
LOOPBACK ERROR
When Monitored and Set Condition:
LOOPBACK ERROR
When Monitored: During power up, following detection of any other Bus errors.
Set Condition: Internally transmitted message on the PCI Bus is not received correctly.
POSSIBLE CAUSES
INTERMITTENT CONDITION
RKE/THATCHAM ALARM MODULE - INTERNAL MALFUNCTION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase the current RKE/Thatcham Alarm Module DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIIIt, read the current RKE/Thatcham Alarm Module DTC's.
Does the DRBIIItdisplay: LOOPBACK ERROR?All
Ye s®Replace the RKE/Thatcham Alarm Module.
Perform VTSS VERIFICATION TEST - 1A.
No®The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition.
Perform VTSS VERIFICATION TEST - 1A.
935
VEHICLE THEFT/SECURITY
Page 965 of 4284
Symptom:
NO VALID MESSAGES RECEIVED
When Monitored and Set Condition:
NO VALID MESSAGES RECEIVED
When Monitored: Continuously with the ignition on.
Set Condition: The RKE/Thatcham Alarm Module does not receive any valid messages on
the PCI Bus for a minimum of 5 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
RKE/THATCHAM ALARM MODULE - INTERNAL MALFUNCTION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase the current RKE/Thatcham Alarm Module DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIIIt, read the current RKE/Thatcham Alarm Module DTC's.
Does the DRBIIItdisplay: NO VALID MESSAGES RECEIVED?All
Ye s®Replace the RKE/Thatcham Alarm Module.
Perform VTSS VERIFICATION TEST - 1A.
No®The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition.
Perform VTSS VERIFICATION TEST - 1A.
936
VEHICLE THEFT/SECURITY
Page 969 of 4284

Symptom:
VEHICLE THEFT ALARM INDICATOR OUTPUT OPEN
When Monitored and Set Condition:
VEHICLE THEFT ALARM INDICATOR OUTPUT OPEN
When Monitored: Continuously with the ignition on.
Set Condition: The BCM has detected an open in the VTSS Indicator Driver circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
VTA LAMP FUNCTIONAL TEST
VTSS INDICATOR DRIVER CIRCUIT OPEN
BODY CONTROL MODULE INTERNAL MALFUNCTION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase the current Body Control Module DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIIIt, read the current Body Control Module DTC's.
Does the DRBIIItdisplay: VTA INDICATOR OUTPUT OPEN?All
Ye s®Go To 2
No®The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition.
Perform VTSS VERIFICATION TEST - 1A.
2 With the DRBIIIt, actuate the VTA Indicator Lamp.
Did the VTA Lamp flash on and off during the actuation?All
Ye s®Replace the Body Control Module.
Perform VTSS VERIFICATION TEST - 1A.
No®Go To 3
3 Disconnect the Message Center harness connector.
Disconnect the Body Control Module C4 harness connector.
Measure the resistance of the VTSS Indicator Driver circuit.
Is the resistance below 5.0 ohms?All
Ye s®Replace the Body Control Module.
Perform VTSS VERIFICATION TEST - 1A.
No®Repair the VTSS Indicator Driver circuit for an open.
Perform VTSS VERIFICATION TEST - 1A.
940
VEHICLE THEFT/SECURITY
Page 970 of 4284

Symptom:
VEHICLE THEFT ALARM INDICATOR OUTPUT SHORT
When Monitored and Set Condition:
VEHICLE THEFT ALARM INDICATOR OUTPUT SHORT
When Monitored: Continuously with the ignition on.
Set Condition: The BCM has detected a short to ground in the VTSS Indicator Driver
circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
MESSAGE CENTER INTERNAL MALFUNCTION
BODY CONTROL MODULE INTERNAL MALFUNCTION
VTSS INDICATOR DRIVER CIRCUIT SHORTED TO GROUND
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase the current Body Control Module DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIIIt, read the current Body Control Module DTC's.
Does the DRBIIItdisplay: VTA INDICATOR OUTPUT OPEN?All
Ye s®Go To 2
No®The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition.
Perform VTSS VERIFICATION TEST - 1A.
2 Disconnect the Body Control Module C4 connector.
Measure the resistance between ground and the VTSS Indicator Driver circuit.
Is the resistance below 5.0 ohms?All
Ye s®Go To 3
No®Replace the Body Control Module.
Perform VTSS VERIFICATION TEST - 1A.
3 Disconnect the Body Control Module C4 connector.
Disconnect the Message Center connector.
Measure the resistance of the VTSS Indicator Driver circuit to ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the VTSS Indicator Driver circuit for a short to ground.
Perform VTSS VERIFICATION TEST - 1A.
No®Replace the Message Center assembly.
Perform VTSS VERIFICATION TEST - 1A.
941
VEHICLE THEFT/SECURITY
Page 971 of 4284
Symptom:
*ALARM TRIPS ON ITS OWN
POSSIBLE CAUSES
ALARM TRIPPED BY
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1 With the DRBIIIt, read the Alarm Tripped By status.
Were there any causes displayed?All
Ye s®Refer to Symptom List for problems related to the component
indicated by the DRBIIIt.
Perform VTSS VERIFICATION TEST - 1A.
No®The condition that caused this symptom is currently not present.
Inspect the related wiring harness for a possible intermittent
condition. Look for any chafed, pierced, pinched or partially
broken wires.
Perform VTSS VERIFICATION TEST - 1A.
942
VEHICLE THEFT/SECURITY
Page 972 of 4284
Symptom:
*HOOD DOES NOT TRIP VTSS
POSSIBLE CAUSES
CHECK DRBIIItFOR HOOD AJAR SWITCH RESPONSE
BODY CONTROL MODULE
TEST ACTION APPLICABILITY
1 With the DRBIIIt, read the HOOD AJAR SW status.
Open the hood.
Does the DRBIIItdisplay CLOSED?All
Ye s®Replace the Body Control Module.
Perform VTSS VERIFICATION TEST - 1A.
No®Refer to symptom HOOD AJAR CKT OPEN in the DOOR AJAR
category.
Perform VTSS VERIFICATION TEST - 1A.
943
VEHICLE THEFT/SECURITY
Page 973 of 4284
Symptom:
*LEFT FRONT DOOR DOES NOT TRIP VTSS
POSSIBLE CAUSES
BODY CONTROL MODULE
CHECK DRBIIItFOR DRIVER DOOR AJAR RESPONSE
TEST ACTION APPLICABILITY
1 With the DRBIIIt, read the DRVR DOOR AJAR SW status.
Open the driver door.
Does the DRBIIItdisplay CLOSED?All
Ye s®Replace the Body Control Module.
Perform VTSS VERIFICATION TEST - 1A.
No®Refer to symptom DRIVER DOOR AJAR CKT OPEN in the
DOOR AJAR category.
Perform VTSS VERIFICATION TEST - 1A.
944
VEHICLE THEFT/SECURITY