Diagnostic Instructions
DTC Descriptor
DTC B1009: EEPROM Checksum Mismatch/Error
Circuit/System Description
The electrically erasable programmable read-only memory (EEPROM) check sum error detection is handled inside the control module.
Conditions for Running the DTC
The control module runs the program to detect an EEPROM checksum error after each wake-up. The only requirements are battery positive voltage and ground.
Conditions for Setting the DTC
The control module retains an inverse copy of the digital value stored in certain blocks of memory in the EEPROM. The control module then reads the information from those certain blocks and adds the stored inverse value to the current value. If they do
not equal 0, the module sets the DTC.
Action Taken When the DTC Sets
The control module reverts to base operation values programmed for those blocks of data that have failed the check sum test.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the control module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Reference Information
Schematic Reference
Data Communication Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
Scan Tool References
Control Module References
for scan tool information
Circuit/System Verification
- With a scan tool, clear the DTC.
| ⇒ | If the DTC will not clear, replace the module that set the DTC. |
- Ignition OFF, remove the scan tool, open and close the drivers door.
- Wait 60 seconds, verify DTC B1009 is not set.
| ⇒ | If the DTC is set, replace the module. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for control module replacement, setup, and programming
