Diagnosis And Testing - Horn Relay

The hard wired inputs and outputs of the horn relay within the front Power Distribution Center (PDC) may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the Body Control Module (BCM) or the electronic controls and communication between modules and other devices that provide some features of the BCM-controlled horn relay. The most reliable, efficient and accurate means to diagnose the BCM or the electronic controls and communication related to BCM-controlled horn relay operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.