B2750

DTC B2750

CIRCUIT DESCRIPTION
The body control module (BCM) controls the horn relay by grounding the control circuit of the horn relay coil. When the horn relay coil is grounded, the horn relay contacts close applying voltage to the horn through the horn supply voltage circuit.

DTC DESCRIPTOR

This diagnostic procedure supports the following DTC:
DTC B2750 Horn Relay Coil Circuit




This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC
The DTC can only set when the output is actively being requested by the CPU.

CONDITIONS FOR SETTING THE DTC
The following condition exists for more than 125 milliseconds:
The DTC will set if the output driver device detects current in excess of its capacity.

ACTION TAKEN WHEN THE DTC SETS
The BCM disables the output to the horn relay until the next ignition cycle.

CONDITIONS FOR CLEARING THE DTC
- The current DTC clears when the fault is no longer present.
- The current DTC will become history when the request for the output is removed.
- The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

TEST DESCRIPTION

Step 1 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies the operation of the horn relay. Listen for an audible click when commanding the horn relay ON and the OFF.
3. This step verifies that voltage is supplied to the coil side of the horn relay. The horn fuse supplies power to the coil side of the horn relay.
4. This step verifies that the BCM is providing ground to the horn relay.