Lamp Sequence Test

1. Turn the ignition switch to the "OFF" position for 15 seconds.
2. Turn the ignition switch to the "run" position. Observe the "BRAKE" and "ANTILOCK" lamps:
^ Both may light for approximately 30 seconds if the accumulator has been discharged. If this occurs, wait until both lamps turn OFF and repeat steps 1 and 2.
^ Both may light for more than 30 seconds. If this occurs, go to step 3.
^ The "ANTILOCK" lamp should light for 3 to 6 seconds and then turn OFF. The "BRAKE" lamp should not light (parking brake released). If this occurs, go to step 3.
3. Turn the ignition switch to the "start" position. Observe the "BRAKE" and "ANTILOCK" lamps. They should both be lit.
4. When the engine starts, release the ignition switch to the "run" position. Observe the "BRAKE" and "ANTILOCK" lamps:
^ The "BRAKE" lamp should turn OFF immediately.
^ The "ANTILOCK" lamp should light for 3 to 6 seconds and then turn OFF.
5. Drive the vehicle above 20 miles per hour for a short time. Observe the "BRAKE" and "ANTILOCK" lamps:
^ Both lamps should remain OFF.
^ Note the conditions related to either lamp lighting.
6. Stop the vehicle, using a normal brake application. Observe "BRAKE" and "ANTILOCK" lamps:
^ Both lamps should remain OFF.
^ Note the conditions related to either lamp lighting.
7. Allow the vehicle to idle for several seconds. Observe "BRAKE" and "ANTILOCK" lamps:
^ Both lamps should remain OFF.
^ Note the conditions related to either lamp lighting.

Fig. 1 Lamp Sequence - Normal Operation:

8. Park the vehicle. Compare the operation of "BRAKE" and "ANTILOCK" lamps to the chart in Figure 1.

Fig. 3 Lamp Sequence Chart:

9. If the lamp operation is not normal, use the chart in Figure 3 to identify lamp and brake system actions. Then use the appropriate component check charts to find the cause of the abnormal condition.