Corvette V8-5.7L VIN G (1997)
Body Control Module: Reading and Clearing Diagnostic Trouble Codes
Accessing and Reading Diagnostic Trouble Codes
The DTCs are read in only one of following two ways:
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Through the Instrument Panel Cluster (IPC).
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A scan tool.
Most all information in diagnostic tables will refer to the scan tool for diagnostic support. For details on using the IPC on-board diagnostic display
feature to access and/or clear DTCs. Refer to On-Board Diagnostic System. See: On-Board Diagnostic System
Clear any history DTC after a system malfunction is corrected in order to prevent future misdiagnosis.
Clearing Diagnostic Trouble Codes
Clearing DTCs
Disconnecting the battery or the IPC connectors will not clear a DTC. A DTC can only be cleared in one of the following three ways:
1. Using the IPC OBD feature.
2. Using a scan tool.
3. The PC will automatically clear a DTC if the malfunction has not occurred within 50 ignition cycles.
Most all information in diagnostic tables will refer to the scan tool for diagnostic support. For details on using the IPC on-board diagnostic display
feature to access and/or clear DTCs. Refer to On-Board Diagnostic System. See: On-Board Diagnostic System
Clear any history DTC after a system malfunction is corrected in order to prevent future misdiagnosi
On-Board Diagnostic System
This vehicle is equipped with a on-board diagnostic display feature capable displaying and/or clearing DTCs. By selecting specific buttons on the IPC,
DTCs are then displayed on the IPC's 20 character display unit. This feature allow DTCs to be read or cleared without the use a scan tool. When the
diagnostic mode is first entered, the IPC will enter into an automatic display sequence and will display all systems that communicate on the serial data
line. After each system is displayed, the IPC will display the number of DTC(s) (current or history) for that system. The manual diagnostic mode may be
selected at any time during the automatic DTC display sequence. In the manual diagnostic mode, you can manually select what module is going to be
displayed by pressing specific buttons on the DIC. In this mode, DTC(s) are only displayed for a specific module and will not proceed to the next until
requested. Both diagnostic mode displays will also indicates if the DTC is a current DTC (malfunction present now) or a history DTC (malfunction has
occurred, but is not present now) with a C or an H, respectively. Diagnostics will automatically be exited if no DIC buttons are pressed for longer than 60
seconds.
Entering On-board Diagnostics
To enter the Diagnostic Display function perform the following steps in order:
1. Turn ignition ON engine OFF
2. Press the RESET button to acknowledge any warning messages present.
3. Press the OPTIONS button on the Driver Information Center (DIC) and hold.
4. While holding the OPTIONS button press the FUEL button 4 times within a 10 second period.
5. System will enter automatic display mode.
Operating On-board Diagnostics
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Automatic - The automatic mode feature allow you to read each module DTC display function in an automatic display sequence. Each system
module DTC will be displayed for 3 seconds followed by a 1 second pause before the next DTC is displayed in an automatic sequence. If no
DTC information is sent to the IPC from the system currently displayed on the IPC, the IPC will display NO CODES for that system. At any
time during the automatic display function, the manual display feature can be activated by pressing any button on the DIC except the E/M 5
button. The E/M 5 button is used to completely exit the DIAGNOSTICS mode at any time. If there is a communications problem between any
system, the IPC will display NO COMM when the IPC is trying to communicate with that system. When all DTC(s) have been displayed for all
systems, the IPC will display NO MORE CODES for 2 seconds then will enter the manual display mode, waiting for manual mode operation.
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Manual- The manual display feature allows you to manually select each module DTC display function. The manual mode will automatically be
entered after the automatic DTC display sequence is complete, or can be entered at any time during the automatic mode by pressing any button
on the DIC except the E/M 5 (E/M 5 button is used to exit the DIAGNOSTIC mode at any time). When the manual mode is selected, the IPC
will display the MANUAL DIAGNOSTICS mode message for 2 seconds, or until any button on the DIC except the E/M 5 is pressed. After
the MANUAL DIAGNOSTICS mode message is displayed, the IPC will display the first system abbreviation and quantity of codes stored for
that system, then the IPC will wait for further instructions. To proceed to the next system in the list press the OPTIONS 4 button, and to go
backwards in the list press the TRIP 3 button. When a system is selected, each DTC for that system can be read by pressing the GAGES 2
button to move forward in the list, and the FUEL 1 button to move backwards in the list. If no DTC are present for the system currently
selected the IPC will display NO MORE CODES and then wait for further instructions. In both diagnostic modes, systems will be displayed in
the following order:
