The body control module (BCM) will read an analog voltage from the Passlock™ sensor. Based on an internal reference, the BCM will determine if the measured voltage is in one of the following conditions:
• | Open |
• | Shorted to ground |
• | A valid code |
• | A tamper code |
There are 10 possible valid code combination. The BCM will only recognize the last learned valid code.
• | The ignition switch is ON. |
• | The BCM signal input is less than 0.4 volts for 1 second after turning the ignition switch to the CRANK position. |
• | The vehicle will not start if the fault occurs before you start the vehicle. The security indicator will flash for 10 minutes then turn ON steady. |
• | If the vehicle is running when the fault occurs, the BCM will be in the fail enable mode allowing the vehicle to start and run. The security indicator will be ON. |
• | The DTC will clear once the ignition cycle has occurred without the fault recurring. |
• | The BCM history codes will clear once 100 concurrent ignition cycles occur without the fault recurring. |
• | Using a scan tool. |
• | When replacing the Passlock™ sensor, all of the following components are included as a replacement part and must be replaced: |
- | The lock |
- | The sensor |
- | The filter |
- | The harness |
• | Use a scan tool in order to inspect the Passlock™ data voltage and the Passlock™ code. |
• | Perform a visual inspection of the wiring and the connectors. |
• | Following a repair the tamper timer needs 10 minutes in order to expire. |
The numbers below refer to the step numbers on the diagnostic table.
Tests for proper operation of the circuit in the high voltage range.
Tests for a short to ground in the Passlock™ sensor signal circuit.
Step | Action | Value(s) | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
1 | Did you perform the Theft Deterrent (VTD) Diagnostic System Check? | -- | Go to Step 2 | |||||
2 |
Does the scan tool indicate that the Passlock™ data voltage is within the specified range? | 0.4-4.9 v | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||
Does the scan tool indicate that the Passlock™ data voltage is greater than the specified value? | 4.9 v | Go to Step 7 | Go to Step 4 | |||||
Test the Passlock™ sensor signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 5 | |||||
5 | Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 6 | ||||
6 |
Important: Perform the set up procedure for the body control module . Replace the body control module. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 10 | -- | ||||
7 | Inspect for poor connections at the Passlock ™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | ||||
8 | Replace the Passlock™ sensor in the lock cylinder housing assembly.
Did you complete the replacement? | -- | Go to Step 9 | -- | ||||
9 | Perform one of the following Passlock™ learn procedures:
Is the repair complete? | -- | Go to Step 10 | -- | ||||
10 |
Does the DTC reset? | -- | Go to Step 3 | System OK |