Chart B, Flash Code Diagnosis: Description
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.
When ignition switch is first turned on, system voltage is applied through METER fuse to SIR INDICATOR HIGH B9 and to INFLATABLE RESTRAINT indicator light, which is connected to SIR INDICATOR LOW A1. SIR fuse No. 3 also applies system voltage to IGNITION 1 inputs A3 and B3. DERM responds by flashing INFLATABLE RESTRAINT indicator light 7 times.
When engine is being cranked, system voltage is applied to DERM at CRANK input. DERM grounds lamp circuit until system voltage is removed from CRANK input. This results in a steady INFLATABLE RESTRAINT indicator light during cranking.
After cranking, DERM will again flash INFLATABLE RESTRAINT indicator light 7 times.
NOTE:
Test numbers refer to test numbers on diagnostic chart. For circuit number identification, see WIRING DIAGRAMS
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- If flash codes have been used to diagnose and repair a fault, code(s) diagnosed and repaired will appear as history code only. Only way to clear history codes is with a Scan tool.
- Where diagnostic charts request clearing of SIR codes, skip step since codes cannot be cleared through flash code diagnostics.