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Problem Symptoms Table

WARNING: This page is about a different car, the 2005 Lexus RX 330. 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 related troubleshooting information.

SYMPTOMS

Symptom Suspect Area Refer To
Main switch cannot be turned ON.
(Cruise indicator light in combination meter is not lit.)
  1. Cruise control switch circuit
  2. CRUISE MAIN indicator light circuit
  3. ECM
  1. CRUISE CONTROL SWITCH CIRCUIT 
  2. CRUISE MAIN INDICATOR LIGHT CIRCUIT 
  3. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Vehicle speed setting cannot be done.
(Although indicator light in combination meter is lit when the main switch is turned ON, they go off when vehicle speed is set.)
  1. Cruise control switch circuit
  2. ECM
  1. CRUISE CONTROL SWITCH CIRCUIT 
  2. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Setting cannot be done.
(Indicator light in combination meter is lit when the main switch is turned ON and they remain ON while setting.)
  1. Cruise control switch circuit
  2. Stop lamp switch circuit
  3. PNP switch circuit
  4. Combination meter system
  5. ECM
  1. CRUISE CONTROL SWITCH CIRCUIT 
  2. DTC P0571/52: BRAKE SWITCH "A" CIRCUIT 
  3. DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)
  4. PROBLEM SYMPTOMS TABLE
  5. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
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. PNP switch circuit
  6. ECM
  1. CRUISE CONTROL SWITCH CIRCUIT 
  2. DTC P0500/21: VEHICLE SPEED SENSOR "A", DTC P0503/23 VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH 
  3. DTC P0571/52: BRAKE SWITCH "A" CIRCUIT 
  4. CRUISE MAIN INDICATOR LIGHT CIRCUIT 
  5. DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)
  6. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Hunting
(Speed is not constant.)
  1. Vehicle speed sensor circuit
  2. ECM
  1. DTC P0500/21: VEHICLE SPEED SENSOR "A", DTC P0503/23 VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH 
  2. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
Setting cannot be cancelled. (When Coast, Acceleration, Resume, Set speed change and Control switch are operated.)
  1. Cruise control switch circuit
  2. ECM
  1. CRUISE CONTROL SWITCH CIRCUIT 
  2. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
DTC is not output, or is output when should not be.
  1. Diagnosis circuit
  2. ECM
  1. DIAGNOSIS CIRCUIT 
  2. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
CRUISE MAIN indicator light does not come on.
  1. Cruise control switch circuit
  2. CRUISE MAIN indicator light circuit
  3. ECM
  4. Combination meter assy
  1. CRUISE CONTROL SWITCH CIRCUIT 
  2. CRUISE MAIN INDICATOR LIGHT CIRCUIT 
  3. ELECTRONIC CIRCUIT INSPECTION PROCEDURE
  4. PROBLEM SYMPTOMS TABLE