SYSTEM SELF TEST
The RABS II module performs system tests and self-tests during start up and normal operation. The valve, sensor and fluid level circuits are monitored for proper operation. If a fault is found, the RABS II will be deactivated and the REAR ANTI-LOCK light will be lit until the ignition is turned off. When the light is lit, the diagnostic flashout code may be obtained. Under normal operation, the light will stay on for about 2 seconds while the ignition switch is in the ON position and will go out shortly after.
A flash code may be obtained only when the yellow light is ON. Before reading the code, drive the vehicle to a level area and place the shift lever in the PARK or NEUTRAL position. Keep the vehicle ignition ON.To obtain flash codes:
Verify that the ignition switch is in the RUN position (the engine does not need to be running).
- Locate the black RABS II diagnostic connector. The diagnostic connector has two mating halves (one of which has a black/orange wire connected to it).
Some models were built with locking terminals in the diagnostic connector. making it difficult to disconnect the two mating halves. Use the following procedure if the model is equipped with this particular type of connector:
- Lift the latch on the female housing to disengage the locking mechanism.
- Attempt to separate the two connector halves until the terminals lock.
- On the top portion of the connector housing, opposite from the mounting tabs, there is a small hole. Insert a narrow scribe tool into the hole until it stops.
- Separate the two connector housing halves by pushing the tool handle toward the black/orange wire.
- Attach one end of a jumper wire to the black with orange stripe wire side of the diagnostic connector. Momentarily ground the opposite end of the jumper wire by connecting it to a good chassis ground for 1-2 seconds.
- Grounding the wire thus should start the REAR ABS lamp flashing. If the light does not start flashing, perform the diagnostic tests.
- The code consists of a number of short flashes and ends with a long flash. Count the short flashes and include the following long flash in the count to obtain the code number. Example: three short and one long flash indicates a Code 4. The code will continue until the ignition is turned OFF.
DIAGNOSTIC FLOW CHARTS
The following pages contain diagnostic charts which may be used to help narrow a RABS II component or system failure.
See Figures 1 through 10