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DTC P1596-B: Speed Control Switch Always High

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Condition to set trouble code is not present at this time. SPEED CONTROL SWITCH ALWAYS HIGH DTC sets when an open is detected in speed control ON/OFF switch circuit. Possible causes are: speed control switch shorted to power, speed control switch open circuit, open ON/OFF switch or PCM failure. Go to next step.
  2. Using scan tool, observe speed control ON/OFF switch voltage. Wiggle wiring harness between speed control ON/OFF switch to PCM. If wiggling did not cause voltage to go to more than 4.9 volts at any time, problem is not present at this time. Perform TEST VER-4A: SPEED CONTROL VERIFICATION . If wiggling caused voltage to go to more than 4.9 volts at any time, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-4A: SPEED CONTROL VERIFICATION .
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