Measure the resistance between switch terminals when RESUME/ACCEL switch is pressed and not pressed.
Terminals
No. 2 — No. 3:
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?
Replace the ECM.
Replace the cruise control command switch.