Pinpoint Test C: The Cruise Control Switches Do Not Operate Correctly
Cruise Control
Pinpoint Test C: The Cruise Control Switches Do Not Operate Correctly
Normal Operation
The cruise control switches, which are integral to the LH steering wheel controls, use the Steering Column Control Module (SCCM) run/start voltage and the SCCM (Steering Column Control Module) ground. The cruise control functionality is controlled through the cruise control switches and is hardwired to the SCCM (Steering Column Control Module) through a signal and return circuit.
There are 4 cruise control switches with each switch operating a specific function that uses different resistance values. The SCCM (Steering Column Control Module) sends out a reference voltage to the cruise control switches and monitors the voltage drop when a cruise control switch is pressed. The voltage drop varies depending upon the resistance of each switch, providing a specific indication to the SCCM (Steering Column Control Module) of which switch is pressed. The SCCM (Steering Column Control Module) sends a network message to the PCM over the High Speed Controller Area Network (HS-CAN) relaying the switch status and requesting cruise control operation.
The PCM has cruise control deactivation event PIDs available, through the powertrain datalogger, that show what caused the cruise control deactivation during the current key cycle. Refer to Cruise Control Deactivation Event PIDs.
- B137F:09 (Steering Wheel Left Switch Pack: Component Failure)- a continuous and on-demand DTC that sets when one or more of the cruise control switches are stuck.
- B137F:11 (Steering Wheel Left Switch Pack: Circuit Short To Ground)- a continuous and on-demand DTC that sets when the cruise control switch circuits are shorted to ground.
- B137F:17 (Steering Wheel Left Switch Pack: Circuit Voltage Above Threshold)- a continuous and on-demand DTC that sets when the cruise control switch circuits are shorted to voltage.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Clockspring
- Cruise control switches (part of the LH steering wheel switch)
- SCCM (Steering Column Control Module)
PINPOINT TEST C : THE CRUISE CONTROL SWITCHES DO NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
C1 CHECK THE CRUISE CONTROL SWITCH
- Enter the following diagnostic mode on the scan tool: SCCM (Steering Column Control Module) DataLogger.
- Press each cruise control switch button while monitoring the cruise control switch PID (SCCS).
Cruise Control Switch SCCS PID Value- NONE Pressed CNCL/RSM RESUME/COAST ON/OFF Cruise Off or Cruise On SET + SET + SET - SET -
Does the PID value agree with the switch position?
Yes
GO to C5.
No
If only one switch does not display the correct PID value, INSTALL a new LH steering wheel switch. TEST the system for normal operation.
Otherwise, GO to C2.
C2 CHECK FOR VOLTAGE TO THE CRUISE CONTROL SWITCHES
- Ignition OFF.
- Disconnect: LH Steering Wheel Controls C2998.
- Ignition ON.
- Measure the voltage between the LH steering wheel switch C2998-5, harness side and the LH steering wheel switch C2998-3, harness side.
Is the voltage approximately 5 volts?
Yes
INSTALL a new LH steering wheel controls. CLEAR the DTCs. TEST the system for normal operation.
No
GO to C3.
C3 CHECK FOR VOLTAGE TO THE CLOCKSPRING
- Ignition OFF.
- Remove the driver air bag module.
- Disconnect: Clockspring C218B.
- Ignition ON.
- Measure the voltage between the clockspring connector C218B pin 7, component side and the clockspring C218B pin 15, component side.
Is the voltage approximately 5 volts present?
Yes
REPAIR the steering wheel harness or INSTALL a new steering wheel. INSTALL the driver air bag module. TEST the system for normal operation.
No
GO to C4.
C4 CHECK FOR VOLTAGE AT THE SCCM (Steering Column Control Module)
- Ignition OFF.
- Remove the clockspring.
- Ignition ON.
- Measure the voltage between the SCCM (Steering Column Control Module) C2414D-8, component side and the SCCM (Steering Column Control Module) C2414D-7, component side.
Is the voltage approximately 5 volts?
Yes
INSTALL a new clockspring. TEST the system for normal operation.
No
GO to C5.
C5 CHECK FOR CORRECT SCCM (Steering Column Control Module) OPERATION
- Disconnect all the SCCM (Steering Column Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SCCM (Steering Column Control Module) connectors and make sure they seat correctly.
- Connect: All Disconnected Connectors.
- Install the driver air bag module.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new SCCM (Steering Column Control Module). INSTALL the driver air bag module. CLEAR the DTCs. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.