Antilock Indicator Always On

Circuit Description
The instrument cluster controls the operation of the ANTILOCK indicator. The EBCM reports the desired status of the ANTILOCK indicator via class 2 serial data messages. The ANTILOCK indicator signal circuit is a back-up reporting circuit to the class 2 serial data messages. The EBCM supplies ground through the circuit when the ABS is operating properly. When there is a problem with ABS that should turn on the ANTILOCK indicator, the EBCM opens the ANTILOCK indicator signal circuit. If there is a problem with the ABS class 2 serial data messages, the instrument cluster uses the ANTILOCK indicator signal to determine if the ANTILOCK indicator should be illuminated. Using the serial data messages and back-up circuit, the instrument cluster decides whether to turn on the ANTILOCK indicator.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This test uses the scan tool to check the normal state of the ANTILOCK indicator control circuit.
4. This test ensures that the instrument cluster can operate the ANTILOCK indicator.