Switch Test Mode

Put system in Diagnostic Test Mode. Wait for code 55 to appear on DRB-II. Press "Read/Hold" key on DRB-II until "READ" is displayed. Turn on desired switch input. The DRB-II display must change between "00" and "88" and the check engine light should flash when the following switches are activated and released:

• Brake switch.
• Gearshift selector.
• A/C switch (if equipped).