Keyless Entry Transmitter Lock Function Inoperative

Use a test light and backprobe between keyless entry receiver connector terminal "F" (Light Blue wire) and ground. Observe test light and operate keyless entry transmitter door button. If test light does not flash on once, check for poor connection. If connection is okay, reprogram a known-good transmitter and retest. If lock function remains inoperative, replace keyless entry receiver.
If test light does flash on once, backprobe with test light between power door lock relay connector terminal "A" and ground. While observing test light, operate keyless entry transmitter door button.
If test light does not flash, check wiring for an open circuit. If test light does flash, check Gray wire for an open or short to ground between power door relay terminal "B" and splice.