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DTC B3120

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 Antenna 2 Short to Ground

DTC B3120 05

Keyless Entry Antenna 2 High Voltage/Open

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Keyless Entry Antenna Signal - Passenger Door B3120 02 B3120 05 B3120 05 -
Keyless Entry Antenna Low Reference - Passenger Door - B3120 05 - -


Circuit/System Description

The passenger front door handle antenna 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 antenna.

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 antenna signal circuit.

B3120 05

The keyless entry control module detects a short to B+ or an open on the passenger front door keyless entry antenna 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 (without ATH) Keyless Entry System Description and Operation (with ATH)

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

Verify DTC B3122, B3123, or B3124 is not set.

Circuit/System Testing


1.
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 antenna harness connector is disconnected. Disconnecting both harness connectors will result in the inability to activate the antenna and cause an improper diagnosis.


Ignition OFF, disconnect the harness connector at the T10N passenger door handle keyless entry antenna.

2. Ignition ON, test for less than 1 V between the signal circuit terminal 1 and ground.

3. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K84 keyless entry control module.

4.
Note

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


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.

5. Activate the antenna by pulling the passenger exterior door handle. Verify the MAX voltage captured by the DMM is greater than 1.0 V.

6. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K84 keyless entry control module.

7. Test for less than 1 V between the low reference circuit terminal 2 and ground.

8. If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K84 keyless entry control module.

9.
Note

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


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.

10. Activate the antenna by pulling the passenger exterior door handle. Verify the MAX voltage captured by the DMM is greater than 1.0 V.

11. If less than the specified range, test the low reference circuit for an open circuit/high resistance. If the circuit tests normal, replace the K84 keyless entry control module.

12.
Note

Install the A24P passenger exterior door handle assembly and verify correct system operation BEFORE painting the assembly. If the assembly does not correct the concern, return the unpainted part.


If all circuits test normal, replace the A24P passenger exterior door handle assembly. Verify DTC B3120 is not set.

13. If the DTC is set, replace the K84 keyless entry control module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Side Door Outside Handle Replacement

• Control Module References for keyless entry control module replacement, setup, and programming