B1490

B1490-STEERING WHEEL CONTROL C/T SWITCH CIRCUIT





For a complete wiring diagrams, refer to Wiring.

Theory of Operation
The Steering Wheel Control Compass/Temperature Switch is part of the Right Steering Switch. The switching status is transferred to the Steering Column Control Module (SCCM) by way of the LIN bus, a serial sub-bus. The SCCM converts the data to CAN(B) and sends the message to the corresponding module on the bus.

When Monitored
Continuously with the ignition on.

Set Condition
The Steering Column Control Module senses that the Steering Wheel Control Compass/Temperature Switch is in the Set position for greater than 50 seconds.

Possible Causes
- INTERMITTENT STEERING WHEEL CONTROL C/T SWITCH CIRCUIT DTC
- RIGHT STEERING SWITCH
- STEERING COLUMN CONTROL MODULE (SCCM)

Diagnostic Test
1. DTC IS ACTIVE





NOTE: If U1109-LOST COMMUNICATION WITH LIN STEERING WHEEL CONTROLS is set along with this DTC, diagnose the communication DTC first.

NOTE: If P0562-BATTERY VOLTAGE LOW or P0563-BATTERY VOLTAGE HIGH is set along with this DTC, diagnose the battery voltage DTC first.

Ignition on, engine not running.
With the Scan Tool, select View DTCs in the Steering Column Control Module.

Is the DTC status Active at this time?
Yes >> Go to 2
No >> Go to 4
2. RIGHT STEERING SWITCH
Turn the ignition off.
Replace the Right Steering Switch in accordance with the Service Information.
Turn the ignition on.
With the Scan Tool, Clear Stored DTCs in the Steering Column Control Module.
With the Scan Tool, select Data Display and view the Compass/Temperature switch data.
While monitoring the Compass/Temperature switch data, press and release the Compass/Temperature Switch several times.

Does the Compass/Temperature switch data change from Set to Not Set when the switch is pressed and released?
Yes >> Test complete.
No >> Go to 3
3. STEERING COLUMN CONTROL MODULE (SCCM)
View repair.

Repair
Replace the Steering Column Control Module (SCCM) in accordance with the Service Information.
4. INTERMITTENT STEERING WHEEL CONTROL MENU SWITCH CIRCUIT DTC
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?
Yes >> Repair as necessary.
No >> Test complete.