B2711

CIRCUIT DESCRIPTION
The instrument panel cluster (IPC) supplies a 5 volt signal and a ground circuit for the PASS-Key(R) system. This allows the IPC to detect PASS-Key(R) resistance values. Inserting the PASS-Key(R) (with resistor pellet) in the ignition lock cylinder completes the PASS-Key(R) circuit. Contacts in the ignition lock cylinder mate with the pellet contacts. The IPC compares the resistance value of the key pellet to the valid resistance programmed into the IPC. If the proper resistance value is read, the IPC allows the engine to start. If the resistance value is incorrect, a malfunction is present and a DTC will set.

CONDITIONS FOR SETTING THE DTC
The DTC will set under the following conditions:
^ B2710 indicates that an open or zero resistance value was measured from the key pellet prior to obtaining a valid resistance measurement.
^ B2711 indicates that an open or zero resistance value was measured from the key pellet following a valid resistance measurement.

ACTION TAKEN WHEN THE DTC SETS
^ When DTC B2710 is set as current, the IPC displays the STARTING DISABLED, REMOVE IGNITION KEY message on the driver message center and prevents the vehicle from starting.
^ When DTC B2711 is set as current, the IPC displays the THEFT SYSTEM PROBLEM, CAR MAY NOT RESTART message on the driver message center and allows the vehicle to continue to run.

CONDITIONS FOR CLEARING THE DTC
^ This DTC requires an ignition cycle in order to change from current to history.
^ The IPC detects a valid PASS-Key(R) resistance value on the PASS-Key(R) signal circuit.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Use a scan tool.

DIAGNOSTIC AIDS
^ If the key resistor pellet is incorrect, the engine will not start. This state will last about 3 minutes. If a key is inserted, or the ignition is turned ON again before the 3 minute time frame is complete, the timer will reset to 3 minutes. Disconnecting the battery will not clear the timer sequence, but the timer will reset to 3 minutes when the battery power is restored. Even if a proper key is inserted during ore of the time periods, the vehicle will not start until the total time period has elapsed.
^ If there is a short between the PASS-Key(R) signal and ground circuit, or a short to ground on the PASS-Key(R) signal circuit, the vehicle will exhibit a no start condition.

TEST DESCRIPTION

Steps 1-3:

Steps 4-12:

The number(s) below refer to the step number(s) on the diagnostic table.
4. This test verifies the integrity of the key resistor circuits between the ignition switch and the BCM.