Circuit Description
When an ignition key is inserted into the ignition lock cylinder, the transponder embedded in the head of the key is energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the theft deterrent control module. The theft deterrent control module then compares this value to a value stored in memory (learned key code). If the value is correct the theft deterrent control module sends the enable password via the serial data circuit to the powertrain control module (PCM).
Conditions for Running the DTC
The ignition switch must be ON. The theft deterrent control module cannot have DTC B1327 set as a current DTC.
Condition for Setting the DTC
The theft deterrent control module is unable to measure the ignition key transponder value. This may be due to a damaged or missing transponder, a non Passkey III (PK3) key, or a damaged exciter.
Action Taken When the DTC Sets
Important: If the theft deterrent control module is unable to measure the ignition key transponder value for 30 consecutive seconds, after the vehicle has started, the theft deterrent control module will enter a fail enable state. The vehicle will not stall or stop running. If the theft deterrent control module is in a fail enable state when the ignition is turned to OFF, it will remain fail enabled until the next time the vehicle is started. If the theft deterrent control module is fail enabled, the VTD system is NOT active and the vehicle will start. The theft deterrent control module WILL send its enable password even if a transponder value is not received. The theft deterrent control module will remain fail enabled until the module measures a valid key transponder value.
| • | The theft deterrent control module sends a class 2 message containing a disable password to the powertrain control module (PCM). |
| • | The vehicle will not start. |
| • | The theft deterrent control module sends a class 2 message to the instrument cluster to illuminate the SECURITY indicator on steady. |
Conditions for Clearing the MIL/DTC
| • | The theft deterrent control module clears the current status of the DTC when it senses a valid, memorized, transponder value from the ignition key. |
| • | The DTC can be cleared by using a scan tool. |
Diagnostic Aids
Refer to Testing for Intermittent Conditions and Poor Connections and Testing for Electrical Intermittents in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
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Verifies the condition for setting DTC B3055 is current.
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The key must be a PASS-KEYIII® transponder key with an operating transponder for the system to work.
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The only method to confirm whether the transponder in the key or the theft deterrent control module is malfunctioning is to try a alternative component in the system. The vehicle was delivered with 2 keys.
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The possibility is unlikely that more than one key will be defective. If all keys do not work, the theft deterrent control module must be malfunctioning.
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If the vehicle has a malfunctioning theft deterrent control module that malfunctioned during an ignition cycle, the system will be "fail enabled" and the vehicle will start for all keys.
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If a new key must be tried, the key must have the proper mechanical cut and the theft deterrent control module must "learn" the transponder value.
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If only one key was available for the vehicle and the replacement key does not work, the theft deterrent control module must be malfunctioning.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views | |||
1 | Did you perform the Theft Deterrent Diagnostic System Check? | Go to Step 2 | |
Is DTC B3055 set as a current code? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
Inspect the vehicle's key for damage to the molded head and for PK3 embossed on the shank. Is the head of the key damaged or missing the PK3 embossing? | Go to Step 8 | Go to Step 4 | |
Are more than one of the vehicles keys available? | Go to Step 5 | Go to Step 7 | |
Do any of the available keys start the vehicle? | Go to Step 6 | Go to Step 7 | |
Do all of the available keys cause DTC B3055 to set? | Go to Step 7 | Go to Step 8 | |
7 | Test the low reference, sensor signal and supply voltage circuits of the theft deterrent control module for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 15 | Go to Step 8 |
Did you complete the replacement? | Go to Step 9 | -- | |
Does the replacement key cause DTC B3055 to set? | Go to Step 10 | Go to Step 15 | |
10 | Inspect for poor connections at the harness connector of the theft deterrent control module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did find and correct the condition? | Go to Step 15 | Go to Step 11 |
11 |
Important: If a 10 Minute or 30 Minute Re-Learn Procedure is perform, all keys not learned at that time will be erased and will not be recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure. Refer to Adding Keys .
Did you complete the replacement? | Go to Step 12 | -- |
12 | Does the replacement module cause DTC B3055 to set? | Go to Step 13 | Go to Step 15 |
13 | Inspect for poor connections at the harness connector of the theft deterrent exciter module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did find and correct the condition? | Go to Step 15 | Go to Step 14 |
14 | Replace the theft deterrent exciter module. Refer to Theft Deterrent Exciter Module Replacement . Did you complete the replacement? | Go to Step 15 | -- |
15 |
Does the DTC reset? | Go to Step 2 | System OK |
