For 1990-2009 cars

### 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 module runs the program in order 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 module 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

• | This DTC may be stored as a history DTC with out 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.

Step | Action | Yes | No
--- | --- | --- | ---
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | Go to Step 2 | Go to Control Module References for the applicable Diagnostic System Check
2 | Is the module the body control module (BCM)? | Go to Step 3 | Go to Step 4
3 |

1. Reprogram the module in which the DTC is set. Refer to Body Control Module (BCM) Programming/RPO Configuration .
2. Complete the recalibration procedure.
3. Use the scan tool in order to clear the DTCs.
4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 5

System OK

4 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF
3. Retrieve DTCs

Is DTC retrieved as a current DTC?

Go to Step 5

Go to Diagnostic Aids

5 | Important: Perform the module setup procedure if required. Replace the module. Refer to Control Module References . Did you complete the replacement? | Go to Step 6 | --
6 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK