Chart A2, Scan Tool History 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 IG fuse to SIR INDICATOR HIGH (B9) and to INFLATABLE RESTRAINT indicator light, which is connected to SIR INDICATOR LOW (A1). SIR fuse also applies system voltage to IGNITION 1 inputs A3 and B3. DERM responds by flashing INFLATABLE RESTRAINT indicator light 7 times.
When engine is 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 engine is cranked, 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
.
- Checks for intermittent shorts to system voltage in 36VLR wiring (circuit No. 236).
- Checks for intermittent shorts to ground in 36VLR wiring (circuit No. 236).
- Checks for intermittent open in 36VLR wiring (circuit No. 236).
- Checks for intermittent open in Force Hi and Force Low wiring (circuits No. 714 and 688).
- Checks for intermittent opens or shorts to ground in SENSE LOW wiring (circuit No. 752).
- Checks for shorts to system voltage in deployment loop (circuits No. 347 and 349) or in diagnostic circuits (circuits No. 347, 349, 688, 714, 752 and 753).
- Checks for shorts between circuits No. 236 and 347 or 349.