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DTC B3849

DTC B3849

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 Descriptor

DTC B3849 02

Driver Exterior Door Handle Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Driver Door Handle Switch Signal

B3849 02

1

1

-

Passenger Door Handle Switch Signal

B1474 02

1

1

-

Left Rear Door Handle Switch Signal

B1534 02

1

1

-

Right Rear Door Handle Switch Signal

B1534 02

1

1

-

Driver Door Handle Switch Ground

-

1

1

-

Passenger Door Handle Switch Ground

-

1

1

-

Left Rear Door Handle Switch Ground

-

1

1

-

Right Rear Door Handle Switch Ground

-

1

1

-

1. Power Door Latch Malfunction



Circuit/System Description

The driver exterior door handle switch signal circuit provides inputs to the remote control door lock receiver when the driver exterior door handle switch is activated. This input allows the remote control door lock receiver to detect a door open request. The remote control door lock receiver provides voltage to the driver exterior door handle switch via the driver door handle switch signal circuit. When the driver door handle is activated, the switch closes and the voltage signals from the remote control door lock receiver are pulled to ground.

Conditions for Running the DTC

Battery voltage is between 9-16 V.

Conditions for Setting the DTC

The remote control door lock receiver detects the driver exterior door handle switch signal circuit is shorted to ground or closed for more than 180 s.

Action Taken When the DTC Sets

The remote control door lock receiver ignores inputs from the driver exterior door handle switch.

Conditions for Clearing the DTC


• The DTC will be current for as long as the fault is present.

• When the fault is no longer present, the DTC will be a history DTC.

• A history DTC will clear after 50 ignition cycles.


Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Latch 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

Ignition ON, observe the scan tool Exterior Driver Door Handle Switch parameter while using the driver door handle. The parameter should change between Active and Inactive.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the B27A Door Handle Switch - Driver Exterior.

2. Ignition ON, verify the scan tool Exterior Driver Door Handle Switch parameter is Inactive.

3. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K77 Remote Control Door Lock Receiver.

4. Connect the a 3 A jumper harness between the signal circuit terminal 2 and ground. Verify the scan tool Exterior Driver Door Handle Switch parameter is Active.

5. If not the specified value, test the signal circuit terminal 2 for an open/high resistance. If the circuit tests normal, replace the K77 Remote Control Door Lock Receiver.

6. If all circuits test normal, test or replace the B27A Door Handle Switch - Driver Exterior.


Component Testing


Static Test

1. Ignition OFF, disconnect the harness connector at the B27A Door Handle Switch - Driver Exterior.

2. With the switch in the open position, test for infinite resistance between the signal terminal 2 and the ground terminal 1.

3. If not the specified value, replace the B27A Door Handle Switch - Driver Exterior.

4. With the switch in the closed position, test for less than 5 Ω between the signal terminal 2 and the ground terminal 1

5. If greater than the specified range, replace the B27A Door Handle Switch - Driver Exterior.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Side Door Outside Handle Replacement (Base)

• Control Module References for remote control door lock receiver replacement, setup, and programming