Trouble Codes
WARNING: This page is about a different car, the 1991 Geo Storm, 1991 Geo Metro, 1990 Geo Storm, and 1990 Geo Metro. However, it is still accessible from the selected car via links, so may be relevant.
DERM provides a record of stored trouble codes according to type. Current codes are faults presently being detected. Current codes are stored in Random Access Memory (RAM) and are erased when fault is corrected. Current codes can be read by using flash code diagnostics provided through INFLATABLE RESTRAINT indicator light or a Scan tester such as Tech 1.