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"Set/Coast" Switch Test

  1. Turn ignition on. Place cruise engagement switch slider in "ON" position. Measure the voltage at the control module by probing pin L (circuit No. 84) and connecting the other lead of voltmeter to known good ground. If voltage present is 12 volts, go to step 2). If voltage is zero, go to step 4).
  2. Disconnect control module connector. Probe connector pin (circuit No. 84) to ground with voltmeter. If voltage is 12 volts, go to step 3). If voltage is zero, check for circuit No. 84 shorting to 12 volts in connector or a malfunctioning module connector. Repair or replace as necessary.
  3. Disconnect connector. Measure voltage at terminal D switch (circuit No. 84) connector side. If voltage is zero volts, check for short to 12 volts in wire. If voltage is 12 volts, check for short to 12 volts in connector. If there is no short, switch is malfunctioning. Repair or replace.
  4. If voltage in step 1) was zero volts, hold "SET/COAST" button switch in the depressed position and measure voltage at pin L (circuit No. 84) of control module. If voltage is 12 volts, switch is okay. If voltage is zero, disconnect connector.
  5. Measure voltage at terminal B (circuit No. 397) switch connector side. If voltage is zero, go to step 6). If voltage is 12 volts, hold "SET/COAST" button switch in the depressed position and measure voltage at terminal D switch side of connector. If voltage is zero volts, replace switch. If 12 volts, check terminal D (circuit No. 84) of connector to pin L at controller and find open. Repair or replace as required.
  6. Measure voltage at terminal A (circuit No. 39) harness connector side. If voltage is zero volts, find open in circuit No. 39 or blown fuse. If voltage is 12 volts, make sure slider switch was in "ON" position. If switch was in "ON" position and zero volts is obtained at terminal B (circuit No. 397) of connector side of the switch, replace switch. Repair as required.
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