B2752

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The body control module (BCM) can control the horn relay. The keyless entry system may be customized to tell the BCM to sound the horn. The theft deterrent system may also tell the BCM to sound the horn. The BCM does this by grounding the horn relay control circuit.

CONDITIONS FOR RUNNING THE DTC
The body control module must not be commanding the horn relay to energize.

CONDITIONS FOR SETTING THE DTC
The BCM detects a short to ground in the horn relay control circuit.
^ The condition above must be present for more than 0.3 seconds.

ACTION TAKEN WHEN THE DTC SETS
The BCM stores DTC B2752 in memory.

CONDITIONS FOR CLEARING THE DTC
^ A short to ground in the horn relay control circuit is no longer detected by the BCM.
^ A history DTC B2752 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ A scan tool may be used in order to clear the DTC.

DIAGNOSTIC AIDS
If the DTC B2752 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground in the horn relay control circuit
- The horn relay coil is shorted to ground internally
- The BCM is shorted to ground internally

TEST DESCRIPTION
The number(s) below refer to the step number(s) 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. This step 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. This step verifies that the body control m is providing ground to the horn relay.
5. This step tests if ground is constantly being applied to the horn relay.