Pinpoint Test D : B10D9:87: Notes

Diagnostic Overview 

Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods .

Refer to Passive Anti-Theft System , Passive Anti-Theft System for schematic and connector information.

Normal Operation and Fault Conditions 

The BCM supplies voltage to the PATS transceiver. When the ignition changes to RUN or START, 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.

BCM DTC Fault Trigger Conditions 

Possible Sources: 

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

Visual Inspection and Diagnostic Pre-checks 

• Verify the BCM fuse 18 (10A) is OK.