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DTC 31: Brake Switch Circuit

WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to ON position. Depress brake pedal and observe brakelight operation. If brakelights do not illuminate, go to next step. If brakelights illuminate, go to step  6 .
  2. Inspect STOP (15-amp) fuse in instrument panel fuse box. If fuse is okay, go to next step. If fuse is blown, repair short to ground in brakelight system.
  3. Ensure STOP fuse is installed. Depress and hold brake pedal. Using a voltmeter, backprobe terminal 1B (Green/Yellow wire) at brake switch harness connector. If battery voltage exists, release brake pedal and go to step  5 . If battery voltage does not exist, release brake pedal and go to next step.
  4. Using a voltmeter, backprobe terminal 1A (Green wire) at brake switch harness connector. If battery voltage exists, replace brake switch. If battery voltage does not exist, repair wiring harness between instrument panel fuse box and brake switch.
  5. Depress and hold brake pedal. Using DVOM, measure voltage at brake light connector (Green/Yellow wire). See WIRING DIAGRAMS  . If battery voltage exists, check brakelight bulb and wiring harness between brakelight and ground. If battery voltage does not exist, repair wiring harness between brakelight switch and brakelight.
  6. Access cruise control module, located behind right kick panel. Depress and hold brake pedal. Using a DVOM, backprobe terminal "K" (Green/Yellow wire) at cruise control module harness connector. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair wiring harness between cruise control module and brake switch. See WIRING DIAGRAMS  .
  7. Disconnect cruise brake switch. Turn ignition switch to ON position. Press cruise control switch to ON position. Using a DVOM, measure voltage at cruise brake switch terminal 2B (Pink wire). If battery voltage exists, go to next step. If battery voltage does not exist, check cruise brake switch. See CRUISE BRAKE SWITCH  under COMPONENT TESTS.
  8. Turn ignition switch to LOCK position. Disconnect cruise control module. Turn ignition switch to ON position. Measure voltage at terminal "M" (Pink wire) at cruise control module harness connector. If voltage exists, repair wiring harness between cruise control module terminal "M" and cruise brake switch. See WIRING DIAGRAMS  . If no voltage exists, replace cruise control module.
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