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Problem Symptoms Table

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - CRUISE CONTROL SYSTEM

Symptom Suspect Area
SET cannot be done and/or CANCEL cannot be done. (DTC is Normal)
  1. Input Signal Circuit
  2. Vehicle Speed Sensor Circuit
  3. Stop Light Switch Circuit
  4. Park/Neutral Position Switch Circuit
  5. ECM
SET cannot be done and/or CANCEL cannot be done. (DTC is not output)
  1. ECM
Actual vehicle speed deviates above or below the set speed.
  1. Input Signal Circuit
  2. ECM
Gear shifting occurs frequently between 3rd and O/D when driving on uphill road. (Hurting)
  1. ECM
Cruise control is not cancelled even when brake pedal is depressed.
  1. Stop Light Switch Circuit
  2. ECM
Cruise control not cancelled, even when transmission is shifted to "N" position.
  1. Park/Neutral Position Switch Circuit
  2. ECM
Control switch does not operate. (+/SET, +/RES, CANCEL not possible)
  1. Cruise Control Switch Circuit
  2. ECM
SET possible at 40 km/h (25 mph) or less, or CANCEL does not operate at 40 km/h (25 mph) or less.
  1. Input Signal Circuit
  2. ECM
Poor response is ACCEL and RESUME modes.
  1. ECM
O/D does not resume even though the road is not uphill.
  1. ECM
DTC memory is erased.
  1. ECM
DTC is not output, or is output when should not be.
  1. Diagnosis Circuit
  2. ECM
Cruise MAIN indicator light remains ON or fails to come on.
  1. Input Signal Circuit
  2. ECM
Cruise MAIN indicator light does not come on.
  1. Cruise MAIN indicator Light Circuit
  2. ECM
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