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Brake Warning Indicator Inoperative

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
    NOTE: The brake warning indicator should illuminate during the bulb check cycle, and will also illuminate using the self test.
  1. Observe the brake warning indicator during the bulb check or instrument cluster self test. If the indicator illuminated, go to next step. If the indicator did not illuminate, go to step  8.
    2. NOTE: The brake warning indicator illuminates with the park brake engaged or with low brake fluid.
  2. If the brake warning indicator is inoperative with the use of the park brake, go to the next step. If the brake warning indicator is operative with the use of the park brake, go to step  5.
  3. Turn the ignition off. Disconnect the park brake switch harness connector. Connect a jumper wire between the brake warning indicator circuit and ground. Turn the ignition on and observe the brake warning indicator. If the indicator illuminated replace the park brake switch. If the indicator did not illuminate, go to the next step.
  4. Turn the ignition off. Disconnect the instrument cluster C1 harness connector. See Figure. Disconnect the park brake switch harness connector. Measure the resistance of the brake warning indicator circuit between the switch and the instrument cluster. If the resistance is below 5.0 ohms, replace the instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article. If the resistance is above 5.0 ohms, repair the brake warning indicator driver circuit between the park brake switch and the instrument cluster for an open.
  5. Turn the ignition on. With the DRBIII in MISCELLANEOUS ENGINE STATUS #1, read the brake low fluid reservoir switch state. Disconnect the brake warning indicator (fluid level) switch harness connector. Connect a jumper wire between cavity A and cavity B of the brake warning indicator switch harness connector. With the DRBIII, observe the brake low fluid input. If the brake low fluid input changed state, replace the brake warning indicator (fluid level) switch. If the brake low fluid input did not change state, go to the next step.
  6. Turn the ignition off. Disconnect the brake warning indicator (fluid level) switch harness connector. Measure the resistance of the brake warning indicator switch ground circuit. If the resistance is above 5.0 ohms, repair the brake warning indicator (fluid level) switch ground circuit for an open. If the resistance is below 5.0 ohms, go to the next step.
  7. Turn the ignition off. Disconnect the PCM C2 harness connector. See Figure. Disconnect the brake warning indicator (fluid level) switch harness connector. Measure the resistance of the Red brake warning indicator driver circuit between the switch and the PCM. If the resistance is above 5.0 ohms, repair the Red brake warning indicator driver circuit for an open. If the resistance is below 5.0 ohms, replace the powertrain control module. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION.
  8. Turn the ignition off. Remove the instrument cluster. Remove the inoperative indicator LED. Using a DVOM, select DIODE MODE, and attach the leads across the LED. Ensure that the Red lead is on the (+) of the LED. If the LED illuminated, replace the instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article. If the LED did not illuminate, replace the brake warning indicator LED. See INSTRUMENT CLUSTER BULBS & LED under REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article.
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