• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Security Indicator Control | B0685 06 | B0685 06 | B0685 01 | -- |
The security indicator is controlled by the body control module (BCM) based on commands from the immobilizer system or the content theft deterrent (CTD) system. With the ignition OFF, the security indicator is commanded by the CTD system. With the ignition ON, the security indicator is commanded by the immobilizer system.
The security indicator is located in the instrument panel cluster (IPC) and is supplied B+ at all times. When the immobilizer or CTD system requests the indicator be commanded ON, the BCM grounds the security indicator control circuit, illuminating the indicator.
Battery voltage is 9-16 volts.
The BCM detects a short to ground on the security indicator control circuit.
The BCM detects a short to voltage or an open on the security indicator control circuit.
Security indicator output is disabled.
• | A current DTC is cleared when the conditions for setting the DTC are no longer present. |
• | A history DTC will clear after 40 malfunction free ignition cycles. |
Theft Deterrent System Schematics
Content Theft Deterrent (CTD) Description and Operation
Control Module References for scan tool information
Ignition ON, command the security LED output control ON and OFF with a scan tool. The security indicator should turn ON and OFF when changing between the commanded states.
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM or IPC replacement, setup, and programming