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Test SP-9A - Testing Cruise Control Switch Circuits

  1. Inspect cruise control fuse. If fuse is okay, go to step 4). If fuse is blown, disconnect and inspect cruise control switch connector. If connector condition is not okay, repair connector as necessary and replace cruise control fuse. Perform TEST SP-VER  . If connector condition is okay, place DRB-II in ohmmeter mode. Probe terminal No. 1 (Yellow/Red wire) at cruise control switch connector.
  2. If resistance is more than 10 ohms, perform TEST SP-10A  . If resistance is less than 10 ohms, disconnect clockspring 5-pin connector. See Figure . Inspect connector. If connector condition is not okay, repair connector as necessary. Replace cruise control fuse. Perform TEST SP-VER  .
  3. If connector condition is okay, probe terminal No. 5 (White/Red wire) at clockspring connector. If resistance is more than 10 ohms, replace clockspring. Replace cruise control fuse. Perform TEST SP-VER  . If resistance is less than 10 ohms, repair short to ground in White/Red wire. Replace cruise control fuse. Perform TEST SP-VER  .
  4. If fuse is not blown in step 1), backprobe Yellow/Red wire at cruise control switch connector. If voltage is less than 10 volts, go to step 8). If voltage is more than 10 volts, turn ignition switch to OFF position. Disconnect Single Board Engine Controller (SBEC) connector. If connector condition is not okay, repair connector as necessary. If connector condition is okay, turn ignition switch to ON position.
  5. Place cruise control switch in ON position. Backprobe Brown/Red wire at cruise control switch connector. If voltage is less than 10 volts, perform TEST SP-9B  . If voltage is more than 10 volts, probe terminal No. 23 (Red/Light Green wire) at SBEC connector. If voltage is less than 10 volts, perform TEST SP-9C  . If voltage is more than 10 volts, disconnect cruise control switch.
  6. Inspect connector. If connector condition is not okay, repair connector as necessary. Perform TEST SP-VER  . If connector condition is okay, using an external ohmmeter, check resistance between terminals No. 1 and 4 at cruise control switch connector. See Figure .
  7. If resistance is not 5890-6510 ohms, replace cruise control switch. Perform TEST SP-VER  . If resistance is 5890-6510 ohms, replace SBEC. Perform TEST SP-VER  .
  8. If voltage is less than 10 volts at Yellow/Red wire in step 4), backprobe terminal No. 1 (White/Red wire) at clockspring connector. If voltage is more than 10 volts, replace clockspring. Perform TEST SP-VER  . If voltage is less than 10 volts, repair White/Red wire for an open to fuse panel. Perform TEST SP-VER  .
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