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 04: Keyless Entry Antenna 4 Performance Open CircuitDTC B3122 3B: Keyless Entry Antenna 4 Performance Internal Self Test Failed
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Keyless Entry Antenna - Signal (4) | B3119 02 | B3119 05 | B3119 05 | -- |
Keyless Entry Antenna - Low Reference (4) | -- | B3119 05 | -- | -- |
Keyless Entry Antenna - Signal (5) | B3120 02 | B3120 05 | B3120 05 | -- |
Keyless Entry Antenna - Low Reference (5) | -- | B3120 05 | -- | -- |
Keyless Entry Antenna - Signal (3) | B3121 02 | B3121 05 | B3121 05 | -- |
Keyless Entry Antenna - Low Reference (3) | -- | B3121 05 | -- | -- |
Keyless Entry Antenna - Signal (2) | B3123 02 | B3123 04 | B3123 04 | -- |
Keyless Entry Antenna - Low Reference (2) | -- | B3123 04 | -- | -- |
Keyless Entry Antenna - Signal (1) | B3123 02 | B3123 04 | B3123 04 | -- |
Keyless Entry Antenna - Low Reference (1) | -- | B3123 04 | -- | -- |
Keyless Entry Active Antenna Supply Voltage | B3122 04 | B3122 04 | B3122 04 | -- |
Keyless Entry Active Antenna Data Signal | B3122 04 | B3122 04 | B3122 04 | -- |
Keyless Entry Active Antenna Clock Signal | B3122 04 | B3122 04 | B3122 04 | -- |
Keyless Entry Active Antenna Low Reference | -- | B3122 04 | -- | -- |
Circuit/System Description
The console active antenna is located in the center console and is used as a short range low frequency (LF) antenna. The keyless entry console active antenna is only used when a keyless entry transmitter battery is low or there is a interruption with the frequency transmission of the passive antennas located in the console and headliner. When a valid transmitter is placed into the fob pocket, the brake pedal is depressed, and the ignition button 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
A transmitter validation from the console active antenna is requested.
Conditions for Setting the DTC
An improper voltage level is seen at the console active antenna.
Action Taken When the DTC Sets
The console active antenna is ignored.
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 of resistance 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 of resistance 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 |
