B2752

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION,
The body control module (BCM) controls the horn relay. The BCM grounds the horn relay control circuit in order to activate the horn relay. The BCM also monitors the horn relay control circuit to determine if it is shorted to ground or shorted to voltage.

CONDITIONS FOR RUNNING THE DTC
Voltage supplied to the BCM is in the normal operating range (approximately 9-16 volts).

CONDITIONS FOR SETTING THE DTC
The horn relay control circuit is shorted to ground for 30 seconds.

ACTION TAKEN WHEN DTC SETS
^ The BCM stores DTC B2752 in memory.
^ If the horn relay control circuit is shorted to ground, the horn will sound constantly.
^ If the horn relay control circuit to the BCM is open, the BCM can not control the horn for RFA functions.

CONDITIONS FOR CLEARING THE DTC
A current DTC B2752 clears when the malfunction is no longer present.
^ A history DTC clears after 100 consecutive ignition cycles without a malfunction present.

DIAGNOSTIC AIDS
^ If the DTC is a history DTC, the problem may be intermittent. Try performing the above tests while wiggling the wiring and connectors. This can often cause the malfunction to appear.
^ Check for a sticking horn pad and/or switch.
^ Pressing and holding the horn switch for more than 30 seconds will also set this DTC.
^ Perform a visual check of the wiring and connectors.

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. Tests for voltage at the coil side of the horn relay.
4. Verifies that the body control module and horn switch are providing ground to the horn relay.
5. Tests if ground is constantly being applied to the horn relay.