Vehicle Access
DTC B1474 or B3849
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1474 02
- Passenger Exterior Door Handle Switch Circuit Short to Ground
DTC B3849 02
- Driver Exterior Door Handle Switch Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The exterior door handle switch signal circuits provide inputs to the Keyless Entry Control Module when the exterior door handle switches are activated. These inputs allow the Keyless Entry Control Module to detect a door lock or a door unlock request. The Keyless Entry Control Module provides a 12 V signal to each exterior door handle switch via the door handle switch signal circuits. When a door handle switch is pressed, the switch closes and the voltage signals from the Keyless Entry Control Module are pulled to ground.
Conditions for Running the DTC
Battery voltage is between 9-16 V.
Conditions for Setting the DTC
B1474 02
The Keyless Entry Control Module detects the passenger exterior door handle switch signal circuit is shorted to ground or closed for greater than 180 seconds.
B3849 02
The Keyless Entry Control Module detects the driver exterior door handle switch signal circuit is shorted to ground or closed for more than 180 seconds.
Action Taken When the DTC Sets
The Keyless Entry Control Module will ignore input from the affected door switch and the doors will not lock or unlock when the affected door handle switch is pressed.
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 40 ignition cycles.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Description and Operation
Keyless Entry System Description and Operation (without BTM) Keyless Entry System Description and Operation (without BTM)Keyless Entry System Description and Operation (with BTM) Keyless Entry System Description and Operation (with BTM)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool Exterior Driver Door Handle Switch or the Exterior Passenger Door Handle Switch parameters changes between Active and Inactive when pressing and releasing the B27D Door Handle Switch-Driver Exterior or the B27P Door Handle Switch-Passenger Exterior.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
3. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate B27 Door Handle Switch-Exterior. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Exterior Door Handle Switch parameter is Inactive.
• If not Inactive
1. Ignition OFF, disconnect the harness connector at the K84 Keyless Entry Control Module.
2. Test for infinite resistance between the signal circuit terminal 3 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K84 Keyless Entry Control Module.
• If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 4.
6. Verify the scan tool Exterior Door Handle Switch parameter is Active.
• If not Active
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K84 Keyless Entry Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K84 Keyless Entry Control Module.
• If Active
7. Test or replace the B27 Door Handle Switch-Exterior.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B27 Door Handle Switch-Exterior.
2. Test for infinite resistance between the signal terminal 3 and the ground terminal 4 with the switch in the open position.
• If less than infinite resistance
Replace the B27 Door Handle Switch-Exterior.
• If infinite resistance
3. Test for less than 5 ohms between the signal terminal 3 and the ground terminal 4 with the switch in the closed position.
• If 5 ohms or greater
Replace the B27 Door Handle Switch-Exterior.
• If less than 5 ohms
4. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Outside Handle Replacement Front Side Door Outside Handle Replacement
* Control Module References Control Module References for Keyless Entry Control Module replacement, programming and setup