B2339

B2339-HORN SWITCH STUCK - SCCM





For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

The Horn Switch connects to the Steering Column Control Module (SCCM) via a serial sub-bus called the LIN bus. The SCCM monitors the Horn Switch status. When the switch status changes (switch is pressed or released), the SCCM processes the request and broadcasts it on the CAN B Bus where it is read and processed by the Front Control Module (FCM).

- When Monitored:
Continuously.

- Set Condition:
If the Steering Column Control Module (SCCM) senses that the Horn Switch is in the Set position for more than 50 seconds.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
NOTE: If DTC P0562 BATTERY VOLTAGE LOW or DTC P0563 BATTERY VOLTAGE HIGH is active along with this DTC, diagnose and repair the battery voltage related DTC first.

Turn the ignition on.
With the Scan Tool, select View DTCs in the Steering Column Control Module (SCCM).
Does the scan tool display DTC B2339 HORN SWITCH STUCK active?

Yes

- Go To 2

No

- 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. In addition, wiggle test the wiring and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to set as active during the wiggle test. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. TEST THE HORN SWITCH
Turn the ignition off.
Remove the Driver Airbag.
Disconnect the Horn Switch connector.
Measure the resistance between the (X3) Horn Switch Signal circuit and the (X903) Horn Switch Return circuit in the Horn Switch while pressing and releasing the switch several times.
Does the ohmmeter reading indicate continuity when the switch is pressed and no continuity when the switch is released?

Yes

- Go To 3

No

- Replace the Horn Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

3. CHECK THE (X3) HORN SWITCH SIGNAL CIRCUIT FOR A SHORT TO THE (X903) HORN SWITCH RETURN CIRCUIT




Disconnect the Steering Control Module C3 connector.
Measure the resistance between the (X3) Horn Switch Signal circuit and the (X903) Horn Switch Return circuit in the Horn Switch Connector.
Is the resistance below 10k ohms?

Yes

- Repair the (X3) Horn Switch Signal circuit for a short to the (X903) Horn Switch Return circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To 4

4. CHECK THE (X3) HORN SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (X3) Horn Switch Signal circuit in the Horn Switch Connector.
Is the resistance below 10k ohms?

Yes

- Repair the (X3) Horn Switch Signal circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace the Steering Column Control Module (SCCM).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.