Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 56 (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 2005 Buick LaCrosse and 2005 Buick Allure. 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.

2: Listen for an audible click when the A/T shift lock control solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
3: Tests for battery voltage at the control circuit of the A/T shift lock control solenoid.
4: Tests for an open or short to ground at the control circuit of the A/T shift lock control solenoid.
5: Tests for an open at the ground circuit of the A/T shift lock control 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 in Computer/Integrating Systems
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the brake to shift control (if column shift) or console shift BTSI relay (if console shift) output control ON and OFF. With a scan tool, observe the BTSI solenoid (if column shift) or console shift BTSI relay (if console shift) parameter in the body control module (BCM) data list. Does the A/T shift lock control solenoid turn ON and OFF with each command?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Turn OFF the ignition. Disconnect the A/T shift lock control solenoid. 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. Turn ON the ignition, with the engine OFF. With a scan tool, command the brake to shift control (if column shift) or console shift BTSI relay (if console shift) 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 control solenoid for an open or short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 7
5	Test the A/T shift lock control solenoid ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. 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 control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. 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 body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 9
8	Replace the A/T shift lock control solenoid. Refer Automatic Transmission Shift Lock Actuator Replacement . 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 in Computer/Integrating Systems for replacement, setup, and programming.Did you complete the replacement?	Go to Step 10	-
10	Use the scan tool in order to clear the DTCs. 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

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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.