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HOMESERVICE MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 220 (SHIFT INTERLOCK SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2705TEST DESCRIPTION
2006 Buick Terraza CXL, 3.5 L, AWD

Test Description

2006 Buick Terraza CXL, 3.5 L, AWDSECTION Test Description
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Listen for an audible click when the A/T shift lock solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  This step tests for battery voltage at the control circuit of the A/T shift lock solenoid.
  3. 4:  This step tests for an open or short to ground at the control circuit of the A/T shift lock solenoid.
  4. 5:  This step tests for an open at the ground circuit of the A/T shift lock solenoid.
DTC B2705

Step Action Yes No
Schematic Reference: Automatic Transmission Shift Lock Control Schematics 
Connector End View Reference: Automatic Transmission Shift Lock Control Connector End Views  or Computer/Integrating Systems Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the shift lock solenoid output control ON and OFF.
  4. With a scan tool, observe the shift lock solenoid command parameter in the body control module (BCM) data list.
Does the A/T shift lock solenoid turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the A/T shift lock solenoid.
  3. Connect a test lamp between the shift lock solenoid control circuit at the connector of the A/T shift lock solenoid and a good ground.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, command the shift lock solenoid output control ON and OFF several times.
Does the test lamp illuminate ON and OFF with each command?		 Go to Step 5  Go to Step 4 
4  Test the control circuit of the A/T shift lock solenoid for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 10  Go to Step 7 
5  Test the A/T shift lock solenoid ground circuit for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 10  Go to Step 6 
6 Inspect for poor connections at the harness connector of the A/T shift lock solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 10  Go to Step 9 
8 Replace the A/T shift lock actuator. Refer to Automatic Transmission Shift Lock Actuator Replacement (Floor Shift)  or Automatic Transmission Shift Lock Actuator Replacement (Column Shift) .
Did you complete the replacement?		 Go to Step 10  -
9
IMPORTANT: Perform the set up procedures for the BCM.
Replace the BCM. Refer to Control Module References for replacement, setup, and programming.Did you complete the replacement?		 Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.