B148A

B148A-STEERING WHEEL CONTROL MENU SWITCH CIRCUIT





For a complete wiring diagram Refer to Diagrams/Electrical. Electrical Diagrams


Theory of Operation


The Steering Wheel Control Menu Switch is part of the Right Steering Switch. The switching status is transferred to the Steering Control Module (SCM) by way of the LIN bus, a serial sub-bus. The SCM 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 Control Module senses that the Steering Wheel Control Menu Switch is in the Set position for greater than 50 seconds.








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 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.

Turn the ignition on.

Press and release the Menu Switch several times.

With the Scan Tool, Clear Stored DTCs in the Steering Control Module.

With the Scan Tool, select Data Display and view the Menu switch data.

While monitoring the Menu switch data, press and release the Menu Switch several times.

Does the Menu switch data change from Set to Not Set when the switch is pressed and released?

Yes

- Test complete.

No

- Go to 3



3. STEERING CONTROL MODULE (SCM)

View repair.



Repair

- Replace the Steering Control Module (SCM).



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.