Pinpoint Test B: DTC B1600 - Pats Ignition Key Transponder Signal Is Not Received

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

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 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 key 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, HUF are approved Ford PATS keys).

B1 RETRIEVE THE DTCs
- Key in OFF position.
- Connect the diagnostic tool.
- Key in ON position.
- Clear the IC DTCs.
- Key in OFF position.
- Key in ON position.
- Retrieve the DTCs.
- Is DTC B1600 retrieved?
1. YES : Go to B2.
2. NO : If DTCs other than PATS DTCs are retrieved, REFER to MULTIFUNCTION ELECTRONIC MODULES article.
  If no DTCs are retrieved, the system is OK.
B2 CHECK BOTH PATS KEYS
NOTE: Make sure the new PATS keys are approved Ford encoded PATS keys. Unapproved PATS keys do not always operate correctly over various temperature ranges (PATS keys from Ford, Rotunda, Strattec, HUF are approved Ford PATS keys).
- Obtain both PATS keys from the customer and follow the procedure using one PATS key, then the other. If the customer only has one PATS key, it will be necessary to cut a new PATS key.
- If it is necessary to cut a new PATS key, program the new PATS key. Refer to Key Programming Using Diagnostic Equipment .
- Key in ON position.
- Clear the instrument cluster (IC) DTCs.
- Key in OFF position.
- Key in ON position.
- Retrieve the IC DTCs.
- Using all existing keys, then the newly programmed key, is DTC B1600 present?
1. YES : If DTC B1600 was present for all keys, go to B3.
  If DTC B1600 was not present for all keys, the key may be damaged and should be replaced. CUT a new key to replace the damaged key. REFER to Key Programming Using Diagnostic Equipment . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
2. NO : If DTCs other than PATS DTCs are retrieved, REFER to MULTIFUNCTION ELECTRONIC MODULES article.
  If no DTCs are retrieved, the system is OK.
B3 INSTALL A NEW PATS TRANSCEIVER
NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IC again.

NOTE: Do not use the PATS key that may have been programmed in Step B2.
- Key in OFF position.
- Install a new PATS transceiver. Refer to Passive Anti-Theft System (PATS) Transceiver .
- Key in ON position.
- Clear the IC DTCs.
- Key in OFF position.
- Key in ON position.
- Retrieve the IC DTCs.
- Is DTC B1600 retrieved?
1. YES : Go to B4.
2. NO : The system is OK.
B4 CHECK FOR CORRECT IC OPERATION
NOTE: When a new IC is installed, the PATS keys must be programmed into the IC.

NOTE: When a new IC is installed, the parameters must be reset in both the IC and the PCM.
- Disconnect all the IC connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the IC connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new IC. REFER to INSTRUMENT CLUSTER (IC) AND WARNING CHIMES article. RESET the parameters in the IC and the PCM. REFER to Passive Anti-Theft System (PATS) Parameter Reset . PROGRAM the PATS keys into the new IC. REFER to Key Programming Using Diagnostic Equipment . CYCLE the ignition. REPEAT the self-test.
2. 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.