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DTC B3120

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 B3120 02: Keyless Entry Aerial 2 Short to Ground

DTC B3120 05: Keyless Entry Aerial 2 High Voltage/Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Keyless Entry Aerial Signal - Passenger Door

B3120 02

B3120 05

B3120 05

-

Keyless Entry Aerial Low Reference - Passenger Door

-

B3120 05

--

--

Circuit/System Description

The passenger front door handle aerial is located in the passenger front door handle assembly and is used to establish low frequency communications with the keyless entry transmitter. As a vehicle with locked doors is approached with a keyless entry transmitter and the exterior door handle is pulled, the keyless entry control module communicates with the passenger front door handle keyless entry aerial.

Conditions for Running the DTC
    • The touch pad in the passenger front door handle is touched within 15 minutes of the last change of door ajar status for any door.
    • The front or rear door handle on the passenger side is pulled.

Conditions for Setting the DTC

B3120 02

The keyless entry control module detects a short to ground on the passenger front door keyless entry aerial signal circuit.

B3120 05

The keyless entry control module detects a short to B+ or an open on the passenger front door keyless entry aerial signal circuit.

Action Taken When the DTC Sets

Doors will not unlock when front passenger handle is pulled. Doors will not lock with passenger touch pad.

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 40 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Remote Function Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Ignition ON.
  2. Verify that DTC B3122, B3123, or B3124 is not set.
    3. [ARW-LISTFAIL]

  3. If any of the DTCs are set

    Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

    4. [/ARW-LISTFAIL][ARW-LISTPASS]

  4. If none of the DTCs are set

    5. [/ARW-LISTPASS]
  5. Refer to Circuit/System Testing.

Circuit/System Testing

    Note: The A24P passenger exterior door handle assembly has two harness connectors. Of these two harness connectors, make sure that only the T10N passenger door handle keyless entry aerial harness connector is disconnected. Disconnecting both harness connectors will result in the inability to activate the aerial and cause an improper diagnosis.

  1. Ignition OFF, disconnect the harness connector at the T10N passenger door handle keyless entry aerial, ignition ON.
  2. Test for less than 1 V between the signal circuit terminal 1 and ground.
    3. [ARW-LISTFAIL]

  3. If 1 V or greater

    4. [/ARW-LISTFAIL]
    2.1. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module, ignition ON.
    2.2. Test for less than 1 V between the signal circuit and ground.
    [ARW-LISTFAIL]

  4. If 1 V or greater, repair the short to voltage on the circuit.

  5. If less than 1 V, replace the K84 keyless entry control module.

    6. [/ARW-LISTFAIL] [ARW-LISTPASS]

  6. If less than 1 V

    7. [/ARW-LISTPASS]

    Note: When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

  7. Ignition OFF, install a DMM between the signal circuit terminal 1 and ground. Set the DMM to capture DC voltage using the MIN MAX function.
  8. Lock the vehicle doors using the keyless entry transmitter. Activate the aerial by pulling the driver exterior door handle.
  9. Verify the MAX voltage captured by the DMM is greater than 1 V.
    10. [ARW-LISTFAIL]

  10. If 1 V or less

    11. [/ARW-LISTFAIL]
    5.1. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module.
    5.2. Test for infinite resistance between the signal circuit and ground.
    [ARW-LISTFAIL]

  11. If less than infinite resistance, repair the short to ground on the circuit.

    12. [/ARW-LISTFAIL][ARW-LISTPASS]

  12. If infinite resistance

    13. [/ARW-LISTPASS]
    5.3. Test for less than 2 Ω in the signal circuit end to end.
    [ARW-LISTFAIL]

  13. If 2 Ω or greater, repair the open/high resistance in the circuit.

  14. If less than 2 Ω, replace the K84 keyless entry control module.

    15. [/ARW-LISTFAIL] [ARW-LISTPASS]

  15. If greater than 1 V

    16. [/ARW-LISTPASS]
  16. Test for less than 1 V between the low reference circuit terminal 2 and ground.
    17. [ARW-LISTFAIL]

  17. If 1 V or greater

    18. [/ARW-LISTFAIL]
    6.1. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module, ignition ON.
    6.2. Test for less than 1 V between the low reference circuit and ground.
    [ARW-LISTFAIL]

  18. If 1 V or greater, repair the short to voltage on the circuit.

  19. If less than 1 V, replace the K84 keyless entry control module.

    20. [/ARW-LISTFAIL] [ARW-LISTPASS]

  20. If less than 1 V

    21. [/ARW-LISTPASS]

    Note: When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 000.0 V.

  21. Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture DC voltage using the MIN MAX function.
  22. Lock the vehicle doors using the keyless entry transmitter. Activate the aerial by pulling the driver exterior door handle.
  23. Verify the MAX voltage captured by the DMM is greater than 1 V.
    24. [ARW-LISTFAIL]

  24. If 1 V or less

    25. [/ARW-LISTFAIL]
    9.1. Ignition OFF, disconnect the harness connector at the K84 keyless entry control module.
    9.2. Test for less than 2 Ω in the low reference circuit end to end.
    [ARW-LISTFAIL]

  25. If 2 Ω or greater, repair the open/high resistance in the circuit.

  26. If less than 2 Ω, replace the K84 keyless entry control module.

    27. [/ARW-LISTFAIL] [ARW-LISTPASS]

  27. If greater than 1 V

    28. [/ARW-LISTPASS]
  28. Replace the A24D driver exterior door handle assembly.
  29. Lock the vehicle doors using the keyless entry transmitter. Activate the aerial by pulling the driver exterior door handle.
  30. Verify DTC B3120 is not set as current.
    31. [ARW-LISTFAIL]

  31. If DTC B3120 is set as current

    Replace the K84 keyless entry control module.

    32. [/ARW-LISTFAIL][ARW-LISTPASS]

  32. If DTC B3120 is not set or is set as history

    33. [/ARW-LISTPASS]
  33. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Front Side Door Outside Handle Bracket Replacement
    • Control Module References for keyless entry control module replacement, setup, and programming
   


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