Flash Code Diagnostics

Flash code diagnostics can only be used to read current diagnostic trouble codes and determine if history codes are present. Flash code diagnostics cannot be used to clear codes or read history codes. Flash code diagnosis is enabled by grounding terminal "K" of Assembly Line Diagnostic Link (ALDL) connector/Data Link Connector (DLC), located under instrument panel, with ignition switch in ON position. Grounding terminal "K" signals Diagnostic Energy Reserve Module (DERM) to enter flash code diagnostic display mode.

DERM identifies 2-digit trouble codes by activating INFLATABLE RESTRAINT indicator via a lamp driver at SIR indicator low output. Each code displayed will consist of a number of flashes representing tens for first digit, a 1/2-second pause, and a number of flashes representing ones for second digit. Each code is flashed once. After all codes have been displayed, entire code sequence will repeat until ground is removed from terminal "K" of ALDL/DLC connector.

Two special codes (Codes 12 and 13) exist when reading flash code mode. Code 12 will always be first code displayed when flash code mode is entered. Code 12 does not indicate a fault; it indicates flash code mode has been enabled. If no current or history codes are present, DERM will display Code 12 until ground is removed from ALDL/DLC connector at terminal "K". Code 13 will be displayed if history codes are present. To read history codes, use a scan tester.