C5 Corvette On-Board Diagnostics, Explained.

C5 Corvette On-Board Diagnostics, Explained.

The C5 Corvette is equipped with an on-board diagnostic display feature which is capable of displaying and/or clearing Diagnostic Trouble Codes (DTC). By selecting specific buttons on the driver information display switch, these codes can be displayed on the cluster’s 20 character display unit. This feature allows codes to be read or cleared without the use of a scan tool.

How to Enter the On-Board Diagnostics Mode

To enter the on-board diagnostic mode, perform the following steps in order:

  1. Turn ON the ignition switch while making sure the engine stays OFF.
  2. Press the RESET button to acknowledge any warning messages present.
  3. Press and hold down the OPTIONS button on the Driver Information Display Switch.
  4. While holding the OPTIONS button, press the FUEL button 4 times within a 5 second period.
  5. The System will first enter the automatic display mode described above followed by the manual display mode.

After entering into the diagnostic mode, the instrument panel cluster display will automatically show a sequence of all systems that communicate on the serial data line. After each system is displayed, the cluster will display the number of trouble codes (current or history) for each system.

In both automatic and manual diagnostic modes, the systems will be displayed in the following order:

  • PCM (Powertrain Control Module) 
  • TCS (Traction Control System) 
  • RTD (Real Time Damping) (with F45 option) 
  • BCM (Body Control Module) 
  • SDM (Sensing and Diagnostic Module) 
  • IPC (Instrument Panel Cluster) 
  • RADIO (Radio) 
  • HVAC (Heater, Ventilation and Air Conditioning) (with CJ2 option) 
  • LDCM (Left Door Control Module) 
  • RDCM (Right Door Control Module) 
  • SCM (Seat Control Module) (with AAB option) 
  • RFA (Remote Function Actuation)

Automatic Display Mode, Explained.

The automatic display feature is setup to display each system’s trouble code in an automatic sequence. Each code (DTC) will be displayed for 3 seconds followed by a 1 second pause before the next code is displayed. If no trouble code information is sent to the instrument cluster from the system currently being displayed, then NO CODES will be displayed for that system. If there is a communication problem between any system, the cluster will display NO COMM. Once all trouble codes have been displayed for all systems, the cluster will display NO MORE CODES for 2 seconds and will enter the manual diagnostic mode. After this, if no button is pushed within a 60 second interval the diagnostic mode will exit.

NOTE: At any time during the automatic display function, the manual diagnostic mode can be activated by pressing any button on the instrument cluster except the (5) E/M button. The (5) E/M button is used to completely exit the diagnostics mode.

Manual Display Mode, Explained.

The manual display feature allows manual selection and display of each system’s diagnostic trouble codes. When manual mode is first activated, the instrument cluster will display a MANUAL DIAGNOSTICS message for 2 seconds or until any button on the cluster (except the (5) E/M) is pressed. After this message is displayed, the cluster will show the first system abbreviation and quantity of codes stored for that system. It will then wait for further instructions.

NOTE: Both automatic and manual diagnostic modes will indicate if a trouble code is a present or previous malfunction trouble code. A “C” represents a present (currently happening) malfunction code. An “H” represents a previous (already happened, not currently happening) malfunction code.

The Driver Information Display Switch buttons provide the following functions when pressed while in manual display mode:

Driver Information Display ButtonButton Function
(1) FUELNavigates to the PREVIOUS Diagnostic Trouble Code (DTC)
(2) GAGESNavigates to the NEXT Diagnostic Trouble Code (DTC)
(3) TRIPNavigates to the PREVIOUS System
(4) OPTIONSNavigates to the NEXT System
(5) E/MEXITS the Diagnostics System
RESETClears the Diagnostic Trouble Codes (DTCs)
12135152, 10246860
C5 Driver Information Display Switch 1997-2004 Illustration
USED
$65.00

This part is a good, used C5 Driver Information Display Switch which can be installed on a 1997 to 2004 Corvette.

USED
$225.00$275.00

This part is a good, used C5 Instrument Cluster Assembly which can be installed on a 1997 to 2004 Corvette.

How to Clear Diagnostic Trouble Codes (DTCs)

To clear trouble codes, perform the following steps in order:

  1. Turn ON the ignition switch while making sure the engine stays OFF.
  2. Press the RESET button to acknowledge any warning messages present.
  3. Press and hold down the OPTIONS button on the Driver Information Display Switch.
  4. While holding the OPTIONS button press the FUEL button 4 times within a 10 second period.
  5. The instrument cluster will first enter automatic display mode followed by the manual display mode.
  6. Navigate to the desired system with trouble codes that you wish to clear by using the (4) OPTIONS button (Navigates to the NEXT System) or the (3) TRIP button (Navigates to the PREVIOUS System).
  7. Once the correct system is selected, press and hold the RESET button to clear the diagnostic trouble codes (DTCs).
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