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Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

HINT:

Inspect each malfunction circuit in numerical order for the corresponding symptom.

If the malfunction still exist even after checking and confirming that all the circuit are normal, replace the ECM.

PROBLEM SYMPTOMS TABLE - DYNAMIC LASER CRUISE SYSTEM

Symptom Suspect Area
Main switch cannot be turned ON. (Cruise indicator light in combination meter does not come on.)
  1. Cruise control switch circuit
  2. Cruise main indicator light circuit
  3. ECM
Vehicle speed setting cannot be done. (Although indicator light in combination meter come on when the main switch is turned ON, it goes off when vehicle speed is set.)
  1. Cruise control switch circuit
  2. ECM
Setting cannot be done.
(Indicator light in combination meter come on when the main switch is turned ON and it remains ON while setting.)
  1. Cruise control switch circuit
  2. Stop lamp switch circuit
  3. Park/Neutral position switch circuit
  4. Combination meter system
  5. ECM
While the vehicle is driving with cruise control, the set control is canceled.
(Indicator light and CRUISE remain ON.)
  1. Cruise control switch circuit
  2. Vehicle speed sensor circuit
  3. Stop lamp switch circuit
  4. Cruise main indicator light circuit
  5. Park/Neutral position switch circuit
  6. ECM
Hunting (Speed is not constant.)
  1. Vehicle speed sensor circuit
  2. Malfunction in speedometer circuit
  3. Laser radar sensor circuit
  4. Distance control ECU circuit
  5. ECM
Setting cannot be cancelled.
(When Coast, Acceleration, Resume, Set speed change and Control switch are operated.)
  1. Cruise control switch circuit
  2. ECM
Erroneous detection or lost sight of the vehicle ahead.
  1. Clean laser radar sensor
  2. Improper aiming of laser sensor beam axis
Alarm buzzer does not sound.
  1. Buzzer circuit
  2. VSC system
  3. Laser radar sensor circuit
  4. Distance control ECU
  5. ECM
Set distance cannot be changed.
  1. Combination meter system
  2. Distance control switch
  3. ECM
No display.
  1. Combination meter system
  2. ECM
No brake control (when decelerating)
  1. ABS solenoid circuit
  2. VSC system
  3. Distance control ECU
  4. ECM
Constant speed mode cannot be ON.
  1. Cruise control switch circuit
  2. Wire harness
  3. ECM
  4. Combination meter system
Vehicle speed setting cannot be cancelled with wiper Lo/Hi. (Including automatic wiper)
  1. Rain sensor system
  2. Wiper system
  3. Distance control ECU
  4. ECM
Setting cannot be cancelled in SNOW mode.
  1. Pattern select switch circuit
  2. Automatic transmission system
  3. ECM
DIAGNOSTIC TROUBLE CODES (DTC) LIST

DTC Description
DTC P0500/21, P0503/23  VEHICLE SPEED SENSOR CIRCUIT "A" (INTERMITTENT/ERRATIC/HIGH)
DTC P0571/52  BRAKE SWITCH "A" CIRCUIT
DTC P0571/76  BRAKE SWITCH "A" CIRCUIT
DTC P0607/54  CONTROL MODULE PERFORMANCE
DTC P1570/73  LASER RADAR SENSOR MALFUNCTION
DTC P1572/75  IMPROPER AIMING OF LASER RADAR SENSOR BEAM AXIS
DTC P1575/66  WARNING BUZZER MALFUNCTION
DTC P1578/69  MALFUNCTION IN BRAKE SYSTEM
DTC P1615/61  COMMUNICATION ERROR FROM DISTANCE CONTROL ECU TO ECM
DTC P1616/62  COMMUNICATION ERROR FROM ECM TO DISTANCE CONTROL ECU
DTC U0100/65  LOST COMMUNICATION WITH ECM/PCM
DTC U0122/64  LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE
DTC U0235/71  COMMUNICATION ERROR FROM LASER RADAR SENSOR TO DISTANCE CONTROL ECU
DTC U0235/72  COMMUNICATION ERROR FROM DISTANCE CONTROL ECU TO LASER RADAR SENSOR
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