For 1990-2009 cars

### Circuit Description

The calibrations for the instrument cluster are stored in EEPROM. When the ignition is first turned ON, the instrument cluster performs internal tests on the EEPROM and can determine the integrity of the EEPROM's non - volitale memory. A DTC 51 indicates that the EEPROM is either not programmed or an internal malfunction exists.

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. This step reprograms the instrument cluster using the scan tool.

2. If the programming procedure failed, check the power and ground circuits to the cluster. Replace the cluster if the power and ground circuits are good and you are still unable to program the cluster after numerous attempts.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Instrument Cluster Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster
2 |

1. Install the scan tool.
2. Select PROGRAMMING from the SPECIAL FUNCTIONS menu.
3. Follow the programming instructions on the display screen.

Was the programming successful?

--

Go to Diagnostic System Check - Instrument Cluster

Go to Step 3

3 |

1. Check power and ground circuits to the instrument cluster. Repair as needed.
2. If OK, replace the instrument cluster. Refer to Instrument Cluster Replacement.
3. Install the scan tool.
4. Select PROGRAMMING from the SPECIAL FUNCTIONS memu.
5. Follow the programming instructions on the display screen.

Is the replacement complete?

--

Go to Step 4

--

4 |

1. Install the scan tool.
2. Turn the ignition switch to the ON position.
3. Check for DTCs (current and history).
4. If any current DTCs are present, repair as needed.
5. If any history DTCs are present, clear the codes.

Did all DTCs clear from memory?

--

System OK

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