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You could have a faulty speedometer/odometer combination meter causing a false Vehicle Speed Sensor error.
My 1998 Sienna had the following symptoms:
- Speedometer and odometer failed intermittently
- The check engine light would come on and I would get a p0500 code in the OBDII.
- The cruise control would stop working at the same time the speedometer failed.
There is a speed sensor in each one of the tires and they feed the speed information to the ABS ECU. From the ABS ECU the speed signal goes to the speedometer/odometer combination meter, and from there it goes to the Engine Control Module and to the Cruise Control ECU. I could see a signal coming into the speedometer/odometer, but no signal going out. Replacing the speedometer/odometer combination meter fixed the problem.
no year stated, wow. the first checks are not the CRUISE. they are: 1: all fuses good. 2: CEL lamp out driving, if not the PCM will in fact cut Cruise function ( preventing TOYOTA SYNDROME) 3: scan tool do a full PCM scan, got errors. got DTCs, bingo.
today cruise is the last to work, (a very serious safety issue)
Once you have turned your cruise control on accelerate to desired speed press SET button on right hand side of steering wheel before lifting foot from accelerator, then remove foot from accelerator. pushing RESUME button will deactivate cruise control without turning it off. Then when clear of traffic push resume again to activate cruise control. It will automatically resume to previous set speed.
If the cruise control makes the engine seem to run very rough until disengaging it, there could be a problem with the engine itself. As, most cruise control systems just pull on the throttle cable to maintain speed on the highway based on setting the speed with the button.
So, I would look into the engine maybe having an issue with spark plugs, or wires, or another tuneup or mechanical issue.
The Dashboard light dimmer control is probably stopped working because one of the tiny eletronic bits inside it has died. A temporary fix is to remove the connecting plug on the rear of the unit and put a bridging wire across the terminals. The cruise control problem could have several causes. They operate on engine vacuum so check the hose going to the cruise control unit in the engin bay from the inlet manifold. If the hose is cracked or hard there will not be enough vacuum to operate the cruise control.