Speed Control Switches

NAME OF CODE
Speed Control Switches

WHEN MONITORED
With the ignition key on, and battery voltage greater than 10.4 volts.

SET CONDITION
When switch voltage is less than 4.5 volts for 2 minutes.

THEORY OF OPERATION
A single wire referenced to sensor return ground is used to sense steering wheel mounted switches. Each switch has an associated resistance valve. The switch resistance forms a voltage divider with the Powertrain Control Module's (PCM) internal pull up resistor to 5 volts. The resistor divider creates a unique voltage at the PCMs input pin thereby allowing multiple switches to be "multiplexed" on a single input.

POSSIBLE CAUSES
- Switch circuit shorted
- PCM failure
- Shorted S/C switch
- One or more switch stuck or held closed