Pinpoint Test D: DTC B1602

Anti-Theft

Pinpoint Tests

Pinpoint Test D: DTC B1602

Normal Operation

During each vehicle start sequence, the Passive Anti-Theft System (PATS) transceiver reads the PATS key identification code and sends the data to the Instrument Cluster (IC).

- DTC B1602 (PATS Received Invalid Format of Key-Code From Ignition Key Transponder) - sets when only a partial PATS key was read. Remote starter equipment can also cause this DTC.

This pinpoint test is intended to diagnose the following:

- PATS key
- PATS transceiver
- IC



PINPOINT TEST D: DTC B1602

NOTE: Large metallic objects, 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 may cause a vehicle starting concern 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 off and restart the engine with all other objects on the key ring held away from the ignition key. Check to make sure the PATS key used by the customer is an approved Ford PATS key (PATS keys from Ford, Rotunda, Strattec, and Huf are approved Ford PATS keys).

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D1 RETRIEVE THE DTCs


- NOTE: Follow this procedure using both PATS keys (using one at a time).
- If only one key is available, cut a new key and program the keys. Refer to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment Using Diagnostic Equipment.
- Ignition OFF.
- Connect the scan tool.
- Ignition ON.
- Clear the IC DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the IC DTCs.
- Is DTC B1602 retrieved for one or both PATS keys?

Yes
If DTC B1602 is retrieved for one key, REPLACE that key and PROGRAM the new key. REFER to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. CLEAR the DTCs.
CYCLE the ignition. REPEAT the self-test.

If DTC B1602 is retrieved for both PATS keys, GO to D2.

No
The system is OK. CHECK all the customer PATS keys by attempting to start the vehicle with each key to verify all other PATS keys are programmed.

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D2 INSTALL A NEW PATS TRANSCEIVER


NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IC again.

- Ignition OFF.
- Install a new PATS transceiver. Refer to Passive Anti-Theft System (PATS) Transceiver Service and Repair.
- Ignition ON.
- Clear the IC DTCs.
- Ignition OFF.
- Ignition ON.
- Retrieve the IC DTCs.
- Are any PATS DTCs retrieved?

Yes
GO to D3.

No
The system is OK. CHECK all the customer PATS keys by attempting to start the vehicle with each key to verify all other PATS keys are programmed.

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D3 CHECK FOR CORRECT IC OPERATION


- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new IC. REFER to Instrument Panel, Gauges and Warning Indicators. RESET the parameters in both the IC and the PCM. REFER to Passive Anti-Theft System (PATS) Parameter Reset Passive Anti-Theft System (PATS). PROGRAM the PATS keys into the new IC. REFER to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment Using Diagnostic Equipment. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.

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