Light Sequence Test Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1988 Cadillac Fleetwood, 1988 Cadillac DeVille, 1987 Cadillac Fleetwood, 1987 Cadillac DeVille, and 1986 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.
- Determine customer complaint as accurately as possible. If reduced braking ability is described, use caution in evaluating vehicle.
- Turn ignition off for a minimum of 15 seconds. Turn ignition on and observe "BRAKE" and "ANTI-LOCK" lights. If accumulator has been discharged, both lights may remain on for approximately 30 seconds. If this occurs, allow lights to turn off and turn ignition off for another 15 seconds. If lights do not go out within 30 seconds, proceed to step 5).
- Turn ignition on and observe warning lights. At this time, "BRAKE" light should remain off. "ANTI-LOCK" light should come on for 3 to 6 seconds and then go out.
- Turn ignition switch to "START" position and observe warning lights. Both warning lights should illuminate while ignition switch is in "START" position.
- When engine starts, release key to "RUN" position and observe warning lights. "BRAKE" light should turn off immediately. "ANTI-LOCK" light should remain on for 3 to 6 seconds and then go off.
- Drive vehicle at a minimum speed of 20 mph for a short period of time and observe warning lights. Both lights should remain off for this step and remainder of test. Note as accurately as possible the conditions under which either light comes on.
- Stop vehicle using a normal brake application. Both lights should remain off. Place transaxle in Park and allow vehicle to idle for a few seconds. Observe warning lights. Both should remain off.
- From information obtained in test above, determine light sequence and/or symptom which most closely matches behavior of complaint and perform indicated tests.