Circuit Description
The body control module (BCM) supplies power to the Passlock sensor on CKT 1459.
When the Passlock sensor is powered and the ignition switch is rotated to the CRANK position, the hall effect security sensor will latch and provide a code to the BCM. The BCM will then compare this code to the code in the previous ignition cycle. If the latched value is the same as the last ignition cycle value, the test has passed. When the ignition switch is switched to the OFF position, the sensor is no longer powered and resets the sensor latch circuit.
In the next ignition cycle, the Passlock sensor waits for an ignition switch crank input and verifies the sensor code and compares the sensor code to the last stored valid code.
Conditions for Running the DTC
The ignition switch is cycled to CRANK, released to ON and then cycled to OFF.
Conditions for Setting the DTC
| • | The BCM turns the sensor power OFF for approximately 0.1 seconds when the ignition switch is turned OFF. |
| • | During the 0.1 second shut down of voltage, if the BCM senses battery voltage the DTC will set. |
| • | The sensor power will turn OFF after the 20 minute BCM shut down period. |
Action Taken When the DTC Sets
| • | The vehicle will start and run. |
| • | The SECURITY indicator remains illuminated. |
| • | The SERVICE VEHICLE SOON indicator illuminates. |
Conditions for Clearing the DTC
| • | Current DTCs will clear after one ignition cycle if the malfunction is no longer present. |
| • | All of the BCM history codes will be cleared after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles. |
Diagnostic Aids
| • | Inspect for a poor connection at the Passlock™ Sensor and the BCM. |
| • | If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while wiggling the wiring and connectors. This action often causes the malfunction to appear. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
1 | Was the Theft Deterrent Diagnostic System Check performed? | Go to Step 2 | Go to A Diagnostic System Check - Theft Deterrent |
2 |
Did you find and correct the condition? | Go to Step 8 | Go to Step 3 |
3 | Inspect for a poor connections at the harness connector of the BCM. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | Go to Step 4 |
4 | Inspect for a poor connections at the harness connector of the Passlock™ sensor. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 8 | Go to Step 5 |
Does the PASSLOCK POWER OUTPUT data parameter display ON? | Go to Step 6 | Go to Step 7 | |
6 | Replace the Passlock™ sensor. Important: Perform the relearn procedure for the Passlock™ sensor. Refer to PASSLOCK Reprogramming Seed and Key or PASSLOCK Reprogramming Auto Learn. Did you complete the replacement? | Go to Step 8 | -- |
7 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Important: Perform the setup procedure for the body control module. Refer to BCM Programming/RPO Configuration in Body Control System. Did you complete the replacement? | Go to Step 8 | -- |
8 |
Does the DTC reset? | Go to Step 2 | System OK |
