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Parking Brake Switch Circuit

NOTE: If LEXUS scan tool is available, start test from step  1. If this scan tool is not available, start test from step  2.
  1. Using scan tool, check parking brake switch using DATA LIST. If parking brake switch is faulty, go to next step. If parking brake switch is okay, go to next test listed in appropriate SYMPTOM DIAGNOSIS table under TROUBLE SHOOTING .
  2. Check parking brake switch. See PARKING BRAKE SWITCH  under COMPONENT TESTS. Replace parking brake switch as necessary. Retest system operation. If parking brake switch is okay, go to next step.
  3. Check circuits for faults between parking brake switch and body control ECU No. 1. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay, go to next test listed in appropriate SYMPTOM DIAGNOSIS table under TROUBLE SHOOTING .
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