Warning Lamp Does Not Light

Warning lamp should light up when ignition is turned On. If should also go out after 10 seconds or when the engine is started. The warning lamp is connected to a circuit board housed in the instrument panel which switches the lamp on and off. It is always turned on when the ignition is On. After the circuit test has been carried out the crash sensor lowers the voltage to approximately 1.5 volts across the circuit which in turn switches the lamp off.
The voltage across the lamp is approximately 8.5 volts when lit. It is this voltage which can be measured at the test connection. Refer to ELECTRICAL AND ELECTRONIC DIAGRAMS for wiring diagram. Turn ignition On, then check voltage across test connection and ground. Check measurement for first 10 seconds as follows:
1. If voltage is approximately 8.5 volts, ensure lamp is not blown.
2. If lamp is satisfactory, install new circuit.
3. If voltage is approximately 1.5 volts, crash sensor may be defective.
4. If crash sensor is defective, separate yellow connector, then turn ignition On again.
5. If lamp comes on, sensor is defective.
6. If voltage reads zero, circuit is short circuited to ground. Checks all leads and connectors.
7. If voltages are not as specified above, replace circuit board in instrument panel.