B1009

CIRCUIT DESCRIPTION
The EEPROM check sum error detection is handled inside the control module. No external circuits are involved.

CONDITIONS FOR RUNNING THE DTC
The microprocessor runs the program to detect a check sum error after each power up. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

ACTION TAKEN WHEN THE DTC SETS
The microprocessor reverts to base operation values programed for those blocks of data that have failed the check sum test. The blocks of data that have not failed the check sum test are not affected.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC clears when the malfunction is no longer present.
^ A history DTC clears when the module ignition cycle counter reaches the reset threshold without a repeat of the malfunction.

DIAGNOSTIC AIDS

IMPORTANT:
^ The DIM must be replaced if this DTC is retrieved from the DIM as either current or history. If this DTC is retrieved from any other module as a history DTC only do not replace the module.
^ The IPM must be recalibrated with the latest calibration before replacement. Refer to Body Control Module (BCM) Programming/RPO Configuration (DIM) or Body Control Module (BCM) Programming/RPO Configuration (IPM) or Body Control Module (BCM) Programming/RPO Configuration (RIM)
^ This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
^ If this DTC is retrieved as both a current and history DTC, replace the module.

TEST

Steps 1-6: