Cruise Control Symptom Troubleshooting

Symptom | Diagnostic procedure | Also check for
--- | --- | ---
Cruise control cannot be set | 1. 2. 3. 4. 5.
6.
Check horn operation.
Check the cruise control combination switch.
Test the brake pedal position switch and check its adjustment.
M/T model: Test the clutch pedal position switch and check its adjustment.
Do the cruise control unit input test.
Check for continuity between engine control module (ECM)/powertrain control module (PCM) connector terminal E26 and cruise control unit 14P connector terminal No. 12.

- If there is continuity, replace the ECM/PCM.
- If there is no continuity, repair open or short in the wire.

- Blown No. 13 (20 A) fuse in the under-hood fuse/relay box
- Blown No. 18 (15 A) fuse in the under-dash fuse/relay box
- Poor ground: G202, G506
- Faulty horn relay
- Faulty security horn relay
- Faulty ECM/PCM
- Open circuit, loose or disconnected terminals: GRN/YEL, GRN, RED, GRN (LHD), LT GRN (RHD), PNK, GRY (LHD), BLK/RED (RHD), BLU, BLK, LT BLU (M/T), PNK (A/T)

Cruise control can be set, but the CRUISE MAIN indicator does not come on | Do the gauge control module self-diagnostic function procedure. |

- Faulty gauge control module
- Open circuit, loose or disconnected terminals: GRN (LHD), LT GRN (RHD)

Cruise control can be set, but the CRUISE CONTROL indicator does not come on | 1. 2. | Do the gauge control module self-diagnostic function procedure. Do the cruise control unit input test on pin No. 10. |

- Faulty gauge control module
- Open circuit, loose or disconnected terminals: BLU
- Poor ground: G506

Cruise speed is noticeably higher or lower than what was set | 1. 2. 3. | Check the cruise control actuator. Adjust the cruise control cable. Do the cruise control unit input test on pin No. 12. |
Excessive overshooting or undershooting when trying to set speed | 1. 2. 3. | Check the cruise control actuator. Adjust the cruise control cable. Do the cruise control unit input test on pin No. 12. |
Speed fluctuation on a flat road with the cruise control set | 1. 2. 3. | Check the cruise control actuator. Adjust the cruise control cable. Do the cruise control unit input test on pin No. 12. |
Vehicle does not decelerate or accelerate accordingly when the DECEL/SET or RES/ACCEL button is pressed | 1. 2. | Check the cruise control combination switch. Do the cruise control unit input test on pins No. 6 and No. 7. | Open circuit, loose or disconnected terminals: GRY, LT GRN
Set speed does not cancel (engine rpm stays high) when the clutch pedal is pressed | 1. 2. | Do the cruise control unit input test on pin No. 14. Test the clutch pedal position switch and check its adjustment. |

- Short to ground in the LT BLU wire
- Faulty clutch pedal position switch

Set speed does not cancel when the shift lever is move to N | Do the cruise control unit input test on pin No. 14. |

- Short to ground in the PNK wire
- Faulty transmission range switch

Set speed does not cancel when the brake pedal is pressed | 1. 2. | Do the cruise control unit input test on pins No. 1 and No. 5. Test the brake pedal position switch and check its adjustment. |

- Short to power on BRN wire
- Open circuit, loose or disconnected terminals: WHT/BLK
- Faulty brake pedal position switch

Set speed does not cancel when the cruise control master button is pressed | 1. 2. | Check the cruise control combination switch. Do the cruise control unit input test on pin No. 2. | Short to power on GRY (LHD), LT GRN (RHD) wire
Set speed does not cancel when the CANCEL button is pressed | 1. 2. | Check the cruise control combination switch. Do the cruise control unit input test on pins No. 6 and No. 7. | Open circuit, loose or disconnected terminals: GRY, LT GRN
Set speed will not resume when the RES/ACCEL button is pressed (with the cruise control master button turned on and set speed temporarily canceled by pressing the brake pedal) | 1. 2. | Check the cruise control combination switch. Do the cruise control unit input test on pins No. 1, No. 5 and No. 7. | Open circuit, loose or disconnected terminals: WHT/BLK, LT GRN
Set speed will not resume when the RES/ACCEL button is pressed (with the cruise control master button turned on and set speed temporarily canceled by pressing the clutch pedal) | 1. 2. | Check the cruise control combination switch. Do the cruise control unit input test on pins No. 7 and No. 14. | Open circuit, loose or disconnected terminals: LT GRN, LT BLU
The transmission shifts down slower than normal when going up hill with the cruise control on | Troubleshoot the cruise control communication circuit. | Open circuit, loose or disconnected terminals: ORN (LHD), BLU (RHD)