Cruise Control Function Test

Cruise control circuit function test is used to help determine if cruise control system is functioning properly when no trouble codes are present. To activate function test, turn ignition on. Push cruise control switch to SET/COAST position and hold. Set cruise ON-OFF (main) switch to ON position. Ensure CRUISE indicator light comes on and flashes after 3 seconds. Release cruise control switch from SET/COAST position. Activate each switch circuit in order given. Normal function code will be displayed by CRUISE indicator light, as each circuit is activated as follows:

1. SET/COAST
   
   Set cruise control switch to SET/COAST position and hold. If cruise control indicator light flashes 2 times (repeating), indicating a normal Code 2, set/coast circuit is okay. Go to next step. If cruise control indicator light does not flash 2 times (repeating), perform TEST 3 under TESTING & DIAGNOSIS. If TEST 3 results are okay, check CC ECU. See CRUISE CONTROL ECU CIRCUIT TESTING  under COMPONENT TESTING.
2. RES/ACC
   
   Set cruise control switch to RES/ACC position and hold. If cruise control indicator light flashes 3 times (repeating), indicating a normal Code 3, RES/ACCEL circuit is okay. Go to next step. If cruise control indicator light does not flash 3 times (repeating), see appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  and perform test(s) as indicated.
3. CANCEL Switches
   
   Observe cruise control indicator light and activate each cancel switch. Press CANCEL switch to ON and OFF positions. Depress and release brake pedal. Move shift lever from "D" to "N" position. If cruise control indicator light comes on when switch is in OFF position and goes off when switch is in ON position, circuit for that switch being activated is okay. Go to next step. If cruise control indicator does not function as indicated, see appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  and perform test(s) as indicated.
4. Vehicle Speed Sensor
   
   Raise vehicle and support vehicle with drive wheels off ground. Start engine and slowly depress accelerator pedal until vehicle speed is 25-30 MPH. Turn cruise ON-OFF switch to ON position. If cruise control indicator light flashes on and off every .25 second, go to next step. If cruise control indicator light does not flash on and off every .25 second, see appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  and perform test(s) as indicated.
5. Slow vehicle speed to 25 MPH or less. If cruise control indicator light comes on and stays on, vehicle speed sensor circuit is okay. Go to next step. If cruise control indicator light does not come on, see appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  and perform test(s) as indicated.
6. Cruise control function test is now complete. No problems are indicated at this time. If cruise control system still does not function properly and no trouble codes are present, see appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  and perform test(s) as indicated. Problem may be also be intermittent.