Without Scan Tool

Flash DTC diagnostics can only be used to read current DTCs and to determine when history DTCs are present. Flash DTC diagnostics cannot be used to clear DTCs or read history DTCs. Flash DTC diagnostics is enabled by grounding data link connector (DLC) terminal K with the ignition switch ON. Grounding DLC terminal K pulls the DERM's "Diagnostic Request" input (terminal A5) low and signals the DERM to enter the flash DTC diagnostic display mode.

The DERM displays the DTCs by flashing the INFLATABLE RESTRAINT indicator with a lamp driver at the "SIR Indicator Low" output (terminal A1). Each DTC that is displayed consists of flashes which represent the tens, or first DTC digit; then a 1/2 second pause, followed by flashes which represent the ones or second DTC digit. Each DTC is flashed once before moving on to the next DTC. After all DTCs have been displayed, the entire DTC sequence is continually repeated until ground is removed from DLC terminal K.

Two special DTCs exist when reading in the flash DTC mode: flash DTC 12 and flash DTC 13. DTC 12 is always the first DTC displayed when the flash DTC mode is enabled. DTC 12 is not an SIR fault indication, but an indication that the flash DTC mode has been enabled. When there are no current or history DTCs present, the DERM displays DTC 12 until ground is removed from DLC terminal K. Flash DTC 13 displays only if there are history DTCs that are not current. To read history DTCs, a scan tool must be used.