B2332

B2332-HORN SWITCH INPUT CIRCUIT/PERFORMANCE







Theory of Operation

The Horn Switch is connected to 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 SCM senses that Horn Switch is in the Set position for greater than 50 seconds.





1. CHECK FOR BATTERY VOLTAGE LOW OR HIGH DIAGNOSTIC TROUBLE CODES (DTCs) IN THE POWERTRAIN CONTROL MODULE (PCM)
1. Turn the ignition on.
2. Using a scan tool, read PCM DTCs.

Does the scan tool display P0562-BATTERY VOLTAGE LOW or P0563-BATTERY VOLTAGE HIGH?

Yes

- Diagnose and repair the DTC. Testing and Inspection for the appropriate diagnostic procedure.

No

- Go To 2

2. TEST FOR AN INTERMITTENT CONDITION
1. Using a scan tool, record and erase SCM DTCs.
2. Press and release the horn switch several times and then wait one minute before proceeding.
3. Using a scan tool, read SCM DTCs.

Does the scan tool display B2332-HORN SWITCH INPUT CIRCUIT/PERFORMANCE?

Yes

- Go To 3

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

3. CHECK FOR A SHORTED HORN SWITCH




1. Turn the ignition off.
2. Remove the Driver Airbag.
3. Disconnect the Horn Switch harness connector.
4. Turn the ignition on.
5. Using a scan tool, erase SCM DTCs and then wait one minute before proceeding.
6. Using a scan tool, read SCM DTCs.

Does the scan tool display B2332-HORN SWITCH INPUT CIRCUIT/PERFORMANCE?

Yes

- Go To 4

No

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

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




1. Turn the ignition off.
2. Disconnect the Right Steering Switch harness connector.

NOTE: Before proceeding, thoroughly inspect the wiring harness and connectors between the Horn Switch and the Right Steering Switch for a short to ground or any other circuit.

3. Measure the resistance between the (X3) Horn Switch Signal circuit and the (X903) Horn Switch Return circuit at the Horn Switch harness 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 the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

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




1. Measure the resistance of the (X3) Horn Switch Signal circuit between ground and the Horn Switch harness connector (include the metal casing at the back side of the Airbag).

Is the resistance below 10K Ohms?

Yes

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

No

- Go To 6

6. CHECK (X3) HORN SWITCH SIGNAL CIRCUIT FOR A SHORT TO (D501) LIN SLAVE RETURN CIRCUIT OR TO (G907) EVIC/NAV MUX RETURN CIRCUIT




1. Measure the resistance between the (X3) Horn Switch Signal circuit and the (D501) LIN Slave Return circuit at the Right Steering Switch harness connector.
2. Measure the resistance between the (X3) Horn Switch Signal circuit and the (G907) EVIC/NAV MUX Return circuit at the Right Steering Switch harness connector.

Is the resistance below 10K Ohms for either measurement?

Yes

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

No

- Go To 7

7. CHECK FOR A SHORTED RIGHT STEERING SWITCH
1. Replace the Right Steering Switch.
2. Reconnect the Horn Switch harness connector.
3. Turn the ignition on.
4. Using a scan tool, erase SCM DTCs.
5. Press and release the Horn Switch several times and then wait one minute before proceeding.
6. Using a scan tool, read SCM DTCs.

Does the scan tool display B2332-HORN SWITCH INPUT CIRCUIT/PERFORMANCE?

Yes

- Replace the Steering Control Module (SCM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Perform the BODY VERIFICATION TEST. Body Verification Test.