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Diagnostic Procedure

  1. Check Fuse  - Check 10A RELAYS fuse located in the interior fuse junction block. If fuse is okay, go to step  4. If fuse is not okay, go to next step.
  2. Check Electrical System  - With ignition off, replace blown fuse. Turn ignition on. If the fuse blows again, go to next step. If the fuse does not blow again, go to step  4.
  3. Check For Short To Ground  - Turn ignition off. Remove RELAYS fuse. Locate and disconnect Speed Control Disengage/BOO switch connector. Using DVOM, measure and record resistance between RELAY fuse holder terminal and ground. If resistance is more than 10 k/ohms, reinstall fuse and go to next step. If resistance is less than 10 k/ohms, repair short in Blue wire between fuse panel Speed Control Disengage/BOO switch. Reconnect all connectors. Install gearshift lever, console and knob.
  4. Check Shift Lock Actuator Ground  - Ensure gearshift lever is in "P" position. Using DVOM, measure resistance between shift lock actuator connector Black wire and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black wire between shift lock actuator and ground. See WIRING DIAGRAMS .
  5. Check Supply Voltage To Shift Lock Actuator  - Turn ignition on. Using DVOM, measure voltage between shift lock actuator wiring harness connector White wire and ground. If voltage is more than 10 volts, replace shift lock actuator. If voltage is less than 10 volts, repair open in White wire.
  6. Check Speed Control Disengage/BOO Switch  - Turn ignition off. Disconnect BOO switch connector. Using DVOM, measure and record resistance between BOO switch connector terminals. Depress brake pedal and measure resistance of BOO switch terminals again. Resistance should be less than 5 ohms with brake pedal depressed and more than 10 k/ohms with brake pedal released. If resistance is as specified, repair open White wire between BOO switch and shift lock actuator. If resistance is not as specified, replace Speed Control Disengage/BOO switch. Reconnect all connectors and retest system.
  7. Check Stoplight Operation  - If stoplights operate when brake pedal is depressed, repair open Green wire between BOO switch and shift lock actuator. If stoplights do not operate when brake pedal is depressed, diagnose problem in stoplight circuit. See appropriate EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
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