2010 Cadillac CTS Sedan AWD V6-3.6L Page 631

2010 Cadillac CTS Sedan AWD V6-3.6L Page 631

* Ground circuit terminal 4

瀚慖f 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

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 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.

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.

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.

瀚慖f 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 (See: Verification Tests) after completing the diagnostic procedure.

* Front Side Door Outside Handle Replacement (Front and Rear Doors with ATH) (See: Body and Frame/Doors, Hood and

Trunk/Doors/Front Door/Front Door Handle/Front Door Exterior Handle/Service and Repair)Front Side Door Outside Handle Replacement

(Front Door with ATH) (See: Body and Frame/Doors, Hood and Trunk/Doors/Front Door/Front Door Handle/Front Door Exterior

Handle/Service and Repair)Front Side Door Outside Handle Replacement (Without ATH) (See: Body and Frame/Doors, Hood and

Trunk/Doors/Front Door/Front Door Handle/Front Door Exterior Handle/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for driver door lock/window switch and keyless

entry control module replacement, setup, and programming

B3873

DTC B3873

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptor

DTC B3873 00

- Front Washer Relay Circuit

Diagnostic Fault Information