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Cruise Control Unit Input Test

  1. Remove driver's side instrument panel lower cover and disconnect 14-pin connector from cruise control unit. See Figure . Inspect connector and control unit for damaged, loose, or corroded terminals. Repair as necessary, then test cruise control operation. If connectors and terminals are okay, go to next step.
  2. Turn ignition on. Check for battery voltage between ground and cruise control unit connector terminal No. 2 (Gray wire). See Figure . When brake pedal is depressed, zero volts should exist. When brake pedal is released, battery voltage should exist. If voltage is as specified, go to next step. If voltage is not as specified, check for defective brake switch. See BRAKE SWITCH  under COMPONENT TESTS. Check for open in Gray wire between brake switch and cruise control unit. See WIRING DIAGRAMS  .
  3. Ignition may be in any position. Check for continuity between ground and cruise control unit connector terminal No. 3 (Black wire). See Figure . If continuity exists, go to next step. If continuity does not exist, check for open in Black wire between cruise control unit and ground G401. See COMPONENT LOCATIONS  .
  4. Turn ignition on. Check voltage between ground and cruise control unit connector terminal No. 4 (Black/Yellow wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for blown fuse No. 6 (15-amp), located in driver's underdash fuse/relay box, or open in Black/Yellow wire between fuse No. 6 and cruise control unit. See WIRING DIAGRAMS  .
  5. Check for battery voltage between ground and cruise control unit connector terminal No. 5 (White/Black wire). See Figure . When brake pedal is depressed, battery voltage should exist. When brake pedal is released, zero volts should exist. If voltage is as specified, go to next step. If voltage is not as specified, check for defective brake switch, blown fuse No. 47 (20-amp), located in underhood fuse/relay box, or open in Black/Yellow wire between brake switch and cruise control unit.
  6. While depressing SET and CANCEL buttons, check voltage between ground and cruise control unit connector terminal No. 6 (Light Green/Red wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for blown fuse No. 47 (20-amp) located in underhood fuse/relay box, faulty horn relay, SET/RESUME/CANCEL switch, cable reel, or open in Light Green/Red wire between cable reel and cruise control unit. See WIRING DIAGRAMS  .
  7. While depressing RESUME and CANCEL buttons, check voltage between ground and cruise control unit connector terminal No. 7 (Light Green/Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for blown fuse No. 47 (20-amp), located in underhood fuse/relay box, faulty horn relay, SET/RESUME/CANCEL switch, cable reel, or open in Light Green/Black wire between cable reel and cruise control unit.
  8. Connect fused jumper wire between ground and cruise control harness connector terminal No. 11 (Brown/Black wire). Check operation of actuator motor by applying battery voltage to cruise control harness connector terminal No. 1 (Brown wire), then to terminal No. 9 (Red wire). See Figure . If actuator motor runs and throttle moves when both circuits are tested, go to next step. If not, check for open circuits in Brown, Brown/Black or Red wires. See WIRING DIAGRAMS  . Check ground G201. See COMPONENT LOCATIONS  . Repair as necessary. If circuit is okay, replace defective actuator.
  9. Turn ignition on. Connect a jumper wire between ground and cruise control harness connector terminal No. 10 (Blue/Black wire). If cruise indicator light comes on, go to next step. If cruise indicator light does not come on, check for blown fuse No. 9 (10-amp) located in underdash driver's fuse/relay box, blown indicator light bulb, or an open circuit in Blue/Black wire. See WIRING DIAGRAMS  . Check for defective dimming circuit in instrument cluster. See appropriate INSTRUMENT PANELS article.
  10. Using DVOM, backprobing, connect positive lead to cruise control unit terminal No. 12 (Blue/White wire). Connect DVOM negative lead to cruise control unit terminal No. 3 (Black wire). See Figure . Raise front of vehicle. Turn ignition on. Slowly rotate one wheel while blocking the other. Voltage should repeatedly fluctuate between zero volts and about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, check for an open circuit in Blue/White wire between PCM and cruise control unit. If circuit is okay, replace PCM.
    NOTE: Before replacing PCM, check if DTC P0720 is stored in PCM. If DTC P0720 is stored, see DTC P0720 (COUNTERSHAFT SPEED SENSOR)  under VEHICLE SPEED SENSOR SIGNAL under SYSTEM TESTS.
  11. Turn ignition switch and cruise control main switch on. Check voltage between ground and cruise control unit terminal No. 13 (Light Green wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for blown fuse No. 6 (15-amp), located in driver's underdash fuse/relay box, faulty cruise control main switch, or an open in Light Green wire between cruise control main switch and cruise control unit. See WIRING DIAGRAMS  .
  12. Turn ignition off. Check continuity between ground and cruise control unit terminal No. 14 (Light Blue wire) while moving shift lever to D3, D4 and D5 positions. If continuity exists in each specified position, go to next step. If continuity does not exist in each specified position, check for defective A/T gear position switch. See GEAR POSITION SWITCH TEST  . Check for open in Light Blue wire between gear position switch and cruise control unit, or poor ground G101. See COMPONENT LOCATIONS  .
  13. Reconnect cruise control unit connector. Start engine and turn cruise control main switch on. Backprobing, connect DVOM between ground and cruise control unit terminal No. 8 (Blue/Green wire). See Figure . Drive vehicle at least 25 MPH (40 km/h), set cruise control and check voltage. Voltage should be about one volt. If voltage is as specified, go to next step. If voltage is not as specified, check for short to ground in Blue/Green wire between cruise control unit and PCM. Repair as necessary. If Blue/Green wire is okay, replace cruise control unit.
  14. If any problems were found in previous steps, repair and retest system. If no problems were found, replace cruise control unit.
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