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Problem Symptoms Table

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - CRUISE CONTROL 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. Spiral cable
  3. Cruise main indicator light circuit
  4. ECM
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
  2. Spiral cable
  3. ECM
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
  2. Spiral cable
  3. Park/Neutral Position switch circuit 2JZ-GE:

    3UZ-FE:

  4. 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. Spiral cable
  3. Vehicle speed sensor circuit 2JZ GE:

    3UZ-FE:

  4. Stop light switch circuit
  5. Park/Neutral Position switch circuit 2JZ-GE:

    3UZ-FE:

  6. ECM
Hunting (Speed is not constant.)
  1. Vehicle speed sensor circuit 2JZ-GE:

    3UZ-FE:

  2. ECM
Setting cannot be cancelled.
(When Coast, Acceleration, Resume, Set speed change and Control switch are operated.)
  1. Cruise control switch circuit
  2. Spiral cable
  3. ECM