CRUISE CONTROL SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Detected when the main switch is pressed, or malfunction related to the main switch occurs.
TROUBLE SYMPTOM:
• Cruise control cannot be set. (Cancelled immediately.)
• Cruise control cannot be released.
WIRING DIAGRAM:

1.CHECK CRUISE CONTROL COMMAND SWITCH CIRCUIT.
1) Remove the driver’s airbag module. 
2) Disconnect the harness connector of cruise control command switch.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness connector terminal and chassis ground.
Connector & terminal
(ST3) No. 1 (+) — Chassis ground (−):
(ST3) No. 3 (+) — Chassis ground (−):
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Is the voltage 5 V or more?
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Check the harness between cruise control command switch and ECM for open or shorted circuit.
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2.CHECK CANCEL SWITCH.
1) Turn the ignition switch to OFF.
2) Remove the cruise control command switch. 
3) Measure the resistance between switch terminals when the CANCEL switch is pressed and not pressed.
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Is the resistance approx. less than 1 Ω when the CANCEL switch is pressed? Is the resistance approx. 4 kΩ when the CANCEL switch is not pressed?
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Replace the cruise control command switch. 
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3.CHECK SET/COAST SWITCH.
Measure the resistance between switch terminals when SET/COAST switch is pressed and not pressed.
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Is the resistance approx. 250 Ω when SET/COAST switch is pressed? Is the resistance approx. 4 kΩ when SET/COAST switch is not pressed?
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Replace the cruise control command switch. 
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4.CHECK RESUME/ACCEL SWITCH CIRCUIT.
Measure the resistance between switch terminals when RESUME/ACCEL switch is pressed and not pressed.
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Is the resistance approx. 1,500 Ω when RESUME/ACCEL switch is pressed? Is the resistance approx. 4 kΩ when RESUME/ACCEL switch is not pressed?
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Replace the cruise control command switch. 
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