GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 STS 🢒 DTC 🢒 DTC B3062 or B3067

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 Descriptors

DTC B3062 02: Front Door Key Lock Switch Circuit Short to Ground

DTC B3067 02: Front Door Key Unlock Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Door Key Switch Signal

B3062 02, B3067 02

1

1

--

Driver Door Latch Assembly Ground

--

1

--

--

1. Door Lock Key Cylinder Switches Inoperative

Circuit/System Description

The driver door key switch is contained within the driver door latch assembly. The driver door key cylinder switch contacts, which are normally open, receive a constant ground. When the door key is turned to unlock, the switch contacts close and the driver door module (DDM) detects a switched ground. The DDM sends a message via serial data to the remote control door lock receiver (RCDLR), indicating the key cylinder unlock switch request. The RCDLR is the master of all lock and unlock operations. If the RCDLR determines that the key cylinder unlock switch request is valid and conditions are correct for the door modules to perform the unlock function, it sends a message via serial data back to all door modules to unlock all doors.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

The DDM detects that the driver door key cylinder switch is closed for greater than 30 seconds.

Action Taken When the DTC Sets

The DDM ignores inputs from the driver door key cylinder 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
    •  Power Door Locks 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
  1. Ignition ON, command the doors to LOCK and UNLOCK by using the driver door lock switch, all doors should perform the LOCK and UNLOCK functions.
    2. ⇒If any door fails to LOCK or UNLOCK, refer to Power Door Locks Malfunction.
  2. Observe the scan tool Door Cylinder Switch parameters while the turning and holding the key in the driver door lock cylinder to the left and then to the right, parameter should change from Idle to Unlock.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the driver door latch.
  2. Ignition ON, verify the scan tool Door Cylinder Switch parameter is Idle.
    3. ⇒If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the DDM.
    • Right hand drive terminal 4
    • Left hand drive terminal 9
  3. Install a 3A fused jumper wire between the signal circuit terminal listed below and the ground. Verify the scan tool Door Cylinder Switch parameter is Unlock.
    4. • Right hand drive terminal 4
    • Left hand drive terminal 9
    ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.
  4. If all circuits test normal, test or replace the driver door latch.

Component Testing
  1. Ignition OFF, disconnect the harness connector at the driver door latch.
  2. Test for infinite resistance between the terminals listed below with the switch in the Idle position.
    3. • Right hand drive terminals 4 and 3
    • Left hand drive terminals 9 and 8
    ⇒If not the specified value, replace the driver door latch.
  3. Test for less than 2 ohms between the terminals listed below with the switch in the Unlock position.
    4. • Right hand drive terminals 4 and 3
    • Left hand drive terminals 9 and 8
    ⇒If greater than the specified range, replace the driver door latch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Front Side Door Lock Replacement
    •  Control Module References for DDM replacement, setup, and programming