Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B3122 00: Keyless Entry Antenna 4 Performance - Console Active AntennaDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Keyless Entry Antenna Signal - LF Door | B3119 00 | B3119 00 | B3119 00 | -- |
Keyless Entry Antenna Low Reference - LF Door | -- | B3119 005 | -- | -- |
Keyless Entry Antenna Signal - RF Door | B3120 00 | B3120 00 | B3120 00 | -- |
Keyless Entry Antenna Low Reference - RF Door | -- | B3120 005 | -- | -- |
Keyless Entry Antenna Signal - Rear Compartment | B3121 00 | B3121 00 | B3121 005 | -- |
Keyless Entry Antenna Low Reference - Rear Compartment | -- | B3121 00 | -- | -- |
Keyless Entry Antenna Signal - Console Passive | B3123 00 | B3123 00 | B3123 00 | -- |
Keyless Entry Antenna Low Reference - Console Passive | -- | B3123 00 | -- | -- |
Keyless Entry Antenna Ignition - Console Active | B3122 00 | B3122 00 | B3122 00 | -- |
Keyless Entry Antenna Data Signal - Console Active | B3122 00 | B3122 00 | B3122 00 | -- |
Keyless Entry Antenna Clock Signal - Console Active | B3122 00 | B3122 00 | B3122 00 | -- |
Keyless Entry Antenna Low Reference - Console Active | -- | B3122 00 | -- | -- |
Circuit/System Description
The console active antenna is located in the center console and is used to establish low frequency (LF) communications with the keyless entry transmitter The keyless entry console active antenna is only used when the console passive antenna was unable to locate a transmitter within the interior of the vehicle. This may be due to a keyless entry transmitter battery being low or RF/LF interference.
When a valid transmitter is placed into the pocket located in the center console, and either the brake pedal is depressed or the ignition control knob is pressed, the console active antenna broadcasts a challenge to the transmitter. This causes a low frequency coupling to occur between the transmitter and the console active antenna. If the response from the transmitter is a valid response, and all of the security requirements are met, the vehicle's engine will start, or be allowed to go into accessory mode.
Conditions for Running the DTC
The console active antenna is activated
Conditions for Setting the DTC
An internal failure is seen at the console active antenna
Action Taken When the DTC Sets
| • | The security indicator will be illuminated |
| • | The Driver Information Center will display "Service Keyless Start" |
Conditions for Clearing the DTC
| • | A current DTC will clear when the conditions for setting the DTC are no longer present |
| • | A history DTC will clear after 50 malfunction free ignition cycles |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Keyless Entry System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the console active antenna.
- Ignition OFF, test for less than 20 ohms between the low reference circuit terminal 5 and ground.
- Ignition ON, test for B+ between the supply voltage circuit terminal 2 and ground while commanding the scan tool Active Antenna output control ON.
- Ignition OFF, disconnect the X2 harness connector at the RCDLR.
- Ignition ON, verify a test lamp does not illuminate between the following circuits and ground:
- Ignition OFF, test for infinite resistance between the following circuits and ground:
- Test for less than 2 ohms between the following signal circuits:
- If all circuits test normal, test or replace the console active antenna.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the RCDLR. |
| ⇒ | If not the specified value, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RCDLR. |
| • | Signal circuit terminal B |
| • | Signal circuit terminal C |
| ⇒ | If the test lamp illuminates, test the appropriate signal circuit for a short to voltage. |
| • | Signal circuit terminal B |
| • | Signal circuit terminal C |
| ⇒ | If less than the specified value, test the appropriate signal circuit for a short to ground. |
| • | Terminal B at the RCDLR and terminal 3 at the console active antenna |
| • | Terminal C at the RCDLR and terminal 4 at the console active antenna |
| ⇒ | If greater than the specified range, test the appropriate signal circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for RCDLR replacement, setup, and programming |
