Chart 2 - B2753 - Horn Relay Coil Circuit High

Schematic:

CIRCUIT DESCRIPTION
The Body Control Module (BCM) controls the operation of the horns for the security system and remote keyless entry (RKE) functions. Circuit 28 is grounded by the BCM when horn operation is desired. Normal operation of the horn is performed by the horn switch grounding the horn relay and is not controlled by the BCM.

DTC PARAMETERS
^ Horn operation is requested by BCM
^ Circuit 28 shorted to battery voltage

DIAGNOSTIC AIDS
^ When a shorted-to-battery voltage condition exists in circuit 28 and the BCM requests operation of the horns, the BCM will attempt to switch circuit 28 to ground. High current flow will result and the BCM output will go into a protective state. The BCM output will not allow itself to be activated for as much as 3 minutes.
^ Inspect wiring harness for damage. Check for broken or chafed insulation.
^ Check for poor connection at the rear defrost switch.
^ If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.

TEST DESCRIPTION

Diagnostic Chart: