B1007

CIRCUIT DESCRIPTION
The Passlock module calculates a checksum for the contents of the EEPROM when the voltage is first applied. This calculated checksum is compared with the checksum value stored in the EEPROM.

CONDITIONS FOR SETTING THE DTC
The calculated checksum is compared with the checksum value stored in the EEPROM. If the 2 values are not equal, DTC B1007 is set. The Passlock module writes certain information onto the EEPROM. If the Passlock module is unable to write onto the EEPROM, DTC B1007 is set.

CONDITIONS FOR CLEARING THE MIL/DTC
1. A history DTC will clear after 100 consecutive ignition cycles occur without a fault.
2. Use the Scan Tool in order to clear the history and the current DTCs.

DIAGNOSTIC AIDS
Most intermittent faults are caused by a faulty electrical connection or the wiring. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids for a detailed explanation of how to locate and repair intermittent conditions.

TEST DESCRIPTION

Steps 1-4:

The step number below refers to the step number in the Loss of VCM Class 2 Communications Diagnostic Table.
2. This test inspects for an intermittent condition.