Circuit Description
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 combinations. The BCM will only recognize the last learned valid code.
Conditions for Running the DTC
The ignition switch is cycled to CRANK and released to ON.
Conditions for Setting the DTC
| • | 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. |
Action Taken When the DTC Sets
| • | If the DTC sets during cranking, the car will not start and the theft indicator remains illuminated. |
| • | If the DTC sets while the engine is running, the car will start on future attempts and the theft indicator flashes. |
| • | 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 will cause the malfunction to appear. |
Test Description
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 | Was the Theft Deterrent Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the PASSLOCK DATA VOLTAGE is within the specified range? | 0.4-4.9v | 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? | 4.9v | 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 9 | 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 9 | Go to Step 6 |
6 |
Important: Perform the setup procedure for the body control module. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 9 | -- |
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 9 | Go to Step 8 |
8 |
Important: Perform the relearn procedure for the Passlock™ sensor. Refer to Programming Replacement Lock Cylinder, Body Control Module or Powertrain Control Module . Replace the Passlock™ sensor. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
