Chart D, Inflatable Restraint Indicator Does Not Come On: 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 SIR fuse and IG fuse to DERM at SIR INDICATOR LOW, SIR INDICATOR HIGH and IGNITION 1 inputs. DERM responds by flashing INFLATABLE RESTRAINT indicator light 7 times with a lamp driver at SIR INDICATOR LOW input.
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 engine is cranked, DERM will again flash INFLATABLE RESTRAINT indicator light 7 times if ignition switch is on.
NOTE:
Test numbers refer to test numbers on diagnostic chart. For circuit number identification, see WIRING DIAGRAMS
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- Checks if high side (power side) of lamp circuit is good. This circuit powers a number of indicators within indicators (such as SERVICE ENGINE SOON and OIL indicators). If these other indicators are operative, power supply to INFLATABLE RESTRAINT indicator light is okay.
- When DERM is disconnected, shorting bar between terminals No. A1 and B1 of DERM harness connector should ground lamp circuit. If indicator does not illuminate, indicator circuit or shorting bar are suspect. If indicator comes on, DERM or SIR INDICATOR HIGH and IGNITION 1 circuits are suspect.
- Checks IG fuse which is in high side (power side) of lamp circuit.
- Checks for a short to ground in IG fuse circuits.
- Checks for system voltage at IGNITION 1 and SIR INDICATOR HIGH inputs at DERM.
- Checks if lamp circuit external to DERM is good.
- Checks if ground circuits to DERM are good.