1998 Isuzu Oasis LSFACTORY OEM SERVICE PROCEDURE

Brake Switch Signal

NOTE: This signal informs PCM when brake pedal is depressed.
  1. If brake lights are on without depressing brake pedal, check brake light switch and repair or replace as necessary. If brake lights are not on, depress brake pedal. If brake lights come on, go to next step. If brake lights do not come on, check power feed circuit (including fuse) between brake light switch and fuse box. See WIRING DIAGRAMS article. Repair as necessary.
  2. Measure voltage between PCM connector terminals A32 and B20 (Accord, CR-V, Oasis & Odyssey) or terminals A9 and D5 (Civic & Prelude). See Figure . If battery voltage exists, brake switch signal is okay. If battery voltage does not exist, repair open in wire between PCM connector terminal B20 (Accord, CR-V, Oasis & Odyssey) or terminal D5 (Civic & Prelude) and brake light switch. See WIRING DIAGRAMS article.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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