P1593-2A

P1593-2A-SPEED CONTROL SWITCH 1/2 STUCK

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Right Steering Wheel Control Switch (Speed Control Switch) includes the cruise control functions. Cruise Control Functions are resistor multiplexed and are hard wired inputs to the Steering Angle Sensor (SAS) microprocessor. The switch also contains the circuitry of a Local Interface Network (LIN) slave node, which provides source current for and communicates the switch or sensor states of the Electronic Vehicle Information Center (EVIC) switches, the remote radio switches and the horn switch over the LIN data bus to the SAS, which is also the LIN master node and a gateway to the Controller Area Network (CAN) data bus. Speed Control Switch - Operation.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
Fault signifies any Speed Control Switch is held/stuck for greater than 120 seconds.





CHECK FOR AN ACTIVE DTC

NOTE: Before proceeding with the diagnostic procedure, verify that the connections are properly made, seated and verify proper pin terminal tension. A loose connection at any of the SCCM connectors may cause the DTC to set.

1. Turn the ignition on.
2. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Replace the Right Steering Wheel Switch (Speed Control Switch). Speed Control Switch - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- If the vehicle is being serviced for a cruise control related concern and this DTC is stored, replace the Right Steering Wheel Switch (Speed Control Switch). Speed Control Switch - Removal.
- If the DTC is stored: Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.