Pinpoint Test B: DTC B10D7:87 or B10D7:8F

Anti-Theft

Pinpoint Tests

Pinpoint Test B: DTC B10D7:87 or B10D7:8F

Normal Operation

When the ignition is turned to the RUN or START position, the Body Control Module (BCM) activates the transceiver to read the key in the ignition. If the BCM does not receive a PATS key code or if the code is invalid, PATS is disabled and the engine does not start.

- DTC B10D7:87 ( PATS Key: Missing Message) - sets when there is no Passive Anti-Theft System (PATS) key read. This DTC sets if a non- PATS key is used to turn the ignition on.
- DTC B10D7:8F ( PATS Key: Erratic) - sets when there is a partial or corrupt PATS key read.

This pinpoint test is intended to diagnose the following:

- PATS key
- PATS transceiver

PINPOINT TEST B: DTC B10D7:87 OR B10D7:8F

NOTE: Large metallic objects or electronic devices on the key ring that can be used to purchase gasoline or similar items, or a second key on the same key ring as the PATS key can cause vehicle starting concerns and record DTCs under certain conditions. If a fault cannot be identified, examine the customer key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the PATS key while starting the engine. These objects and devices cannot damage the PATS key, but can cause a momentary concern if they are too close to the key during engine start. If a concern occurs, turn the ignition switch off and restart the engine with all other objects on the key ring held away from the ignition key.

NOTE: Aftermarket or dealer-installed remote start systems may adversely affect the PATS operation. Disconnect these systems before diagnosing any PATS concerns.

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B1 CHECK THE PATS KEYS

- NOTE: The keys must have "HA" or "SA" stamped on the key blade.

- Check that the correct PATS keys are used with the vehicle. Compare the Integrated Keyhead Transmitters (IKTs) with the one shown in Anti-Theft Anti-Theft - Passive Anti-Theft System (PATS) in the Description and Operation information.
- Are the correct keys being used?

Yes
GO to B2.

No
OBTAIN the correct key(s) for the vehicle. PROGRAM the new key(s). REFER to Key Programming - Program a Key Using Two Programmed Keys Using Two Programmed Keys or Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs. REPEAT the self-test.

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B2 ISOLATE THE PATS KEYS

- NOTE: Follow this procedure using both PATS keys (using one at a time).

- Place a PATS key in the ignition and turn to the RUN position.
- Enter the following diagnostic mode on the scan tool: Clear BCM Continuous DTCs.
- Cycle the ignition from RUN to OFF and then back to the RUN position.
- Enter the following diagnostic mode on the scan tool: BCM Self-Test.
- Is DTC B10D7:87 or B10D7:8F retrieved for both keys?

Yes
INSTALL a new PATS transceiver. REFER to Passive Anti-Theft System (PATS) Transceiver Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
DISCARD the key in question and PROGRAM a new key. REFER to Key Programming - Program a Key Using Two Programmed Keys Using Two Programmed Keys or Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs. REPEAT the self-test.

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