B1600

Code

Other B — Body

PATS Ignition Key Transponder Signal Is Not Received

Brand: Other

Type: B — Body

Views: UK: 36 EN: 59 RU: 37

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Page language: EN

Use a scan tool to read B1600 and any related security data or freeze frames
Verify vehicle security/immobilizer lamp state during key turn to ON and crank positions
Try all known good keys (including spare) to see if any key is recognized
Inspect ignition lock cylinder and antenna ring for visible damage or loose/missing parts
Check power and ground at the theft‑deterrent module and connectors for corrosion or looseness
Look for recent work, battery disconnects, or aftermarket installs that coincide with fault appearance

Key transponder responds on a low‑frequency RFID band (typical LF reader ~125 kHz; specific frequency is manufacturer‑dependent)
Transponder signal contains an encoded digital ID; reader expects a valid programmed ID
Reader/antenna is passive; power for the immobilizer module is typically vehicle 12 V supply and ground
Communication between immobilizer module and ECM/BCM is via vehicle bus or dedicated serial link (check for normal bus messages)

Retrieve all security-related codes with a capable scan tool; note freeze frame and time stamps.
Verify symptom: turn ignition to ON and observe security lamp behavior and any CAN/bus messages indicating key not found.
Try known good/spare keys. If a spare key works, suspect primary key transponder failure or programming issue.
Visually inspect the ignition cylinder/antenna ring assembly for damage and check connectors at the antenna and theft‑deterrent module for corrosion, bent pins, or loose wires.
With scan tool, monitor the immobilizer/BCM for the transponder ID read event while a key is turned. If no ID event, test antenna ring continuity and wiring to module per service manual.
Check module power/ground and communication lines (CAN or serial) for proper voltages and message traffic; repair any wiring faults.
If antenna and wiring are good but no key ID is received, try reprogramming or re-learning keys per manufacturer procedure — ensure tool supports PATS.
If reprogramming fails or module shows internal faults, replace the theft‑deterrent module or antenna assembly following dealer/ OEM instructions and reprogram keys.
After repairs, clear codes and verify that all keys are learned and that the vehicle starts reliably; recheck for stored security codes.

Key transponder chip failed or key is not the programmed spare
Damaged antenna ring or wiring at the ignition switch
Corroded/loose connectors at PATS/BCM or ignition switch harness
Theft-deterrent module lost its learned key IDs after battery disconnect or replacement
Aftermarket alarm/remote starter interfering with transponder communication