Problem Symptoms Table
If a normal system code is displayed during the DTC check but the problem still occurs, check the suspected areas for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting information.
HINT:
Inspect the "Fuse" and "Relay" before confirming the suspected areas as shown in the chart below. Inspect each suspected area for the corresponding symptom in numerical order.
DYNAMIC LASER CRUISE CONTROL SYSTEM
PROBLEM SYMPTOMS CHART
| Symptom | Suspected area | See |
|---|---|---|
| Main switch cannot be turned ON. (Cruise indicator light in combination meter does not come on.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. CRUISE main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 3. ECM | TERMINALS OF ECU | |
| Vehicle speed setting cannot be done. (Although indicator light in combination meter comes on when the main switch is turned ON, it goes off when vehicle speed is set.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | TERMINALS OF ECU | |
| Setting cannot be done. (Indicator light in combination meter comes on when the main switch is turned ON and it remains ON while setting.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| 3. Park/Neutral position switch circuit (DTC P0705) | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 4. Transmission control switch circuit | TRANSMISSION CONTROL SWITCH CIRCUIT | |
| 5. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 6. ECM | TERMINALS OF ECU | |
| While the vehicle is driven with cruise control, the set control is cancelled. (Indicator light and CRUISE remain ON.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION; DTC P0503 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION | |
| 3. Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| 4. Cruise main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 5. Park/Neutral position switch circuit (DTC P0705) | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 6. ECM | TERMINALS OF ECU | |
| Hunting (Speed is not constant.) | 1. Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION; DTC P0503 VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION |
| 2. Malfunction in speed meter circuit | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Laser sensor power source circuit | LASER SENSOR POWER SOURCE CIRCUIT | |
| 4. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 5. Distance control ECU | TERMINALS OF ECU | |
| 6. ECM | TERMINALS OF ECU | |
| Setting cannot be cancelled. (When Coast, Acceleration, Resume, Set speed change and Control switch are operated.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | TERMINALS OF ECU | |
| Erroneous detection or lost sight of the vehicle ahead. | 1. Clean laser sensor with soft cloth, etc. | LASER SENSOR |
| 2. Improper aiming of sensor beam axis | LASER SENSOR | |
| Alarm buzzer does not sound. | 1. Buzzer circuit | SKID CONTROL BUZZER CIRCUIT |
| 2. VSC system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Laser sensor power source circuit | LASER SENSOR POWER SOURCE CIRCUIT | |
| 4. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 5. Distance control ECU | TERMINALS OF ECU | |
| 6. ECM | TERMINALS OF ECU | |
| Set distance cannot be changed. | 1. Combination meter system | SYSTEM DESCRIPTION |
| 2. Distance control switch circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 3. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT | |
| 4. ECM | TERMINALS OF ECU | |
| No display | 1. Combination meter system | SYSTEM DESCRIPTION |
| 2. ECM | TERMINALS OF ECU | |
| No brake control (when decelerating) | 1. VSC system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 3. Distance control ECU | TERMINALS OF ECU | |
| 4. ECM | TERMINALS OF ECU | |
| Constant speed mode cannot be turned on. | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Combination meter system | SYSTEM DESCRIPTION | |
| 3. ECM | TERMINALS OF ECU | |
| Vehicle speed setting cannot be cancelled with wiper LO/HI. (Including automatic wiper) | 1. Rain sensor circuit | DTC B1279 RAIN SENSOR COMMUNICATION STOP |
| 2. Wiper switch circuit | WIPER SIGNAL CIRCUIT | |
| 3. Distance control ECU | TERMINALS OF ECU | |
| 4. ECM | TERMINALS OF ECU | |
| Unable to adjust (complete) beam axis of millimeter wave radar sensor. | 1. Check for DTC P1570 | DTC P1570 RADAR SENSOR MALFUNCTION |
| 2. Check position, distance and angle of reflector | LASER SENSOR | |
| 3. Check installation of laser sensor | LASER SENSOR | |
| 4. Laser sensor | LASER SENSOR POWER SOURCE CIRCUIT | |
| 5. ECM | TERMINALS OF ECU |