Cruise Control Symptom Troubleshooting

NOTE:
  • The numbers in the table show the troubleshooting sequence.
  • Before troubleshooting.
    • check the No. 10 (7.5 A) and No. 4 (10 A) fuses in the under-dash fuse/relay box, and the No. 7 (15 A) fuse in the under-hood fuse/relay box.
    • check that the horn sounds.
    • check the tachometer to see if it works properly.

Symptom Diagnostic procedure Also check for 
Cruise control cannot be set 1.
2.
3.

4.

5.
6. 
Check main switch
Check SET/RESUME/CANCEL switch
Test brake pedal position switch and check its adjustment
Test clutch pedal position switch and check its adjustment (M/T)
Check transmission range switch (A/T)
Check control unit 
  • Poor ground:
    G101 (A/T), G501 (M/T)
  • Open circuit, loose or disconnected terminals:
    LT GRN, GRN/YEL, GRY/RED, BLU, WHT/GRN (A/T), LT BLU (M/T), BLU/WHT
 
Cruise control can be set, but indicator light does not go on 1.

2. 
Check cruise control indicator bulb in gauge assembly
Check control unit 
  • Poor ground:
    G501
  • Open circuit, loose or disconnected terminals:
    YEL, BLU/YEL
 
Cruise speed is noticeably higher or lower than what was set 1.
2.
3. 
Check Vehicle Speed Sensor (VSS)
Check actuator
Check control unit 
 
Excessive overshooting or undershooting when trying to set speed 1.
2.
3. 
Check actuator
Check Vehicle Speed Sensor (VSS)
Check control unit 
 
Speed fluctuation on a flat road with cruise control set 1.
2.
3. 
Check Vehicle Speed Sensor (VSS)
Check actuator
Check control unit 
 
Vehicle does not decelerate or accelerate accordingly when SET/RESUME/CANCEL button is pushed 1.
2. 
Check SET/RESUME/CANCEL switch
Check control unit 
Open circuit, loose or disconnected terminals:
GRY/RED,
LT GRN/BLK 
Set speed not cancelled (engine rpm stays high) when clutch pedal is pushed (M/T) 1.

2. 
Test clutch pedal position switch and check its adjustment
Check control unit 
Short to ground in the LT BLU wire 
Set speed not cancelled when shift lever is moved to Neutral position (A/T) 1.
2. 
Check transmission range switch
Check control unit 
Short to ground in the WHT/GRN wire 
Set speed not cancelled when brake pedal is pushed 1.

2. 
Test brake pedal position switch and check its adjustment
Check control unit 
Open circuit, loose or disconnected terminals:
WHT/BLK 

Symptom Diagnostic procedure Also check for 
Set speed does not cancel when main switch is pushed OFF 1.
2. 
Check main switch
Check control unit 
Short to power in the LT GRN wire. 
Set speed does not cancel when CANCEL button is pushed 1.
2. 
Check SET/RESUME/CANCEL switch
Check control unit 
Open circuit, loose or disconnected terminals:
GRY/RED,
LT GRN/BLK 
Set speed will not resume when RESUME button is pushed (with main switch on when set speed is temporarily cancelled by pressing the brake pedal) 1.
2. 
Check SET/RESUME/CANCEL switch
Check control unit 
Open circuit, loose or disconnected terminals:
LT GRN/BLK 
The transmission shifts down slower than normal when going up a hill with the cruise control on (A/T) 1. Troubleshoot the cruise control communication circuit Open circuit, loose or disconnected terminals:
BLU/ORN