SECURITY Indicator Always On Or Flashing

Diagnostic Trouble Code Chart (Part 1 Of 2):

Diagnostic Trouble Code Chart (Part 2 Of 2):

Wiring Schematic:

CIRCUIT DESCRIPTION
The EVO/Passlock module will read an analog voltage from the Passlock sensor. Based on an internal reference the EVO/Passlock module will determine if the measured voltage is open, shorted to ground, a valid code, or a tamper code. There are 10 possible valid code combinations. The EVO/Passlock module will only accept the last learned valid code.

DIAGNOSTIC AIDS
Prior to cranking, if a problem developed to prevent the Passlock sensor signal from reporting to the EVO/Passlock module, the vehicle will not start and DTC B2958 will not be set. In this case, the scan tool will still read 'Passlock Code Open" after cranking.
^ When replacing the Passlock sensor, all the sensor components; the lock, the sensor, the filter, and the harness, are included as a replacement pan and must be replaced.
^ Use the scan tool in order to test the Passlock data voltage and the Passlock code.
^ Perform a visual inspection of the wiring and the connectors.
^ Inspect the Passlock sensor harness for an intermittent or poor connections (including the in-line connector). Refer to Intermittents and Poor Connections. Intermittents and Poor Connections


TEST DESCRIPTION
The numbers below refer to the numbers in the diagnostic table.
3. This step will determine if the EVO/Passlock module or the harness is causing the Security indicator to stay on.
4. This step determines it there is a short to ground in CKT 749.
6. This step tests for an open in the class 2 line between the EVO/Passlock module terminal B4 and Splice S207.
9. This step verifies if the security fuse randomly opened.
10. This step tests for a short to ground in CKT 1740.
12. This step tests for Ignition voltage input to the EVO/Passlock module.
14. This step tests for battery input to the EVO/Passlock module.