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 via the horn supply voltage circuit.

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

CONDITIONS FOR RUNNING THE DTC
The BCM monitors the voltage level on the horn relay control circuit whenever the ignition is in the RUN position.

CONDITIONS FOR SETTING THE DTC
The BCM will set DTC B2750 as current whenever an improper voltage level is detected on the horn relay control circuit, for more than 15 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM will disable the driver for the horn relay control circuit whenever DTC B2750 is set as current.

CONDITIONS FOR CLEARING THE MIL/DTC
DTC B2750 will clear when an improper voltage level is no longer detected on the horn relay control circuit, or when you use a scan tool to clear DTCs.

DIAGNOSTIC AIDS
- Inspect for a sticking horn pad and or switch.
- Perform a visual inspection for loose or poor connections at all related components.

TEST DESCRIPTION

Step 1 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the horn relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the horn relay. The horn fuse supplies power to the coil side of the horn relay.
4. Verifies that the BCM is providing ground to the horn relay.
5. Tests if ground is constantly being applied to the horn relay.