ABS indicator does not come on

ABS indicator does not come on
1. Turn the ignition switch ON (II), and watch the ABS indicator.
Does the ABS indicator come on for several seconds?
YES - The system is OK at this time.
NO - Go to step 2.
2. Apply the parking brake.
Does the brake system indicator come?
YES - Go to step 3.
NO - Repair open in the indicator power source circuit.
3. Turn the ignition switch OFF.
4. Substitute a known-good VSA modulator-control unit.
5. Turn the ignition switch ON (II).
Does ABS indicator come on?
YES - Replace the VSA modulator-control unit.
NO - Do the troubleshooting for the gauge control module.