With UHA/UHF
DTC B3849 (With UHA/UHF)
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 Descriptor
DTC B3849 00
- Exterior Door Handle Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The exterior door handle switch signal circuit provides inputs to their respective door lock/window switch and to the keyless entry control module when the exterior door handle switch is activated. This input allows the door lock/window switch and the keyless entry control module to detect a door open request. The door lock/window switch and the keyless entry control module provides voltage to the exterior door handle switch via the front door handle switch signal circuit. When the front door handle is activated, the switch closes and the voltage signals from the door lock/window switch and 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
The keyless entry control module detects the driver exterior door handle switch signal circuit is shorted to ground or closed for greater than 180 seconds.
Action Taken When the DTC Sets
The keyless entry control module 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 (Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Power Door Latch Description and Operation (Description and Operation)
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 (Programming and Relearning) for scan tool information
Circuit/System Verification
With the doors closed and locked, approach the vehicle with the keyless entry transmitter and pull the exterior left front door handle. The driver door should unlock and unlatch allowing the door to be pulled open.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B27D door handle switch-driver.
2. Test for less than 30ohm between the ground circuit terminal listed below and ground.
* Ground circuit terminal 1
* Ground circuit terminal 4
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Disconnect the X1 harness connector at the K48 keyless entry control module.
4. Ignition ON, test for greater than 10 V between the signal circuit terminal listed below and ground.
* Signal circuit terminal 2
* Signal circuit terminal 3
• 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 S84D door lock/window switch-driver.
5. Ignition OFF, connect the X1 harness connector at the K48 keyless entry control module and disconnect the X6 harness connector at the S84D door lock/window switch-driver.
6. Ignition ON, test for greater than 10 V between the signal circuit terminal 2 and ground.
• 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 K48 keyless entry control module.
7. If all circuits test normal, test or replace the B27D door handle switch-driver.
Component Testing
1. Ignition OFF, disconnect the harness connector at the B27D door handle switch-driver.
2. Test for infinite resistance between the signal terminal 2 and the ground terminal 1 with the switch in the open position.
• If not the specified value, replace the B27D door handle switch-driver.
3. Test for less than 2 ohm between the signal terminal 2 and the ground terminal 1 with the switch in the closed position.
4. If greater than the specified range, replace the B27D door handle switch-driver.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Outside Handle Replacement (Front and Rear Doors with ATH) (Service and Repair)Front Side Door Outside Handle Replacement (Front Door with ATH) (Service and Repair)Front Side Door Outside Handle Replacement (Without ATH) (Service and Repair)
* Control Module References (Programming and Relearning) for driver door lock/window switch and keyless entry control module replacement, setup, and programming