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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1631 (Anti-Theft System - Passive Anti-Theft System (Pats)) >> Diagnostic Tests >> Anti-Theft >> Pinpoint Tests >> Pinpoint Test E: DTC B1681 - PATS Transceiver Module Signal Is Not Received >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

The passive anti-theft system (PATS) transceiver receives voltage from the smart junction box (SJB) fuse 36 (5A) on circuit CBP36 (BU/BN) and is grounded on circuit GD111 (BK/BU). The PATS transceiver and the instrument cluster (IC) communicate on circuits VRT24 (YE/OG) and VRT23 (VT/GY). The IC compares the key code stored in memory and sends a signal to the PCM to enable the starter and the fuel injectors if the key code is correct.

DTC B1681 sets when the PATS transceiver signal is not received by the IC. This DTC can be caused by circuits between the PATS transceiver and the IC, or circuits to the PATS transceiver. This can also be caused by using the incorrect PATS transceiver part number.

This pinpoint test is intended to diagnose the following:

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