With EVIC

B2339-HORN SWITCH STUCK - WITH EVIC





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

Theory of Operation

The horn switch is connected to the Right Steering Wheel Switch. The horn switch status is transferred from the Right Steering Wheel Switch to the Cluster through the Local Interface Network (LIN) bus, a serial sub-bus.

- When Monitored:
Continuously.

- Set Condition:
When the Cluster senses the horn switch input for more than 30 seconds.





1. CHECK FOR AN ACTIVE DTC

NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set.

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

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- 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.

2. CHECK FOR A SHORTED HORN SWITCH





WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Remove the driver airbag.
2. Disconnect the Horn Switch connector.NOTE: Before proceeding, thoroughly inspect the wiring harness and connectors between the horn switch and the Right Steering Wheel Switch. Look for chafed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury.

3. Cycle the ignition switch and then wait 30 seconds.
4. With the scan tool, read the DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

No

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

3. CHECK (X3) HORN SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Right Steering Wheel Switch harness connector.
3. Measure the resistance of the (X3) Horn Switch Sense circuit between ground and the Right Steering Wheel Switch harness connector.

Is the resistance below 10K Ohms?

Yes

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

No

- Go To 4

4. CHECK (X3) HORN SWITCH SENSE CIRCUIT FOR A SHORT TO (Z910) GROUND CIRCUIT, (G907) EVIC/NAV MUX RETURN CIRCUIT, OR TO (X920) RADIO CONTROL MUX RETURN CIRCUIT




1. Disconnect the Clockspring C8 harness connector.
2. Measure the resistance between the (X3) Horn Switch Sense circuit and the (Z910) Ground circuit at the Right Steering Wheel Switch harness connector.
3. Measure the resistance between the (X3) Horn Switch Sense circuit and the (G907) EVIC/NAV MUX Return circuit at the Right Steering Wheel Switch harness connector.
4. Measure the resistance between the (X3) Horn Switch Sense circuit and the (X920) Radio Control MUX Return circuit at the Right Steering Wheel Switch connector.

Is the resistance below 10K Ohms between the (X3) Horn Switch Sense circuit and any of the other circuits?

Yes

- Repair all circuits with a resistance below 10K Ohms for a short to the (X3) Horn Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. CHECK FOR A SHORTED RIGHT STEERING WHEEL SWITCH
1. Replace the Right Steering Wheel Switch.
2. Reconnect the horn switch connector.
3. Turn the ignition on.
4. Using a scan tool, erase the DTCs.
5. Operate the horn switch several times.
6. Cycle the ignition switch.
7. Turn the ignition on and wait 30 seconds.
8. Using a scan tool, read the DTCs.

Does the scan tool display DTC: B2339-HORN SWITCH STUCK?

Yes

- Replace the Right Steering Wheel Switch.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Test complete.
- Perform the BODY VERIFICATION TEST. Body Verification Test.