Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Jeep >> 1993 >> Grand Cherokee Base, 4.0 S, AWD, AW4 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Self-Diagnostics >> Test SC-8A - Checking Cruise Control Switch Circuit

Test SC-8A - Checking Cruise Control Switch Circuit

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see appropriate chassis wiring diagram in the WIRING DIAGRAMS section.
  1. Inspect cruise control fuse. If fuse is okay, go to step 4). If fuse is open (NG), disconnect cruise control switch connector. Inspect connector and clean and repair as needed. Using DRB-II in ohmmeter mode, check cruise control ON/OFF switch sense circuit resistance at terminal No. 3 (White wire) of switch connector.
  2. If resistance is more than 5 ohms, go to TEST SC-9A  . If resistance is less than 5 ohms, disconnect clockspring. See Figure in TEST SC-2A  . Inspect connector and clean and repair as needed. Using DRB-II in ohmmeter mode, check ignition 12-volt feed circuit resistance at terminal No. 5 (White/Red wire) of clockspring connector.
  3. If resistance is more than 5 ohms, replace clockspring. Perform TEST SC-VER  . Replace cruise control fuse. If resistance is less than 5 ohms, repair short to ground in White/Red wire. Perform On XJ models, backprobe (with connector connected) cruise control resume switch sense circuit voltage at terminal No. 2 (White/Light Green wire) of cruise control switch connector using DRB-II in voltmeter mode. Hold down resume switch button. If voltage is less than 10 volts, replace cruise control switch. If voltage is more than 10 volts, release resume switch button.. Replace cruise control fuse.
  4. Using DRB-II in voltmeter mode, backprobe (with connector connected) ignition 12-volt feed circuit at terminal No. 1 (Yellow/Red wire) of cruise control switch connector. If voltage is more than 10 volts, go to step 6). If voltage is less than 10 volts, using DRB-II, backprobe (with connector connected) ignition 12-volt feed circuit at terminal No. 5 (White/Red wire) at clockspring connector.
  5. If voltage is more than 10 volts, replace clockspring. See Figure in TEST SC-2A. Perform TEST SC-VER  . If voltage is less than 10 volts, repair open in the White/Red wire to the fuse panel. Perform TEST SC-VER  .
  6. Turn ignition switch to OFF position. Disconnect PCM connector. Perform TEST SC-VER  . Turn ignition switch to ON position. Place cruise control ON/OFF switch in ON position. Using DRB-II in voltmeter mode, backprobe (with connector connected) cruise control mode select sense circuit voltage at No. 4 (Brown/Red wire) of switch connector.
  7. If voltage is less than 10 volts, go to TEST SC-8B  . If voltage is more than 10 volts, check cruise control mode select sense circuit voltage at terminal No. 23 (Red/Light Green wire) at PCM connector. If voltage is less than 10 volts, go to TEST SC-8C  .
  8. If voltage is more than 10 volts, disconnect cruise control switch connector. Using external ohmmeter, check resistance between cruise control switch connector terminal No. 1 (Yellow/Red wire) and terminal No. 4 (Brown/Red wire). If resistance is 5890-6510 ohms, replace PCM. Perform TEST SC-VER  . If resistance is not 5890-6510 ohms, replace cruise control switch. Perform TEST SC-VER  .
scientia non olet · About Mike's Workshop Manuals