B2335-15

B2335-15-HORN CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN





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

Theory of Operation

The Body Control Module (BCM) receives the network communication message from the Steering Control Module indicating horn operation is requested. The BCM provides a voltage output through the horn relay control circuit, which connects to the coil side of the Horn Relay.

- When Monitored:
With the ignition on.

With the Horn off.

- Set Condition:
When the Body Control Module (BCM) detects a high condition on the (X4) Horn Relay Control circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn the ignition off.
4. Turn the ignition on.
5. With the scan tool, read DTCs.

Does the scan tool display DTC: B2335-15-HORN CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN?

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

2. CHECK THE HORN RELAY FOR CORRECT OPERATION
1. Turn the ignition off.
2. Remove the Horn Relay and substitute it with a known good relay.
3. Turn the ignition on.
4. With the scan tool, read DTCs.

Does the scan tool display DTC: B2335-15-HORN CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN?

Yes

- Go To 3

No

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

3. CHECK THE (X4) HORN RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Remove the Horn Relay.
3. Disconnect the BCM A harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (X4) Horn Relay Control circuit.

Is there any voltage present?

Yes

- Repair the short to voltage in the (X4) Horn Relay Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK THE (X4) HORN RELAY CONTROL CIRCUIT FOR AN OPEN
1. Measure the resistance of the (X4) Horn Relay Control circuit between the Horn Relay and the BCM A harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Replace the Body Control Module (BCM). Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the open in the (X4) Horn Relay Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.