Normal Operation

The Body Control Module (BCM) fuse 18 (10A) supplies voltage to the Passive Anti-Theft System (PATS) transceiver. When the ignition is turned to the RUN or START positions, the BCM  initiates the key interrogation sequence. The BCM  starts the interrogation sequence by generating a signal and sending that signal to the transceiver on the transmit (TX) circuit. When the transceiver receives the signal from the BCM  , it reads the PATS  key and generates a challenge response to the BCM  signal. The transceiver sends the challenge response back to the BCM  on the receive (RX) circuit.

• DTC B10D9:87 (PATS  Transponder: Missing Message) - sets when the BCM  does not receive a response from the PATS  transceiver

This pinpoint test is intended to diagnose the following: 

• Fuse
• Wiring, terminals or connectors
• PATS  transceiver
• BCM