Doors Will Lock Using Transmitter, But Horn Does Not Sound

Using analog voltmeter, backprobe RKE module harness connectors. Measure voltage between terminal No. 6 of Gray connector and ground. See Figure . Monitor voltmeter for voltage decrease while pressing transmitter LOCK button. If no voltage decrease is measured, replace receiver. If voltage decrease is measured, inspect and repair circuit between module and horn relay. See WIRING DIAGRAM  .