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Home >> Oldsmobile >> 1997 >> Eighty-Eight Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Cruise Control System) >> Testing >> Cruise Control Is Inoperative
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Cruise Control Is Inoperative

WARNING: This page is about a different car, the 1997 Oldsmobile Aurora and 1997 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
  1. To avoid misdiagnosis, perform the following before proceeding with test: Perform Rev Test. See REV TEST. Verify proper operation of brakes and center high mounted stoplight. Check throttle linkage for binding. Check for stored DTCs. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section. Refer to menu below.
  2. Turn main switch to OFF position. Disconnect cruise control module. Turn ignition switch to RUN position. Connect a test light between cruise control module connector terminal "F" (Brown wire) and ground. If test light glows, go to next step. If test light does not glow, repair poor connection or open in Brown wire.
  3. Connect test light between cruise control module connector terminals "F" (Brown wire) and "E" (Black wire). If test light glows, go to next step. If test light does not glow, repair poor connection or open in Black wire.
  4. Move main switch to ON position. Connect test light between cruise control module connector terminals "A" (Gray wire) and "E" (Black wire). If test light glows, go to next step. If test light does not glow, check Gray wire between cruise control module connector and multifunction lever for a short to ground, poor connection or open. If wire is okay, replace multifunction lever. See STEERING COLUMN SWITCHES article.
  5. Connect test light between cruise control module connector terminals "B" (Dark Blue wire) and "E" (Black wire). Press and hold SET button. If test light glows, go to next step. If test light does not glow, check Dark Blue wire between cruise control module connector and multifunction lever for a short to ground, poor connection or open. If wire is okay, replace multifunction lever. See STEERING COLUMN SWITCHES article.
  6. Connect test light between cruise control module connector terminals "C" (Gray/Black wire) and "E" (Black wire). Press and hold SET button. If test light does not glow, go to next step. If test light glows, check circuit No. 87 (Gray/Black wire) for a short to circuit No. 84 (Dark Blue wire) between cruise control module connector and multifunction lever. If wire is okay, replace multifunction lever. See STEERING COLUMN SWITCHES article.
  7. Connect test light between cruise control module connector terminals "D" (Purple wire) and "E" (Black wire). If test light glows, go tostep 9). If test light does not glow, go to next step.
  8. Using test light, backprobe between TCC brake switch connector C1, terminal "B" (Purple wire) and ground. TCC brake switch is located on brake pedal. If test light glows, repair poor connection or open in Purple wire. If test light does not glow, check for poor connection or open in Pink wire between TCC brake switch and fuse block. Ensure TCC brake switch is aligned correctly in 3 o'clock position. If wires and alignment are okay, replace TCC brake switch. See TCC BRAKE SWITCH under REMOVAL & INSTALLATION  .
  9. Set parking brake. Raise drive wheels. Using Digital Voltmeter/Ohmmeter (DVOM), check voltage between cruise control module connector terminal "K" (Dark Green/White wire) and ground. While observing DVOM, rotate drive wheels by hand. If voltage varies, go to next step. If voltage does not vary, check for poor connection or open in Dark Green/White wire.
  10. Turn ignition off. Check for a poor connection or open in Dark Green wire between cruise control module and PCM. Reinstall cruise control module. Install scan tool. Start engine and clear any DTCs that may be present. Attempt to operate vehicle in cruise control. If SMCC INHIBITED is not displayed on scan tool, go to next step. If SMCC INHIBITED is displayed on scan tool, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section. Refer to menu below.
  11. Clear any DTCs that may be present. Using scan tool, command SMCC to ALLOW CRUISE. Using DVOM, check voltage between cruise control module connector terminal "H" (Dark Green wire) and battery voltage. If battery voltage exists, replace cruise control module. If battery voltage does not exist, check for a short to power in Dark Green wire. If wire is okay, check PCM. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section. Refer to menu below.
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