Captiva

DTC B3060

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is energised by the exciter coils surrounding the ignition lock cylinder. The energised transponder transmits a signal that contains its unique value, which is received by the theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the learned key code. If the value is correct, the TDM will send the pre-release password via the serial data circuit to the engine control module (ECM). If the transponder value does not match the learned key code or a transponder value is not received, the TDM will send the start disable password to the ECM.

Ignition is in the Accessory or Run position.

The transponder value measured by the TDM is incorrect or not learned to the vehicle.

In some instances, RF devices attached to a key chain or otherwise in close proximity of the ignition cylinder may cause interference in the immobiliser system and lead to a no-start condition. Some common RF devices that may be attached to a key chain are Speedpass petrol station payment device, swipe devices used to gain access to locked gates or 24-hour gyms, or other "smart" keys.

These RF devices interfere with the communication between the transponder located in the key and the TDM. The immobiliser systems operates at a frequency of 125 kHz. RF devices that operate in the 120 to 135 kHz range, or a multiplier of these frequencies, are most likely to cause interference. If interference occurs, DTC B3055, B3060, or B3935 may be set.

If interference is suspected, removed the suspect device from the key chain and attempt to start the vehicle. If vehicle starting occurs with the device removed, instruct the customer to remove the device from the key chain to prevent further occurrences. It may also be necessary to inspect all of the customers key chains if the concern is intermittent and doesn't occur with every key.

Schematic Reference

Immobiliser Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobiliser Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Important: 

1. Inspect all available vehicle keys that they are correct vehicle keys.

⇒	If not a correct vehicle key, replace the key.

2. While viewing the scan tool Invalid Key parameter, turn ON the ignition with each of the available vehicle keys. The parameter should read No with all available keys.

⇒	If only one key results in the parameter reading No, replace the appropriate key.

⇒	If all available keys result in the parameter reading No, replace the TDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.