B2957

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The EVO/Passlock (TM) module will read an analog voltage from the Passlock (TM) sensor. Based on an internal reference, the EVO/passlock (TM) 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 (TM) module will only accept the last learned valid code.

CONDITIONS FOR SETTING THE DTC
- The ignition switch is ON.
- The Passlock (TM) sensor signal input is less than 0.4 volts for 1 second after turning the ignition switch to the crank position.

ACTION TAKEN WHEN THE DTC SETS
- The vehicle will not run if the fault occurs before the vehicle is started. The security telltale will flash for 10 minutes and then turn ON steady.
- If the vehicle is running when the fault occurs, the EVO/Passlock (TM) module will be in the fail enabled mode allowing the vehicle to start and run. The security telltale will be ON.

CONDITIONS FOR CLEARING THE DTC
- The DTC will clear after an ignition cycle has occurred without the fault.
- EVO/Passlock (TM) module history codes will be cleared after 100 ignition cycles with no current codes active.
- Using a scan tool

DIAGNOSTIC AIDS
- When replacing the Passlock (TM) sensor, all the sensor components; the lock, the sensor, the filter, and the harness, are included as a replacement part and must be replaced.
- Use the scan tool in order to test the Passlock (TM) data voltage and the Passlock (TM) code.
- Perform a visual inspection of the wiring and the connectors.
- Inspect the Passlock (TM) sensor harness for an intermittent or poor connections (including the in-line connector). Refer to Testing for intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic table.
2. This step tests for a short to ground in CKT 1836.
3. This step tests for the 5 volt reference in the EVO/Passlock (TM) module in order to determine if the module or the Passlock (TM) sensor need to be replaced.