2010 Cadillac CTS Sedan AWD V6-3.6L Page 406
The keyless entry control module detects a short to ground in the left rear or right rear door handle signal circuit.
Action Taken When the DTC Sets
The affected door will not unlock when using the exterior rear door handle.
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 (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Door Latch Description and Operation (See: Body and Frame/Locks/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/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 rear door handle or the exterior
right rear door handle. The appropriate door should unlock and unlatch allowing the door to be pulled open.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B27 door handle switch - rear.
2. Test for less than 30ohm between the ground circuit terminal 1 and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, test for greater than 10 V between the signal circuit terminal 2 and ground.
瀚慖f 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.
4. If all circuits test normal, test or replace the B27 door handle switch - rear.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B27 door handle switch - rear.
2. Test for infinite resistance between the signal terminal 2 and the ground terminal 1 with the switch in the open position.
瀚慖f not the specified value, replace the B27 door handle switch - rear.
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 B27 door handle switch - rear.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Rear Side Door Outside Handle Replacement (With ATH) (See: Body and Frame/Doors, Hood and Trunk/Doors/Rear Door/Rear Door
Handle/Rear Door Exterior Handle/Service and Repair/Rear Side Door Outside Handle Replacement (With ATH))Rear Side Door Outside
