VSA Activation Indicator Does Not Come On at Start-Up (Bulb Check)

VSA indicator does not come on
1. Turn the ignition switch ON (II), and watch the VSA indicator.
Does the VSA 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 on?
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 the VSA indicator come on?
YES - Replace the VSA modulator-control unit.
NO - Do the troubleshooting for the gauge control module.